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1
Niu, Zhi Rong, Hou Ren Xiong, Zong Min Yu, Yi Xiang, and Yi Ying Luo. "Monitoring and Analysis on Temperature for External Foam Glass Thermal Insulating System on Walls under Weathering Test." Applied Mechanics and Materials 71-78 (July 2011): 3918–24. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.3918.
Анотація:
The external foam glass thermal insulating system on walls has become a new thermal insulation wall system in china's building wall, It is green energy - saving building wall product with good prospect and used for wall thermal insulation of building. In this paper, real-time monitoring with thermal sensor and analysis on temperature for external foam glass thermal insulating system on walls by weathering test in Jiaxing area, and study on temperature distribution for each layer of walls. The experiment showed that, the external foam glass thermal insulating system on walls caused by foam glass insulation layer of adiabatic effect, Interface layer and thermal insulation layer of temperature difference between change significantly, existing 50 °C, which can cause greater temperature stress, and have certain effect of durability for external foam glass thermal insulating system on walls.
2
Thie, Conal, Sean Quallen, Ahmed Ibrahim, Tao Xing, and Brian Johnson. "Study of Energy Saving Using Silica Aerogel Insulation in a Residential Building." Gels 9, no. 2 (January 19, 2023): 86. http://dx.doi.org/10.3390/gels9020086.
Анотація:
Energy consumption, specifically in the building sector, is expected to rise. One potential way to reduce energy consumption, or to slow this increase, is to reduce the heat loss in residential homes. Silica aerogels have grown in popularity as an insulating material due to their extremely low thermal conductivity. However, the benefits of using silica aerogels as an insulator in residential buildings have not been thoroughly studied. To understand the benefits of using silica aerogels as a thermal insulator in residential homes, experimentally validated simulations were performed. The simulations were performed on a model of a full-scale residential house using the multiphysics software ANSYS FLUENT 2019 R2. The simulations helped predict the actual saving benefits of using aerogels as an insulator. Aerogels have the potential to be used as an insulator in both the walls and windows due to its semitransparency. The results showed that the average kWh savings using one half-inch layer of wall aerogel insulation coupled with window aerogel insulation was 20.9% for the single-family house compared to traditional insulation. On average, the energy lost through the windows was 39.1% lower when using aerogel insulation compared to standard insulating materials. The energy lost through the house walls was 13.3% lower on average when using a thin layer of aerogel insulation. While a thin layer of aerogel insulation provided a benefit when used in the house walls, the potential for savings per quantity used was greater in the windows.
3
Gu, Qian, Yue Wang, Bin Tan, and Sheng Ren. "Analysis of Heat Transfer by Thermal Bridge of Corner Wall in a New Glass Regenerated Pumice External Wall System." Applied Mechanics and Materials 291-294 (February 2013): 954–59. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.954.
Анотація:
This paper was based on heat insulating members made by a new type of waste glass regenerative pumice, with the characteristics of light weight, permeable water retention, ventilation, heat insulation, fire retardant, etc. In the external wall heat insulating system of building envelops, the thermal bridge of external wall corner was simulated with ANSYS. The temperature field and flux field distribution will be shown respectively of non-insulation, self-insulation, internal insulation and external insulation. Through comparing the heat preservation of different insulation forms, the external insulation was better than internal insulation and self-insulation. Besides, considering the imperfection of calculating the wall average heat transfer coefficient in current energy saving standards, a simplified method was presented to calculate the linear heat transmission coefficient with ANSYS. The two coefficients were compared to serve the latest research.
4
Keerthan, Poologanathan, and Mahen Mahendran. "Thermal Performance of Load Bearing Cold-formed Steel Walls under Fire Conditions using Numerical Studies." Journal of Structural Fire Engineering 5, no. 3 (August 19, 2014): 261–90. http://dx.doi.org/10.1260/2040-2317.5.3.261.
Анотація:
Cold-formed Light gauge Steel Frame (LSF) wall systems are increasingly used in low-rise and multi-storey buildings and hence their fire safety has become important in the design of buildings. A composite LSF wall panel system was developed recently, where a thin insulation was sandwiched between two plasterboards to improve the fire performance of LSF walls. Many experimental and numerical studies have been undertaken to investigate the fire performance of non-load bearing LSF wall under standard conditions. However, only limited research has been undertaken to investigate the fire performance of load bearing LSF walls under standard and realistic design fire conditions. Therefore in this research, finite element thermal models of both the conventional load bearing LSF wall panels with cavity insulation and the innovative LSF composite wall panel were developed to simulate their thermal behaviour under standard and realistic design fire conditions. Suitable thermal properties were proposed for plasterboards and insulations based on laboratory tests and available literature. The developed models were then validated by comparing their results with available fire test results of load bearing LSF wall. This paper presents the details of the developed finite element models of load bearing LSF wall panels and the thermal analysis results. It shows that finite element models can be used to simulate the thermal behaviour of load bearing LSF walls with varying configurations of insulations and plasterboards. Failure times of load bearing LSF walls were also predicted based on the results from finite element thermal analyses. Finite element analysis results show that the use of cavity insulation was detrimental to the fire rating of LSF walls while the use of external insulation offered superior thermal protection to them. Effects of realistic design fire conditions are also presented in this paper.
5
Bedov, Anatoly, Azat Gabitov, Askar Gaysin, and Alexander Salov. "Engineering solutions for heart efficient exterior walls in climatic condition of the Republic of Bashkortostan." E3S Web of Conferences 97 (2019): 02039. http://dx.doi.org/10.1051/e3sconf/20199702039.
Анотація:
Problems and disadvantages of some technical solutions concerning modern heat efficient exterior walls are considered herein under experience of engineering, construction and operation of residential and civil buildings in the Republic of Bashkortostan. Special attention is paid to defects in engineering and erection of three-layer walls, and functioning principles of all components of the wall are strictly fixed. Recommendation to increase maintenance-free service life by meeting special engineering requirements are given herein. Effect to increase buildings heat insulation is achieved by: reducing heat loss through separate enclosing structures and heat insulating shells of the building thereby enabling to reduce thermal power requirements; improving heat acceptability in rooms by decreasing rate of radiative and convective heat exchange in outer surface of enclosures; reducing environmental pollution due to air emissions reduction. Exterior wall insulation is the important element of the building heat balance. Many researchers in this field currently focus on analysis of series of residential buildings with different number of storeys made by engineering solutions for exterior walls to increase heat homogeneity thereof. Subject: main engineering solutions for heat efficient exterior walls. Objectives: three-layer wall constructed of masonry units; exterior three-layer wall within 121u panel series; three-layer wall of “Ventilated façade” system; façade heat insulation with plaster on lath; wall made of load-bearing structural insulating materials. Materials and methods: calculation of reduced total thermal resistance in exterior walls. Results: one of the most efficient methods to meet specific heat-shielding performance requirements is to increase heat homogeneity of the exterior wall. Conclusions: in the short term structural components of three-layer exterior walls are to be upgraded according to construction rules and regulations SNiP 23-02-2003 “Buildings Heat Insulation” thereby enabling the engineering solutions to meet the appropriate norms and rules.
6
Deng, Jun-Xi, Xiao Li, Xiao-Juan Li, and Tai-Bing Wei. "Research on the Performance of Recycled-Straw Insulating Concrete and Optimization Design of Matching Ratio." Sustainability 15, no. 12 (June 15, 2023): 9608. http://dx.doi.org/10.3390/su15129608.
Анотація:
Construction solid waste and agricultural waste, as renewable resources, have gained increasing attention recently. This research aims to explore the mechanical and thermal properties of recycled-straw insulating concrete commonly made with construction waste and straw in northern Fujian, which can provide useful suggestions for the practical use of recycled-straw insulating concrete. The effects of recycled coarse aggregate, fly ash, and straw on the mechanical and thermal properties of recycled-straw insulating concrete were investigated by orthogonal tests. The results of the orthogonal tests were optimized by the total efficacy coefficient method to obtain the optimal mix ratio of recycled-straw insulating concrete. Combined with the finite element analysis software ANSYS Workbench, the heat transfer performance of the recycled-straw insulating concrete walls was analyzed to simulate the insulation performance of the walls. The compressive strength of the recycled-straw insulating concrete with the optimal ratio was found to be 30.93 MPa, and the thermal conductivity was 0.5051 W/(m·K). The steady-state thermal analysis of the recycled-straw insulating concrete wall and the plain concrete wall was carried out by finite element software, and the simulation results showed that the insulation performance of the recycled-straw insulating concrete walls was improved by 145% compared with the plain concrete wall. These results indicate that the recycled-straw insulating concrete wall has better thermal insulation performance and can be applied to building envelopes to save heating costs in winter and reduce carbon dioxide emissions, which has significant economic and environmental significance for areas with low outdoor temperatures in winter and long heating periods.
7
Ornam, Kurniati, Surjamanto Wonorahardjo, Sugeng Triyadi, and Masykur Kimsan. "Thermal Behaviour and Micro Climate Studies of Several Wall Insulation on Houses in a Tropical Climate (Aw) Area." IOP Conference Series: Earth and Environmental Science 1058, no. 1 (July 1, 2022): 012019. http://dx.doi.org/10.1088/1755-1315/1058/1/012019.
Анотація:
Abstract Standard brick walls have caused a gradual increase in the area’s temperature due to the bricks’ emissivity. Therefore, several effective technologies to overcome this problem have been proposed, one of which is thermal insulation by covering the outer walls of bricks from exposure to sunlight. This study compares thermal insulation effectiveness with Glass Fiber Reinforced Cement (GRC) and Expanded Polystyrene (EPS) material to obtain better insulations. This study is performed by modeling the area of 4 housing units using ENVI-met V4 in a humid tropical climate, focused in an east-west direction in a clear sky. Each building measures eight times 6 m2, with 4 meters in height, with a distance between buildings of 3 meters. GRC and EPS are affixed to the entire surface of the outer wall of the building, both on the east side and west sidewalls. The parameter observed is the wall surface temperature. The results showed that walls with GRC and EPS gave more effective results in lowering the surface temperature of brick walls, with values ranging from 8-23%. The use of insulation intervention on the east wall at 06.00-12.00 and the west wall at 13.00-18.00 shows higher accumulated surface temperature than the standard brick wall at peak hours, which means that the insulation material controls solar radiation. However, the phenomenon on the east wall at 12.00-07.00 and the west wall at 18.00-13.00 shows a controlled temperature above the surface temperature when using a standard brick wall.
8
Lv, Chun. "Status and Development Trend of Energy-Saving Wall Materials in Cold Areas." Advanced Materials Research 150-151 (October 2010): 630–33. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.630.
Анотація:
The primary factor in reducing building energy consumption is the wall energy, but thickening the walls simply and using traditional materials to reduce energy consumption has become unable to satisfy the development trend at the present stage. Energy-saving wall materials include organic wall insulation, inorganic wall insulation and composite wall insulation. According to the construction technology, insulation wall can be divided into internal insulation wall, sandwich insulation wall and external insulation wall etc.. Polyurethane foam and other new energy-saving materials are widely used, whicth will become the main energy-saving materials in the northern cold areas.
9
Antolinc, David, Katarina Černe, and Zvonko Jagličić. "Risk of Using Capillary Active Interior Insulation in a Cold Climate." Energies 14, no. 21 (October 20, 2021): 6890. http://dx.doi.org/10.3390/en14216890.
Анотація:
The retrofitting of cultural heritage buildings for energy efficiency often requires the internal thermal insulation of external walls. Most of the in situ studies of capillary active interior insulation were performed in mild oceanic climate regions, and they showed an excellent performance. However, as a large part of Central–Eastern Europe belongs to a continental climate with cold winters and long periods of temperatures below the freezing temperature, the applicability of the capillary active interior insulation in cold climate was studied. The hydrothermal behaviour of the three walls was determined—each consists of one of three different interior insulations—and the original wall is made of historic regular solid bricks. Two interior thermal insulations were capillary active (aerated cellular concrete, calcium silicate) and one vapour-tight (glass foam). A hot box–cold box experiment and a steady-state model were used to demonstrate an increase in the original wall mass due to the water condensation only when the capillary active interior insulation is used. The combination of the water condensation and the low sub-zero temperature may lead to a risk of freeze–thaw damage to the original wall. The numerical simulation of the water vapour condensation for the considered walls for the Slovenian town Bled with sub-zero average winter temperatures was performed to obtain the whole temperature and moisture profile. It showed good agreement between an experimentally and numerically obtained amount of water condensation. The capillary active interior insulation proved to be unsuitable for improving the thermal insulation of buildings in cold continental climate, and only a vapour-tight system can be recommended.
10
Oh, Tae Sik, Seok Joon Jang, Kang Min Lee, and Hyun Do Yun. "Insulation Type Effect on the Direct Shear Behavior of Concrete Sandwich Panel (CSP) with Non-Shear Connectors." Advanced Materials Research 663 (February 2013): 154–58. http://dx.doi.org/10.4028/www.scientific.net/amr.663.154.
Анотація:
Precast concrete sandwich panels (PCSP) are often used as exterior cladding of residential buildings due to thermal efficiency. PCSP systems consist of two precast reinforced concrete walls separated by a layer of insulation and connected with connectors which penetrate the insulation layer and are anchored at two precast walls. This paper provides the pull-out test results of concrete sandwich panel (CSP) with non-shear connectors. The variables in this study were the casting direction of reinforced concrete walls and types of insulation. Test results indicated that the types of insulations and casting direction have a significant effect on the bond strength between concrete wall and insulation. The effect of insulation type is notable for CSP cast horizontally concrete walls.
11
Luo, Yi Ying, Xiao Yan Wu, Yi Xiang, and Zhi Rong Niu. "Temperature Comparison of External Thermal Insulation Wall Using Foam Glass under Thermal and Humidity Effect." Advanced Materials Research 873 (December 2013): 257–66. http://dx.doi.org/10.4028/www.scientific.net/amr.873.257.
Анотація:
Experiments are performed aiming at the hot summer and cold winter area climate characteristics. The BWNH-3021 type weather-resistant testing apparatus is used to achieve performances of foam glass exterior thermal insulation walls. Real-time temperatures of each functional layer are tested under hot rain cycle effect. The temperature curves are plotted to make comparisons. When the environment temperature rises about 60°C, the temperatures of primary wall will rise only 8.20°C9.30°C each in 1#2# testing wall. When cold water is suddenly sprayed, the environment temperature will fall about 51°C. Then the temperatures of primary wall will fall only 4.00°C4.20°C each in 1#2# testing wall. It shows the good thermal insulating property of foam glass exterior thermal insulation wall. The environment temperature fluctuation can also be eliminated significantly. Attenuation coefficients of different thermal insulation walls are calculated. The maximum attenuation coefficients are present when temperature is rising. The coefficients of 1#2# testing wall are 15.00 and 4.60 separately. And the delay-times of two walls are 148min133min respectively. Both of the total attenuation coefficient and delay-time of 1# wall are greater than those of 2# wall. It indicates that a thicker layer makes the temperature wave decays more and takes longer time to delay. It proved that a thicker external thermal insulation structural layer contributes to the resistance of temperature fluctuation and thermal stability.
12
Zhao, Liang, Shuang Yao, Yunxi Nan, Linyuan Qin, and Shanmei Yi. "Research Status and Development Trend of Sintered Solid Waste-based Wall Insulation Materials." Journal of Physics: Conference Series 2510, no. 1 (June 1, 2023): 012019. http://dx.doi.org/10.1088/1742-6596/2510/1/012019.
Анотація:
Abstract Improving the thermal performance of the building envelope and reducing the energy consumption of heat transfer are particularly important for building energy conservation. Wall insulation materials can be divided into sintered and non-sintered two types. Sintered wall insulation materials have unique advantages in the development of self-insulating wall because of their high strength, good insulation ability and wide range of raw materials. In this paper, the research status of shale, fly ash, coal gangue and phosphogypsum as raw materials to develop wall insulation materials are introduced, feasible research direction in view of the significantly reduced thermal performance and durability of sintered self-insulating wall materials in high humidity environment and high sintering temperature are put forward. The research on the formation and control mechanism of high closed porosity structure and the action mechanism of multiple fluxes can provide theoretical support for the design and optimization of self-insulation wall materials with light, high strength, low sintering temperature and meeting the requirements of building energy conservation.
13
Wei, Shang You, Xian Feng Huang, Zhi Xiang Zhuang, and Jun Xin Lan. "Research on the Prediction of Impact Sound Insulation to a Homogeneous Wall." Applied Mechanics and Materials 744-746 (March 2015): 1593–96. http://dx.doi.org/10.4028/www.scientific.net/amm.744-746.1593.
Анотація:
In this paper, a theoretical model to evaluate impact sound transmission through a homogeneous wall is proposed. The model which is based on the Statistical Energy Analysis framework exhibits a system with room-wall-room. For the purpose to explore the mechanism of impact sound transmission through a wall, the impact sound reduction index between two rooms are predicted. Meanwhile, the variation of impact sound reduction index with the walls properties are also taken into account. The results reveal that the density, elastic modulus and thickness of a homogeneous wall have diverse effects on its impact sound insulation and can be chosen adequately to achieve ideal insulation values.It provides an approach to optimize impact sound insulating properties of the walls.
14
Zhao, Shan, Feng Lan Li, Su Yang, and Li Sha Song. "Thermal Insulation Behaviors of Rinforced Concrete Composite Wall with Inner Insulating Layer." Advanced Materials Research 152-153 (October 2010): 395–98. http://dx.doi.org/10.4028/www.scientific.net/amr.152-153.395.
Анотація:
The new reinforced concrete composite wall (RCCW) with inner insulating layer of polystyrene panel was developed to improve the durability of external thermal insulation plate on walls. The composite structure and construction method of the RCCW is briefly introduced in this paper. The thermal insulation behaviors such as conduct heat coefficient and total heat resistance of RCCW are tested by the protection chest method, the measured and calculated results of thermal insulation properties of the RCCW are compared with each other, the effect of heat-bridge resulted from connected concrete supports of specimen and bottom side concrete of specimen covering inner insulating layer on the test results is discussed.
15
Liu, Li, Yi Yue, and Jian Xin Cao. "Study of Xonotlite Architectural Coatings for Exterior Wall Insulation Mechanism." Materials Science Forum 809-810 (December 2014): 672–75. http://dx.doi.org/10.4028/www.scientific.net/msf.809-810.672.
Анотація:
Thermal insulation exterior wall coating has been successfully prepared, using styrene-acrylic emulsion as film former, and xonotlite as heat-insulating filler, which produced by hydrothermal reaction. The insulation mechanism of xonotlite is explored, through analyzing the microstructure of homemade xonotlite thermal insulation exterior wall coating. The results show that xonotlite is a kind of compound type heat-insulating filler that can effectively weakened the heat transfer in the coating, like heat conduction, thermal convection and thermal radiation.
16
Miao, Ji Kui, and Qing De Bing. "Study on Energy Efficiency Design of Self-Insulation System with Autoclaved Aerated Concrete Block in Cold Regions." Applied Mechanics and Materials 507 (January 2014): 515–20. http://dx.doi.org/10.4028/www.scientific.net/amm.507.515.
Анотація:
Self-insulation wall made of autoclaved aerated concrete has integrated the functions of structure and insulation in one; it has become the focus of the development of outer wall energy-saving technologies. To study the feasibility of the autoclaved aerated concrete block wall in the cold regions, we take one office building in Jinan City as an engineering example, present the construction practices of the self-insulation wall and the thermal bridge, and carry out the numerical simulation analysis of the energy consumption. The results show that autoclaved aerated concrete self-insulation wall meet the office building energy efficiency design standards for cold areas. Based on the analysis of the wall thermal parameter, the optimum thickness of the block masonry and insulating layer of thermal bridge are proposed for engineering designers reference.
17
Prasanth, R., M. Muralidharan, A. Arun, S. Ravi Shankar, S. Vinoth, and Y. Vinod Kumar. "Analysis of Energy Loss through Conventional Refractory Lining in Refinery Heater and its Conservation Measures." International Journal of Engineering & Technology 7, no. 3.34 (September 1, 2018): 118. http://dx.doi.org/10.14419/ijet.v7i3.34.18786.
Анотація:
The work of this project is to analyze theinsulation materials currently used in the furnace of CPCL refinery which is a crude distillation unit heater to minimize the heat loss through the radiant wall section by substituting them with advanced insulating materials.There are some advanced materials whose properties are well suited for the insulation purpose in the furnace wall which could apparently reduce the heat loss through the walls. The general properties which include weight, thickness, thermal conductivity, are calculated to prove that these materials can be used as a replacement to those of the regular insulation materials.The materials which have been taken for analysis can reduce heat loss and improve thermal efficiency it will not require much maintenance activities compared to the old insulation and installing the new insulation is much easier than old as it can be handled easily.This paper will prove that replaced materials will act as an effective insulation than old type.
18
Michálková, Daniela, and Pavol Ďurica. "Measured Impact of Material Settlement in a Timber-Frame Wall with Loose Fill Insulation." Buildings 13, no. 7 (June 26, 2023): 1622. http://dx.doi.org/10.3390/buildings13071622.
Анотація:
Loose-fill thermal insulations in timber-frame structures are designed to provide efficient thermal protection with the ability to fill intricate details. In a previous study, we detected several air cavities formed in timber-framed wall samples filled with loose-fill mineral fiber insulation. This discovery led us to retrofit the walls by adding appropriate insulation, thus enabling us to evaluate the importance of proper amendment. This paper focuses on a wall fragment with an 80 mm high air gap at the top and a 30 mm high cavity in the middle of the wall height. The following paper compares data collected before the discovery and after the replenishment (refill of air gaps with additional insulation), evaluating potential thermal performance improvement. We were able to quantify the impact of these defects on the external wall exposed to realistic conditions. Based on temperature and relative humidity measurements, the results show significant advancement in the middle of wall thickness with an 8 °C and 45% difference. The results show that although this defect did not directly affect the energy balance of the building, it significantly increases the risk of mold growth due to thermal bridging.
19
Lu, Xiao Dong, Jin Hong Wang, and Wei Ling Wang. "Windows Sound Insulation Research with Different Glass." Applied Mechanics and Materials 584-586 (July 2014): 1868–71. http://dx.doi.org/10.4028/www.scientific.net/amm.584-586.1868.
Анотація:
As the weak area of the residence envelope’s, window’s sound insulation is very important in the way of indoor quiet assurance. Base on the road traffic noise as sound sources, the sound insulation comparative studies is made between the insulating laminated glass and double insulated glass. The article choose two similar rooms near the Gaoerji road in Dalian assembled with the different windows, one room’s window was assembled with the insulating laminated glasses, and the other was assembled with double insulated glasses. Research shows that sound insulation effect of the wall with insulating laminated glass is better than the wall with double insulated glass 4dB.
20
Zhu, Yan, Jian Ge, and Dan Hua Ying. "Research of Appropriateness of Residence Outer Wall Thermal Insulating System in New Rural Construction in Zhejiang." Advanced Materials Research 461 (February 2012): 237–40. http://dx.doi.org/10.4028/www.scientific.net/amr.461.237.
Анотація:
Buildings have consumed around 1/4-1/3 of the country’s energy consumptions, of which the envelope structures, especially the outer walls, takes the largest percentage. The pilot program for external thermal insulation in new rural construction has commenced along with full implementation of outer wall energy saving and thermal insulation in Hot Summer and Cold Winter Zone. The program has proved the thermal insulating technology which is characterized by broad applicability, strong operability, reliable thermal insulating performance and low comprehensive cost, is a set of thermal insulating technology compatible with the level of rural economic and technical development in China.
21
Guan, Tu Hua, Yuan Bin Xu, Hong Mei Liu, Cheng Qun Wu, and Yang Shen. "Application Research on Reflective Insulation Coating Composite Insulation Wall." Applied Mechanics and Materials 633-634 (September 2014): 893–96. http://dx.doi.org/10.4028/www.scientific.net/amm.633-634.893.
Анотація:
Kind of self-insulation walls which combined silt sintered porous brick with reflective insulation coating to local conditions are introduced in this paper. It not only can reach the effect of composite insulation, but also can eliminate fire safety hidden danger of the self-insulation wall. Exterior wall of the summer and winter thermal performance were analyzed, Through its feasibility experiments and is worth a certain region to promote.
22
Balo, Figen, and Alptekin Ulutaş. "Energy-Performance Evaluation with Revit Analysis of Mathematical-Model-Based Optimal Insulation Thickness." Buildings 13, no. 2 (February 2, 2023): 408. http://dx.doi.org/10.3390/buildings13020408.
Анотація:
This study investigates the optimum insulation thickness value using MATLAB Optimization Toolbox based on a mathematical model for sandwich walls that are formed with different insulation-building materials by different fuel types for a particular city located in the second climatic region of Turkey. In the second stage of study, using the BIM-based Revit simulation program, a building was designed with the same building-insulation materials under the same climate conditions. The six different wall performances were compared for the designed building. The study proposes a comprehensive approach by combining technical and economic factors in the sustainable design of buildings. The computational results indicate that using different energy alternatives has a significant impact on the air quality in residential areas. The lowest value is reached when natural gas is used. The energy cost savings change from 7.56 to 14.12 TRY/m2 for external walls. While payback periods vary between 2.15 and 3.76 years for external walls, the lowest period for all wall types is obtained for electricity, which has a high cost. The optimum insulation thickness for 10 years of lifetime varies between 0.02 and 0.16 m. This study reflects that the highest optimal insulating thickness is reached when electricity is utilized as the energy source for all wall types. According to the Revit analysis, the lowest energy consumption of 21,677 kWh during one year using natural gas was obtained for a building material of porous light brick and an insulation material of glass wool.
23
Jensen, Nickolaj Feldt, Carsten Rode, Birgitte Andersen, Søren Peter Bjarløv, and Eva B. Møller. "Internal insulation of solid masonry walls – field experiment with Phenolic foam and lime-cork based insulating plaster." E3S Web of Conferences 172 (2020): 01003. http://dx.doi.org/10.1051/e3sconf/202017201003.
Анотація:
The study investigated the hygrothermal performance and risk of mould growth in two thermal insulation systems for internal retrofitting purposes; a phenolic foam system with a closed cell structure, and a capillary active diffusion-open lime-cork based insulating plaster. The setup consisted of a 40-feet (12.2 m) insulated reefer container with controlled indoor climate, reconfigured with several holes (1x2 m each) containing solid masonry walls with embedded wooden elements on the interior side and different interior insulation systems, with and without exterior hydrophobisation. Focus was on the conditions in the interface between wall and insulation system, and in the embedded wooden elements. Relative humidity and temperature were measured in several locations in the test walls over two years, and the mould risk was evaluated by measurements and the VTT mould growth model. Findings for the interior phenolic foam system indicated that exposed walls experienced high relative humidity and high risk of moisture-induced problems. Exterior hydrophobisation had a positive effect on the moisture balance for the southwest oriented wall with phenolic foam. The lime-cork based insulating plaster showed high relative humidity and risk of moisture-induced problems, with and without hydrophobisation.
24
Axaopoulos, Ioannis, Petros Axaopoulos, John Gelegenis, and Emmanouil D. Fylladitakis. "Optimum external wall insulation thickness considering the annual CO2 emissions." Journal of Building Physics 42, no. 4 (May 22, 2018): 527–44. http://dx.doi.org/10.1177/1744259118774711.
Анотація:
Increasing the insulation thickness in residential buildings leads to the reduction of operational CO2 emissions but simultaneously increases the embodied CO2 due to the insulation material. The environmentally optimum insulation thickness exists at a point where the total CO2 emissions are minimum. This work presents the optimum insulation thickness for external walls of different composition and orientation, for both the heating and the cooling period. Three different wall types and insulation materials are being presented. The dynamic thermal behavior of the external walls simulation is based on the heat conduction transfer functions method and using the hourly climatic data available for the city of Athens, Greece. The optimization methodology uses a single objective function approach, combining the simulation of the thermal behavior of external walls with an optimization algorithm. The results indicate that the optimum insulation thickness varies from 11.2 to 23.4 cm and is different for each orientation, wall type, and insulation material. In addition, the total annual CO2 emissions per unit area of the wall can be reduced by 63.2%–72.2%, depending on the insulation material and its position on the wall.
25
Ruan, Fang, Xiao Qian Qian, Yao Tai Zhu, Min Li Wu, Kuang Liang Qian, and Meng Ping Feng. "Wall Insulation Effect on Building Energy Efficiency with the Intermittent and Compartmental Energy Consuming Method." Applied Mechanics and Materials 744-746 (March 2015): 2340–47. http://dx.doi.org/10.4028/www.scientific.net/amm.744-746.2340.
Анотація:
Based on the intermittent and compartmental energy consuming method of residential buildings in Hot Summer and Cold Winter Zone, a two-dimensional heat transfer model of one household flat is built for a transient study of the wall insulation effect on building energy efficiency. With the mode of compartmental energy consuming, the energy consumption of interior walls accounts for nearly 45% of the total amount, thus insulation for interior walls should be taken into more consideration as well as for exterior walls. With the intermittent energy consuming mode, exterior wall external insulation can decrease air-conditioner heating load. However, when cooling in summer nights, the temperature of wall is higher than both indoor and outdoor. External insulation hinders heat in walls from dissipating to outside, and thus there is an “anti-insulation” effect existing here. Interior insulation can effectively decrease both heating and cooling loads of air-conditioner.
26
Jochim, Stanislav, Róbert Uhrín, Jarmila Schmidtová, Pavol Sedlák, Dominika Búryová, and Katarína Střelcová. "Impact of Vapor Barrier on Moisture Content of Fiberboard Insulation in Log Structure." Polymers 13, no. 24 (December 7, 2021): 4282. http://dx.doi.org/10.3390/polym13244282.
Анотація:
The paper is focused on a verification of the moisture content of fiberboard insulations in the multilayer loadbearing log wall designed with and without the vapor barrier. Experimental verification was done using a sample of the multilayer loadbearing log wall built in a research timber structure building under in-situ conditions. Indoor properties of the building met conditions for human occupancy. The experiment was performed for 2 years and 3 months. Aims of the fiberboard insulations moisture content verification in the walls were to verify the effect of vapor barrier in various periods of the year and verify excessive moisture in the fiberboard insulations, which is undesirable in terms of biodegradation. The results of measuring the moisture content showed that after a certain period, the difference of insulation moisture content in the wall including and excluding vapor barrier is negligible, as well as other results and conclusions for designing the composition of multilayer loadbearing log walls.
27
Li, Yu Mei, Tao Ding, and Zong Tao Chen. "Structural Optimization and Electric Field Analysis on the Insulation Structure of UHDV Wall Bushing." Advanced Materials Research 732-733 (August 2013): 1052–55. http://dx.doi.org/10.4028/www.scientific.net/amr.732-733.1052.
Анотація:
The insulation mechanism of UHVDC wall bushing is discussed. Design solution of the insulation structure is determined. In the solution, internal insulation includes SF6 gas-insulated and shielding structure, and external insulation is a type of composite insulating material, which is made up of epoxy FRP pipe and silicone rubber sheds. Creepage distance of external insulation and two types of shielding structures are designed in the paper. Finally two types of shielding structure are compared and optimized based on electric field simulation, and the result shows that dual-plate grounded shielding can enable the electric field strength of UHVDC wall bushing more evenly distributed.
28
Iffa, Emishaw, Mikael Salonvaara, and Diana Hun. "Energy performance analysis of smart wall system with switchable insulation and thermal storage capacity." Journal of Physics: Conference Series 2069, no. 1 (November 1, 2021): 012092. http://dx.doi.org/10.1088/1742-6596/2069/1/012092.
Анотація:
Abstract The ever-increasing global energy demand and the issues caused by population growth and unsustainable energy resource usages have several environmental and economic impacts. The on-demand capability of dynamic wall systems with switchable insulation systems can contribute toward energy efficiency and reduced electric cost using “building-as-a-battery.” In this paper, the performance of an exterior envelope system that employs a switchable insulation system is investigated. A COMSOL simulation was used to study the envelope performance under three switchable insulation locations in the wall system. The on and off switching cycle included insulating or conducting the exterior, interior, or both sides of the mass wall system. To validate the simulation work, an experimental test was conducted in climate chamber on a 4 × 8 in. wall system with identical wall components used in the COMSOL simulation. Results show a good agreement between the experiment and simulation results. The wall system with switchable insulation placed on the exterior side provided the highest interior inward heat flux when compared with the interior or split insulation. Also, an exterior switchable insulation system in addition to a thermal mass maintained a positive heat flow for more hours when the outdoor temperature was lower than the interior temperature.
29
Jiang, Deng Ling, Jing Zhao, and Guo Wei Ni. "The Status and Development of New-Type Wall Material." Advanced Materials Research 194-196 (February 2011): 1134–37. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.1134.
Анотація:
As is known to us, producing tradition wall materials will consume lots of energy and spoil the environment. Therefore, new-type wall has aroused great concern among people in construction, which is green, insulating and energy-saving and so on. External insulation, promoted as an energy-saving technology in building insulation, has three more mature technologies. This paper also introduces polyurethane insulation material, as the third generation of energy-saving wall materials, has a very good application prospect in scientific research. Finally, in the last of the paper, relative countermeasures and suggestions are made to improve the status and development of new-type wall materials, for instance: we should make the most of industrial waste, make deep research in new composite wall systems and wall materials; take some effective measures to accelerate the application of new wall materials and so on.
30
UÇAR, Aynur. "Thermal Analysis of Insulation Materials Used for Exterior Walls of Buildings Considering the Wind Effect." European Journal of Technic 12, no. 2 (December 30, 2022): 108–16. http://dx.doi.org/10.36222/ejt.1051230.
Анотація:
The optimum thickness of insulation material dependent on wall orientation and wind speed were determined for selected insulation materials and external wall types in different compositions and orientations by using the Life Cycle Cost method. The methodology is applied as a case study by comparing the different combinations of thermally insulated walls with four different insulation materials for four different degree-day regions of Turkey considering the effect of wind speed and direction. In the economic analysis, the costs of the life cycle of each different combination of insulated walls were calculated. It was obtained from these results that heating requirement of the north facing wall was the highest and heating requirement of the south facing wall was the lowest. The optimum thickness of insulation changes from 4.77 to 13.35 cm dependent on the insulation materials and orientations.
31
Mishra, Subhash, Shri Bhagwan, and Pradeep Barnwal. "Energy Saving Analysis for Mud Wall Construction." International Journal of Advance Research and Innovation 9, no. 2 (2021): 108–14. http://dx.doi.org/10.51976/ijari.922117.
Анотація:
In building construction, the energy saving is very important for coming day. Energy saving is closely related with conservation of energy. The consequences of conservation of energy related to efforts reduce to consumption of energy. A certain amount of energy may be saved , when critical thickness of insulation is used in building walls. The purpose of thermal insulation is to keep the indoor temperature constant due to variation of atmospheric temperature. The main aim of mud wall construction is to save considerable amount of energy by providing a more stable temperature and reduces the heat losses through outer boundary of walls. Mud is act as a thermal mass due to it absorbs sun heat during day hours and keep the building warm during night. The energy saving by using mud insulation and straw material for the analysing the mud wall constructed room dimension (10 m x 8 m x 7 m) situated at Ghaziabad near Salimar Garden has been selected. The studies are carried out for varied thickness of insulation mud dung slurry. This study found that mud wall insulation is most economic insulation. In this analysis, it is observed that 51 % of energy is conserved by the application of mud dung slurry insulation for mud wall construction. In our result, 0.068 m optimum thickness of mud wall construction has been calculated, when insulation is used.
32
Popovski, Kire, Sevde Stavreva, Ivo Kuzmanov, and Igor Popovski. "Mathematical model for computer simulation for selection of the order for the layers from the wall of industrial coolers." South Florida Journal of Development 3, no. 3 (June 3, 2022): 3681–88. http://dx.doi.org/10.46932/sfjdv3n3-051.
Анотація:
A mathematical model and computer software was developed for calculating the thickness of the insulation layers (panels) from the walls of the industrial coolers based on the order of their installation. A numerical example is given that is tested on an existing industrial cooler in Bitola, Macedonia. In order to calculate the thickness of the thermal insulation it is necessary to consider a multilayer barrier (wall) where for each layer the thickness is known, except for the insulation material which should be calculated. With the determined geometric and physical characteristics of the wall, it is necessary to determine the temperature at each point of the construction. By connecting these points, the temperature change through the construction creates dependency with its thickness. After calculating the actual specific heat flux, the temperatures between each layer of the wall are calculated. For improved monitoring of the change in the partial pressure of the saturated water vapor through the layers of the wall, the thickness of the insulating material is divided into approximately five parts, and then a table of temperature changes and the corresponding value of the partial pressure of the saturated aqueous vapor is created. In order to avoid condensation of the water vapor when it passes through the wall, a certain condition must be fulfilled. With certain measurements adopted, a computer simulation was created and measurementes calculated. The computer simulation enables swift and accurate calculation of thickness of the insulation at multilayer bulkheads found at industrial coolers, and allows selection of the location for the insulation and steam barrier in the bulkhead.
33
Min, Xinghua, Ming Chen, and Ting Qu. "Sound Insulation Performance Analysis of New Energy - saving Lightweight Wooden Wall." IOP Conference Series: Earth and Environmental Science 966, no. 1 (January 1, 2022): 012007. http://dx.doi.org/10.1088/1755-1315/966/1/012007.
Анотація:
Abstract In this paper, a kind of light energy-saving prefabricated building high sound insulation wood wall is designed, and its sound insulation performance is experimentally studied in practical housing applications. Firstly, an energy-saving wood wall is designed on the basis of a sound insulation calculation with weighted sound transmission loss of 44.0 dB. Secondly, the energy-saving wood wall is implemented in practical house applications and the corresponding sound insulation of the wall is measured for evaluation. Measurement results show that the actual weighted sound transmission loss of the wall is 24.0 dB. Further analysis indicates that the gaps of the plates and rigid connections are the main causes of the sound insulation decrease in the actual application of this lightweight wall. This paper provides the design method of lightweight walls for new energy-saving light prefabricated houses, and indicates the importance of optimizing the construction details to guarantee the overall sound insulation performance of energy-saving light prefabricated houses.
34
Shin, Hye Kyung, Kyoung Woo Kim, A. Yeong Jeong, and Kwan Seop Yang. "Analysis of Sound Insulation Performance of Reinforce Concrete Walls between Households According to Wall Thickness Criteria in Apartments." Applied Mechanics and Materials 873 (November 2017): 237–42. http://dx.doi.org/10.4028/www.scientific.net/amm.873.237.
Анотація:
Sound insulation between households is properly ensured to provide a quiet residential environment in apartments. The legal requirements for sound insulation in apartments in Korea are set to meet the wall’s minimum thickness or sound insulation performance. When construction companies choose the walls that satisfy thethickness in the standards of boundary walls between households, it is difficult to know the sound insulation performance. In this study, the sound insulation performance of reinforced concrete walls is predicted according to the wall thickness criteria and analyzed through field measurements. In newly built apartments, the reinforced concrete wall’s sound insulation performance(R'w) is 56 – 66 dB, which is a similar level of the international criterion. And the sound insulation performance of the reinforced concrete wall according to thickness standards is similar to sound insulation performance standardsof Korea.
35
Khoirudin, Khoirudin. "OPTIMASI DESAIN PADA DINDING FURNACE DENGAN TEMPERATUR KERJA 1000 C." JURNAL KAJIAN TEKNIK MESIN 3, no. 1 (May 29, 2019): 1–8. http://dx.doi.org/10.52447/jktm.v3i1.1054.
Анотація:
The aims of this research is to study and analysis on furnace walls with variation of hot face lining material types, variation of refractory material types, and variation of thickness of insulating materials to outer wall temperature at furnace with working temperature 1000 oC. This research uses a variety of hot face lining material in the form of ceramic fiber blanket with CR1260, CR1400, and CR1430, variations of refractory material in the form of refractory brick with the type NJM-20, NJM-23, and NJM-26, and using ROCKWOOL as an insulating material with a thickness variation of 50 mm, 75 mm, 100 mm. This research was simulated using Steady State Thermal ANSYS Mechanical (ANSYS Multiphysic) software. The result of the research shows the difference of the outer wall temperature value of the furnace. The highest wall temperature is in interaction with the wall without insulation, hot face lining material using CR1260, and NJM-26 as refractory material is 75.211 oC. While the lowest wall temperature is in the interaction of 100 mm thick insulation, hot face lining material using CR1430, NJM-20 as refractory material is 46.682 oC.
36
Yang, Fang, Lin Zhu Sun, and Zi Ling Xie. "Theoretical Study on Optimal Design of Thermal Performance of Aerated Concrete-Based Composite Thermal Insulation Wall." Advanced Materials Research 450-451 (January 2012): 663–66. http://dx.doi.org/10.4028/www.scientific.net/amr.450-451.663.
Анотація:
A wall of aerated concrete only can hardly meet the requirements for energy-saving architectural design. If both sides of the wall are provided with thermal insulation mortar to form a composite wall, the heat transfer performance of the wall will be significantly improved. In this Paper, we established an optimization model for the thermal economy of a thermal insulation composite wall according to heat transfer theory and in consideration of the depreciation and maintenance costs of the wall during use, and took the average heat transfer coefficient and index of thermal inertia of the wall as restricted conditions to calculate and analyze the economical thickness of the thermal insulation layer. We expect the optimization model be valuable reference in promoting the application of aerated concrete-based composite thermal insulation walls.
37
Geng, Sen Lin, and Fang Ju Li. "Design of the Sound Insulation Chamber for Stored Grain Insect Sound Detection." Applied Mechanics and Materials 220-223 (November 2012): 1598–601. http://dx.doi.org/10.4028/www.scientific.net/amm.220-223.1598.
Анотація:
A six cubic meter sound insulation chamber is designed based on the principle of double-layer wall sound insulating and porous absorption with the characteristics of stored grain insect action sound. With 3 mm thick plywood as wall material, double - layer spacing 0.08 m, the outer wall being bored, each aperture 1mm, average spacing 1.5 cm, and the hard sound-absorbing material being filled in the two layers, a quasi - double layer perforated structure is built. The ambient noise is uniformly insulated between 125Hz and 2000Hz, and the average sound insulation is about 22dB, and it meets requirements of stored grain insect action sound for the spectrum and SPL. The result shows that the sound insulation chamber has the advantages of small size, economy, and good sound insulation effects.
38
Lisitano, Ivana Mattea, Deborah Laggiard, Stefano Fantucci, Valentina Serra, and Elisa Fenoglio. "Evaluating the Impact of Indoor Insulation on Historic Buildings: A Multilevel Approach Involving Heat and Moisture Simulations." Applied Sciences 11, no. 17 (August 27, 2021): 7944. http://dx.doi.org/10.3390/app11177944.
Анотація:
The energy refurbishment of historic buildings is a complex task for building envelope designers who need to carefully consider building conservation guidelines and principles. In most cases, external wall insulation techniques can determine an unacceptable alteration of the historical value of a building. For this reason, internal wall insulation techniques have been used widely in the last few decades. Nevertheless, dealing with internal wall insulation requires a complex design to avoid the risk of condensation and moisture-related pathologies. Moreover, an internal wall insulation may have a relevant impact on indoor comfort conditions. In this paper, the Monastery of Santa Maria de Monfero in Galicia (Spain) has been adopted as a building case study to compare different technological solutions based on: (i) an insulating plaster layer, (ii) dry counter wall systems. In the first step, heat and moisture transfer simulations of the wall components were performed to analyze the hygrothermal behavior of the different alternatives considering two different climate conditions. In a second step, a simulation of the whole building was performed to analyze the impact of the retrofitting strategies on the indoor climate and on the building heating and cooling demand. The obtained results show that the counter wall solution leads to higher energy savings during the heating season in the colder winter climate. However, the use of insulating thermal plaster could also be a viable solution since they lead to several advantages in summer because of their higher thermal inertia. Therefore, the selection of the most appropriate insulation technique has to be evaluated carefully considering the outdoor/indoor climate and using a case-by-case approach.
39
Jeong, Young Sun. "Experimental Study on the Thermal Conductivity of Thermal Insulation Materials Used in Residential Buildings." Advanced Materials Research 1025-1026 (September 2014): 535–38. http://dx.doi.org/10.4028/www.scientific.net/amr.1025-1026.535.
Анотація:
The most basic way to keep comfortable indoor environments for a building’s occupants and save energy for space heating and cooling in residential buildings is to insulate the building envelope. Among the building materials to be used, thermal insulation materials primarily influence thermal performance. In particular, the type, thermal conductivity, density, and thickness of heat insulator, are important factors influencing thermal insulation performance. We investigate the design status of residential buildings which were designed in accordance with the building code of Korea and selected the type of thermal insulation materials applied to the walls of buildings. The present study aims at measuring the thermal conductivity of thermal insulation materials used for building walls of residential buildings. In this study, after collecting the design documents of 129 residential buildings, we investigated the type and thickness of insulation materials on the exterior wall specified in the design documents. As the thermal insulation materials, extruded polystyrene (XPS) board and expanded polystyrene(EPS) board are used the most widely in Korea when designing residential buildings. The thickness of thermal insulation materials applied to the exterior wall was 70mm, most frequently applied to the design. We measured the thermal conductivity and the density of XPS board and EPS board. When the density of XPS and EPS was 30~35 kg/㎥, the thermal conductivity of XPS was 0.0292 W/mK and it of EPS was 0.0316 W/mK.
40
Zhang, Shu Guo, Yan Fang, and Jun Ju Jia. "Study on Fuzzy Comprehensive Evaluation of External Wall Thermal Insulation and Energy-Saving Technology." Applied Mechanics and Materials 71-78 (July 2011): 1435–39. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.1435.
Анотація:
The current evaluation process of architecture external wall thermal insulation energy-saving has met the problems such as information incompleteness and fuzziness. In order to solve the problems, the fuzzy comprehensive evaluation method is used, and the external wall thermal insulation energy-saving technique evaluation index system is set. And the method is adopt to compare between the walls using and not using the technology. The result shows that the evaluation of the external wall using thermal insulation energy-saving technique is obviously better than the result of the external wall not using the technique, so the thermal insulation energy-saving material should be promoted and applied nation-widely.
41
Oh, Tae Sik, Seok Joon Jang, and Hyun Do Yun. "Shear Reinforcing Influence of GFRP Shear Connectors in the Concrete Sandwich Wall Panel (CSWP) for Exterior Envelopes of Buildings." Advanced Materials Research 658 (January 2013): 38–41. http://dx.doi.org/10.4028/www.scientific.net/amr.658.38.
Анотація:
This paper summarizes the experimental results of concrete sandwich wall panels (CSWP)specimens under pull-out loading conducted to investigate the effect of insulation type and reinforcing area of shear connector made with glass fiber-reinforced polymer (GFRP) on the shear behavior of CSWP used as exterior cladding walls.In this study, two types of thermal insulations;expanded polystyrene(EPS)and extruded polystyrene with special slots(XPSS) and wave-shaped GFRP shear connectors with different reinforcing area; 6mm x 2mm and 12mm x 2mm were used for CSWP specimens.Test results indicated that the types of insulations and reinforcing area of GFRP shear connectors have a significant effect on the direct shear behavior between concrete wall and insulation. As reinforcing area of GFRP shear connector increase, increase in shear strength of CSWP with EPS insulation is less than CSWP specimens with XPSS insulation due to relatively lower strength of EPS compared to XPSS strength.
42
De Mets, Timo, and Antoine Tilmans. "Evaluation of the risk of decay of wooden beams embedded in internally insulated walls by long-term measurements." E3S Web of Conferences 172 (2020): 01002. http://dx.doi.org/10.1051/e3sconf/202017201002.
Анотація:
Internal insulation of existing walls is crucial to increase the energy efficiency of the building stock. However, this technique influences the drying potential of the wall and could consequently increase the decay risk of wooden beams embedded in the existing wall. We performed a long-term field study on different test walls with wooden beams. This paper discusses 2.5 years of measurements by analysing the moisture contents at the beam ends for the different test walls. The use of vapour open insulation materials has only a slightly favourable impact. On the other hand, measures to lower the moisture content of the wall have a significant effect, either by locally interrupting the insulation at the beam junction or by applying a water repellent treatment. Controlling the rain load on the wall seems to be a key point towards a moisture-safe application of internal insulation with embedded wooden beams.
43
Zhou, Ming Gui. "Research on Thermal Insulation and Energy Saving of External Wall in City High-Rise Building of Cold Area." Applied Mechanics and Materials 686 (October 2014): 660–65. http://dx.doi.org/10.4028/www.scientific.net/amm.686.660.
Анотація:
This paper applies the method of numerical simulation and field detection, and studied energy-saving insulation characteristics on the external walls of high-rise buildings in cold area, analyze and recommend the best arrangement of building and the most generous exterior wall insulation system suitable for cold area, and the degree of insulation materials were studied. The results show that: the mode preferred cold area is exterior insulation, insulation material made of extruded polystyrene board, frame structure filling wall preferred ceramsite hollow block.
44
Ran, Jiandong, Ya Feng, Mei Dou, and Huizhi Zhong. "Influence of External Surface Radiation Properties on Thermal Performance of Walls——Take a typical office building in Chengdu as an example." E3S Web of Conferences 396 (2023): 04004. http://dx.doi.org/10.1051/e3sconf/202339604004.
Анотація:
In this paper, taking a typical office building in Chengdu as an example, the coupling relationship between the radiation properties (short-wave absorption coefficient and long-wave emission coefficient) of the external surface materials of the wall and the insulation types and the insulation performance is studied by using software simulation method. The results show that the internal insulation wall is beneficial to reduce the heating load while the external insulation wall is beneficial to reduce the cooling load. And the external surface material's radiative properties hardly affect the wall insulation type choice. Still, in the case of Chengdu office buildings, interior insulated walls are more conducive to year-round building energy efficiency. In summer, the radiation characteristics of the outer surface material will affect the choice of the best heat transfer coefficient (U-value) of the wall. When the short-wave radiation absorption coefficient is small, the wall with good insulation performance will appear anti-energy-saving phenomenon. Therefore, it is recommended that the regions with high cooling loads fully consider the influence of the external surface material's radiation properties on the wall's thermal performance in the design of the thermal performance of the wall.
45
bin Shammuin, Mohammad Hafizuddin, and Boon Tuan Tee. "Preliminary Study of Alternative Wall Insulation Materials for Home Residence." Applied Mechanics and Materials 699 (November 2014): 384–87. http://dx.doi.org/10.4028/www.scientific.net/amm.699.384.
Анотація:
With the growing interest of sustainable and green technology, there is a need of finding the alternative for wall insulation materials. The objective of this research is to evaluate the effectiveness of two types of insulation for the house wall as well as study the effect of those materials on temperature distribution in the house. Insulating materials that have been selected for this preliminary study are polystyrene, cellulose and coconut fiber. The measurement is conducted by using reconfigurable model house where the insulation materials can be inserted in the wall, roof and floor. The temperature data then were recorded using infra-red camera. The preliminary result from the experiment is presented in this paper.
46
Karabulut, Koray, Ertan Buyruk, and Ahmet Fertelli. "Numerical investigation of the effect of insulation on heat transfer of thermal bridges with different types." Thermal Science 20, no. 1 (2016): 185–95. http://dx.doi.org/10.2298/tsci130621052k.
Анотація:
In the present study, the effects of different types thermal bridges formed by beams for floor-wall junctions in reinforced concrete structures, with and without balconies, and the optimum configuration of the insulation layers to avoid heat loss were investigated as numerically. Both insulation between the walls and internal insulation was selected for floor-wall junctions and internal insulation was used for floor-wall junctions with balcony. Fluent package program was used to solve the temperature domain numerically. Results showed that high heat transfer rates were obtained in the region of thermal bridges for all building models. It was also obviously obtained that heat transfer rate decreased with making insulation on the beam surfaces.
47
Klebleev, T. I., and V. Yu Semenov. "Experimental Study of Heat Transfer in the Interwall Space of a Cryogenic Tank with Powder Insulation." Herald of the Bauman Moscow State Technical University. Series Mechanical Engineering, no. 3 (146) (September 2023): 113–26. http://dx.doi.org/10.18698/0236-3941-2023-3-113-126.
Анотація:
Currently, double-wall cryogenic non-isothermal tanks with vacuum-powder or vacuum-multilayer insulation are used in storage and transportation of such cryogenic liquids as liquid nitrogen, oxygen and liquefied natural gas. If the inner vessel is disrupted, the liquid spills into the heat-insulating space and evaporates as a result of heat inflow from the environment. This increases pressure in the thermal insulation space. To ensure functioning of the tank, it is necessary to limit pressure increase in the heat-insulating space. Results of experiments on evaporation of the liquid nitrogen entering the space filled with powder insulation were presented (expanded perlite was considered in the experiments). Experiments were carried out on a laboratory model simulating the tank heat-insulating space. Nature of the cryogenic liquid distribution in the powder insulation volume was determined, possibility of the cryogenic liquid direct contact with the walls of the tank was shown, and the tank walls temperatures and the cryogenic products evaporation intensity over time were determined. Based on the work results, physical and mathematical model of the emergency process development in the interwall space of a cryogenic tank associated with violation of the inner vessel tightness and subsequent spill of cryogenic liquid into the heat-insulating space was refined
48
Chen, Xiaofang, and Fukang Deng. "Optimal insulation thickness of walls using improved Particle swarm optimization." Engineering Research Express 4, no. 1 (February 11, 2022): 015019. http://dx.doi.org/10.1088/2631-8695/ac50fa.
Анотація:
Abstract Uninsulated external walls and inappropriate insulation of buildings are the main reason for energy losses. In this study, novel configurations of multi-layer pre-fabricate wall elements were used to enhance the ability of energy-saving and decrease the payback periods and investments in residential houses in five cities in Iran with different energy demands. Also, an optimization strategy is applied to determine optimum insulation thickness for external walls. The evaluation process is based on using natural gas and electricity in Iran’s buildings for heating and cooling, respectively. The optimum required insulation thickness in Cities with different climates according to their degree/day value for four different insulation materials (extruded polystyrene, glass wool, rock wool, and polyurethane) is achieved using a novel optimization method (Improved PSO). According to the obtained results, annual cost saving for 1 m 2 of the wall in case of simultaneous heating & cooling is more than cooling and heating alone. However, for the payback period, simultaneous heating & cooling has a lower payback period than cooling and heating alone. The results revealed that the cost of rock wool is higher, and the cost of polyurethane is higher than the cost of all other insulating materials in Ardabil. Also, the optimal insulation thickness for the Ardabil city with hollow brick walls and heating and cooling needs is x = 0.015 m and x = 0.005 m for the XPS, respectively.
49
Lan, Yirui, and Ran Zou. "Study on Thermal Performance Measurement and Construction of Passive Exterior Wall with Low Energy: Teaching and Laboratory Building of Shandong Jianzhu University." Advances in Materials Science and Engineering 2022 (June 3, 2022): 1–11. http://dx.doi.org/10.1155/2022/3253085.
Анотація:
It can provide theoretical support for the optimal design of low-energy walls by measuring the actual thermal conditions inside the walls of passive low-energy buildings and studying the rationality of the wall structure design. Taking the teaching and laboratory building of Shandong Jianzhu University as an example, this paper explores the method of using temperature and humidity sensor to measure the air temperature and humidity inside the wall to represent the solid temperature and humidity of the wall. Based on the measured data and calculation results, the rationality of the structure of the test external wall is analyzed from four aspects: the performance of insulation, the moisture drain performance of wall, the ability of preventing the penetration of the hot and humid air of the inner wall, and the waterproof performance of the outer wall. Results show that the external wall structure of polystyrene board (200 mm thick) for external insulation and thin plastering has good practical operation effect in three aspects of thermal insulation, internal moisture discharge, and external wall waterproof, which basically meets the design requirements of external wall of passive house in Germany. In terms of moisture protection of the inner wall, the inner wall of cement mortar (15 mm thick) may not be able to effectively prevent the infiltration of indoor hot and humid air. Thus, the insulation layer should be added into the external wall. In addition, the moisture inside the wall is obviously affected by the season. The drain performance of moisture inside the wall mainly occurs in the sweltering heat, and the drain direction is from the indoor side to the outdoor side. In the external insulation structure, there are two layers of graphite polystyrene plate (100 mm thick), and the insulation effect of polystyrene plate near the outdoor side is better than that near the indoor side. The combination of anticrack mortar (5 mm thick) and paint cannot completely prevent the infiltration of rainwater, but the infiltration of rainwater in the wall will be quickly discharged in a short time.
50
Zhang, Yan, and Xi Wu Gong. "The Energy Saving Effect Evaluation for Outside Wall with Different Material in Island District." Advanced Materials Research 301-303 (July 2011): 377–83. http://dx.doi.org/10.4028/www.scientific.net/amr.301-303.377.
Анотація:
In order to evaluate the energy saving effect for building outside wall under the damp island environment, the heat insulation performance of brick wall, MU10 concrete brick wall and aerated concrete are tested. The testing method is combined of infrared photos and heat flow meter. The results showed that the insulation performance of clay brick is worst, its heat transfer coefficient is 60% more than that required by energy saving standard. Although the concrete brick has painted 25mm polystyrene granule outside, the heat transfer coefficient is still smaller than energy saving standard required. The economic thickness of polystyrene granule is 79mm , which makes the both heating cost and insulating layer minimum during the life cycle of heat insulating layer. Among the three types of outside wall, only the aerated concrete can satisfy the energy saving standard for hot summer and cold winter district, it constitutes the self-insulating system.