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Auteur : Grafiati
Publié le 10 mars 2023

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1

Zhelykh, Vasyl, Olena Savchenko et Vadym Matusevych. « Horizontal earth-air heat exchanger for preheating external air in the mechanical ventilation system ». Selected Scientific Papers - Journal of Civil Engineering 13, no 1 (1 décembre 2018) : 71–76. http://dx.doi.org/10.1515/sspjce-2018-0021.

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Abstract To save traditional energy sources in mechanical ventilation systems, it is advisable to use low-energy ground energy for preheating or cooling the outside air. Heat exchange between ground and outside air occurs in ground heat exchangers. Many factors influence the process of heat transfer between air in the heat exchanger and the ground, in particular geological and climatic parameters of the construction site, parameters of the ventilation air in the projected house, physical and geometric parameters of the heat exchanger tube. Part of the parameters when designing a ventilation system with earth-air heat exchangers couldn’t be changed. The one of the factors, the change which directly affects the process of heat transfer between ground and air, is convective heat transfer coefficient from the internal surface of the heat exchanger tube. In this article the designs of a horizontal earthair heat exchanger with heat pipes was proposed. The use of heat pipes in designs of a horizontal heat exchanger allows intensification of the process of heat exchange by turbulence of air flow inside the heat exchanger. Besides this, additionally heat transfer from the ground to the air is carried out at the expense of heat transfer in the heat pipe itself.
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2

Argiriou, Athanassios A., Spyridon P. Lykoudis, Constantinos A. Balaras et Demosthenes N. Asimakopoulos. « Experimental Study of a Earth-to-Air Heat Exchanger Coupled to a Photovoltaic System ». Journal of Solar Energy Engineering 126, no 1 (1 février 2004) : 620–25. http://dx.doi.org/10.1115/1.1634584.

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Coupling a building to the ground as a heat sink through earth-to-air heat exchangers can reduce the cooling energy demand during summer. The fans for circulating the air through the heat exchangers are usually grid connected. However, given that the cooling loads are almost in phase with the available solar irradiance, an innovative system coupling an earth-to-air heat exchanger with a simple photovoltaic array has been designed. The experimental results are presented and discussed in this paper. The system was installed and studied in Athens, Greece during a summer period. The obtained results showed that the overall thermal performance of the system and the efficiencies involved indicate that earth-to-air heat exchangers are an interesting hybrid cooling technique and another field of application of photovoltaics.
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3

Qi, Di, Chuangyao Zhao, Shixiong Li, Ran Chen et Angui Li. « Numerical Assessment of Earth to Air Heat Exchanger with Variable Humidity Conditions in Greenhouses ». Energies 14, no 5 (3 mars 2021) : 1368. http://dx.doi.org/10.3390/en14051368.

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Earth to air heat exchangers are widely utilized to cool or heat passive buildings for energy savings. They often need to deal with high humidity air conditions, especially in the greenhouse due to plant transpiration, and the condensation phenomenon is frequently observed during the cooling process. To evaluate the effect of humidity and condensation on thermal performance, a three dimensional computational fluid dynamic (3D-CFD) model was developed. The distribution of relative humidity in each pipe was investigated, and the impact of inlet air relative humidity on the integrated performance of the earth to air heat exchanger was discussed. The effects of inlet air temperature and volume flow rate were also analyzed. Moreover, the influence of the heat exchanger configurations on the performance of the air condensation was researched. The results indicated that condensation had few effects on the airflow distribution uniformity of the earth to air heat exchanger, while it acted observably on the thermal performance. In addition, humid air in a small diameter pipe tended to condense more easily. Humidity and condensation should be taken into consideration for the design of earth to air heat exchangers in greenhouses during engineering applications.
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4

Ascione, Fabrizio, Laura Bellia et Francesco Minichiello. « Earth-to-air heat exchangers for Italian climates ». Renewable Energy 36, no 8 (août 2011) : 2177–88. http://dx.doi.org/10.1016/j.renene.2011.01.013.

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5

Chiesa, Giacomo. « Climate-potential of earth-to-air heat exchangers ». Energy Procedia 122 (septembre 2017) : 517–22. http://dx.doi.org/10.1016/j.egypro.2017.07.300.

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6

Mihalakakou, Giouli, Manolis Souliotis, Maria Papadaki, George Halkos, John Paravantis, Sofoklis Makridis et Spiros Papaefthimiou. « Applications of earth-to-air heat exchangers : A holistic review ». Renewable and Sustainable Energy Reviews 155 (mars 2022) : 111921. http://dx.doi.org/10.1016/j.rser.2021.111921.

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7

Mihalakakou, G., M. Santamouris et D. Asimakopoulos. « On the cooling potential of earth to air heat exchangers ». Energy Conversion and Management 35, no 5 (mai 1994) : 395–402. http://dx.doi.org/10.1016/0196-8904(94)90098-1.

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8

Mihalakakou, G., M. Santamouris et D. Asimakopoulos. « Modelling the thermal performance of earth-to-air heat exchangers ». Solar Energy 53, no 3 (septembre 1994) : 301–5. http://dx.doi.org/10.1016/0038-092x(94)90636-x.

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9

Chlela, F., A. Husaunndee, P. Riederer et C. Inard. « Numerical Evaluation of Earth to Air Heat Exchangers and Heat Recovery Ventilation Systems ». International Journal of Ventilation 6, no 1 (juin 2007) : 31–42. http://dx.doi.org/10.1080/14733315.2007.11683762.

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10

Basok, Boris, Anatoliy Pavlenko, Aleksandr Nedbailo, Ihor Bozhko, Maryna Novitska, Hanna Koshlak et Myroslav Tkachenk. « Analysis of the Energy Efficiency of the Earth-To-Air Heat Exchanger ». Rocznik Ochrona Środowiska 24 (2022) : 202–13. http://dx.doi.org/10.54740/ros.2022.015.

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This article represents the results of experimental studies of the temperature regime during long-term operation of the earth-to-air heat exchanger. The average annual, total monthly and average daily specific amounts of heat extracted from the soil or released into the soil mass, respectively, depending on the cold or warm periods of the year, were determined. The analysis of the given data allowed to conduct a monthly assessment of the energy efficiency of the use of the earth-to-air heat ex-changer. It is noted that the largest thermal contribution occurs in the middle of the warm and cold periods of the year, when the largest difference in temperature of the outside air and the soil massif is observed. The use of earth-to-air heat exchangers is one of the necessary tools in order to lowering the energy consumption for mod-ern air-conditioning systems of buildings due to their energy efficiency.
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11

D'Agostino, Diana, Concetta Marino et Francesco Minichiello. « The Use of Earth-to-Air and Air-to-Air Heat Exchangers for Different Italian Climates ». International Journal of Heat and Technology 34, S2 (31 octobre 2016) : S287—S294. http://dx.doi.org/10.18280/ijht.34s214.

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D'Agostino, Diana, Concetta Marino et Francesco Minichiello. « The use of earth-to-air and air-to-air heat exchangers for different Italian climates ». International Journal of Heat and Technology 34, Special Issue 2 (30 octobre 2016) : S287—S294. http://dx.doi.org/10.18280/ijht.34sp0214.

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13

Moldovan, Raluca Paula, Gheorghe Viorel Dragoș, Marina Verdeș, Vasilică Ciocan, Marius Costel Bălan et Andrei Burlacu. « Efficient Ways of Turning to Account Geothermal Energy for Heating in Energy Efficient Buildings ». Advanced Engineering Forum 21 (mars 2017) : 437–44. http://dx.doi.org/10.4028/www.scientific.net/aef.21.437.

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Within the present context of the effects of climate changes upon the environment, social and economic framework, but also of the trend of population growth and urban development, ensuring a sustainable, competitive and secure energy development will be possible, primarily, by reducing the negative impact of buildings upon the environment, improving energetic and ecological performances of systems and buildings envelope and promoting renewable sources of energy. In this sense, the paper analyzes, in dynamic simulation regime, performant solutions to reduce the energy consumption for heating energy efficient buildings and greenhouse gas emissions, by harnessing geothermal energy through the use of heat pumps and earth-to-air heat exchangers. The case study starts from an energy efficient building, analyzing the dynamic thermal behavior of the building and then various configurations of earth-to-air heat exchangers in terms of heating potential. For the selection of the optimum solution in terms of coverage of the heating energy demand, different systems combining heat pumps and earth-to-air heat exchangers are studied.
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14

Minaei, Asgar, et Hamed Safikhani. « A new transient analytical model for heat transfer of earth-to-air heat exchangers ». Journal of Building Engineering 33 (janvier 2021) : 101560. http://dx.doi.org/10.1016/j.jobe.2020.101560.

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15

Nedbailo, O., I. Bozhko, M. Tkachenko et S. Andreychuk. « Numerical modelling of parameters of the operational parameters of an earth-to-air heat exchanger for geothermal ventilation ». Ventilation, Illumination and Heat Gas Supply 35 (27 décembre 2020) : 41–48. http://dx.doi.org/10.32347/2409-2606.2020.35.41-48.

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The aim of this work is to develop a numerical model of the year-round operation of an earth-to-air heat exchanger (EAHE) with a circular cross-sectional shape with further its validation based on the obtained experimental data. We consider that these studies can form the basis for the development of methods for calculating and designing geothermal ventilation systems for climate conditions of Ukraine. The analysis of literature sources showed that now there are quite a lot of studies devoted to the issues of geothermal ventilation. The results of such heat exchanger modeling with various geometric data and which operate in their authentic soils under various hydraulic regimes and that are located at different depths are widely presented. However, these studies do not allow obtaining generalized patterns of heat transfer during the operation of the heat exchangers and the influence of the geometric parameters of the heat exchanger on the operation of the geothermal ventilation system as a whole. Much attention is paid to the issues of modelling the operation of such heat exchangers and the distinctive features of each of these models. Also important are the results of experimental studies carried out on our own experimental bench and with the help of which the numerical model was validated. To conduct experimental research on the operation of the geothermal ventilation system at the Institute of Engineering Thermophysics of the National Academy of Sciences of Ukraine an experimental stand was created. This stand is designed to study thermophysical processes during the operation of a geothermal ventilation system elements. The results of these studies are the basis for the development of a method for determining the optimal diameter of the earth-to-air heat exchanger under operating conditions for soil in Kyiv, Ukraine.
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16

Basok, Boris, Ihor Bozhko, Maryna Novitska, Aleksandr Nedbailo et Myroslav Tkachenko. « Numerical Modeling and Experimental Studies of the Operational Parameters of the Earth-To-Air Heat Exchanger of the Geothermal Ventilation System ». Rocznik Ochrona Środowiska 23 (2021) : 42–64. http://dx.doi.org/10.54740/ros.2021.003.

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This article is devoted to the analysis of the heat engineering characteristics of the operation of an Earth-to-Air Heat Exchanger, EAHE, with a circular cross-sectional shape, which is a component of the geothermal ventilation system. The authors analyzed literature sources devoted to the research of heat exchangers of the soil-air type of various designs and for working conditions in various soils. Much attention is paid to the issues of modeling the operation of such heat exchangers and the distinctive features of each of these models. Also important are the results of experimental studies carried out on our own experimental bench and with the help of which the numerical model was validated. The results of these studies are the basis for the development of a method for determining the optimal diameter of an EAHE under operating conditions for soil in Kyiv, Ukraine.
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17

Santamouris, M., G. Mihalakakou, A. Argiriou et D. N. Asimakopoulos. « On the performance of buildings coupled with earth to air heat exchangers ». Solar Energy 54, no 6 (juin 1995) : 375–80. http://dx.doi.org/10.1016/0038-092x(95)00016-k.

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18

Shojaee, Seyed Mohammad Nima, et Kaveh Malek. « Earth-to-air heat exchangers cooling evaluation for different climates of Iran ». Sustainable Energy Technologies and Assessments 23 (octobre 2017) : 111–20. http://dx.doi.org/10.1016/j.seta.2017.09.007.

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19

Chiesa, Giacomo, et Andrew Zajch. « Geo-climatic applicability of earth-to-air heat exchangers in North America ». Energy and Buildings 202 (novembre 2019) : 109332. http://dx.doi.org/10.1016/j.enbuild.2019.109332.

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20

Zhang, Jian, et Fariborz Haghighat. « Convective heat transfer prediction in large rectangular cross-sectional area Earth-to-Air Heat Exchangers ». Building and Environment 44, no 9 (septembre 2009) : 1892–98. http://dx.doi.org/10.1016/j.buildenv.2009.01.011.

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21

Michalak, Piotr. « Impact of Air Density Variation on a Simulated Earth-to-Air Heat Exchanger’s Performance ». Energies 15, no 9 (27 avril 2022) : 3215. http://dx.doi.org/10.3390/en15093215.

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Due to their simple design and reliable operation, earth-to-air heat exchangers (EAHE) are used in modern buildings to reduce ventilation heat losses. EAHE operation in atmospheric conditions results in variation in ambient air temperature and pressure affecting air density. The paper presents the study on the impact of ambient air density variation on the calculated hourly air temperature at the EAHE outlet and the resulting energy use for space heating and cooling of an exemplary residential building. The ground temperature was computed from the model given in EN 16798-5-1. Then, air density was obtained using five various methods. Energy use for space heating and cooling of the building was computed using the 5R1C thermal network model of EN ISO 13790. Depending on the chosen method and concerning the base case without EAHE, a reduction in annual heating and cooling needs was obtained from 7.5% to 8.8% in heating and from 15.3% to 19% in cooling. Annual heating and cooling gain from EAHE were 600.9 kWh and 628.3 kWh for heating and 616.9 kWh and 603.5 kWh forcooling for the Typical Meteorological Years (TMY) and International Weather for Energy Calculation (IWEC) files, respectively. Unit heating and cooling gains per heat exchanger area were from 34.9 kWh/m2 to 36.8 kWh/m2 and from −35.1 kWh/m2 to −36.3 kWh/m2. Density variation with temperature from the relevant typical Polish meteorological year at constant pressure, in comparison to the method of EN 16798-5-1, resulted in an hourly difference of that unit gain up to 4.3 W/m2 and 2.0 W/m2 for heating and cooling, respectively. The same was true inthe case of IWEC files that resulted in differences of 5.5 W/m2 and 1.1 W/m2.
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22

Victoria, Lucas Costa, Vinicius de Freitas Hermes, Joaquim Vaz, Juliana Costi, William Correa Marques, Luiz Alberto Oliveira Rocha, Elizaldo Domingues dos Santos, Michel Kepes Rodrigues, Cesare Biserni et Liércio André Isoldi. « Methodology Allying Standard Penetration Test and Era-Interim Data Set for Numerical Simulations of Earth-Air Heat Exchangers ». Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 76, no 2 (23 octobre 2020) : 43–64. http://dx.doi.org/10.37934/arfmts.76.2.4364.

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Earth-Air Heat Exchangers are devices installed on buildings to reduce electrical energy consumption with air conditioner systems. They consist of buried ducts where the air is blown and induces heat exchange with the surrounding soil. Aiming to develop a consistent numerical simulation approach to study its behavior, this research allies the usage of Standard Penetration Test (SPT) and Era-Interim as part of the computational methodology. The results indicate that the proposed methodology can be adequately adopted, allowing the soil properties assignment from SPT reports, the prescription of inlet air temperature, and soil surface temperature from ERA/Interim data.
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Mihalakakou, G., M. Santamouris, D. Asimakopoulos et N. Papanikolaou. « Impact of ground cover on the efficiencies of earth-to-air heat exchangers ». Applied Energy 48, no 1 (janvier 1994) : 19–32. http://dx.doi.org/10.1016/0306-2619(94)90064-7.

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24

Grosso, M., et L. Raimondo. « Horizontal Air-to-Earth Heat Exchangers in Northern Italy - Testing, Design and Monitoring ». International Journal of Ventilation 7, no 1 (juin 2008) : 1–10. http://dx.doi.org/10.1080/14733315.2008.11683794.

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Brum, Ruth da Silva, Joaquim Vaz, Luiz Alberto Oliveira Rocha, Elizaldo Domingues dos Santos et Liércio André Isoldi. « A new computational modeling to predict the behavior of Earth-Air Heat Exchangers ». Energy and Buildings 64 (septembre 2013) : 395–402. http://dx.doi.org/10.1016/j.enbuild.2013.05.032.

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Deepak, Mr Thakur Aniket, Mr Zinjade Praveen, Mr Shende Bhagyesh Anil, Mrs Purohit Hetal et Mr Satish Silaskar. « A Review Paper on Computational Study of Earth Tube Heat Exchanger System ». International Journal for Research in Applied Science and Engineering Technology 10, no 4 (30 avril 2022) : 2960–64. http://dx.doi.org/10.22214/ijraset.2022.41912.

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Abstract: Earth Tube heat exchanger can be proved as a better substitution to the space heating and HVAC problems that we face in our day to day lives. Earth tube heat exchangers can work in two phases, i.e. as a heater during winter seasons and as a cooler during summer season. ETHE can work more efficiently than traditional HVAC. This project concentrates on computational study of earth tube heat exchanger. The designing calculations were done for appropriate length and area of an earth tube heat exchanger. A model of ETHE was produced on basis of this calculations and dimensions obtained. The model was generated using Solidworks R2021 software. The ETHE model generated was then analysed for thermal stresses, distribution and other parameters. A CFD simulation of model for velocity and flow was carried on. The conclusions obtained show that ETHE works efficiently and can be used as a substitution for traditional HVAC. Keywords: Heating ventilation and air conditioning(HVAC), Earth tube heat exchanger(ETHE), Computational fluid Dynamics (CFD), Efficiently, Thermal stresses.
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27

Oudjehani, N., K. Abahri, A. Tahakourt et Rafik Belarbi. « Evaluation of Earth-Air Heat Exchangers Efficiency in Hot and Dry Climates ». Advanced Materials Research 739 (août 2013) : 318–24. http://dx.doi.org/10.4028/www.scientific.net/amr.739.318.

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Energy efficiency of building, promotes strongly the integration of passive strategies, in order to achieve a thermal comfort especially in summer conditions by reducing or preventing the use of air conditioning systems. In this work, building energy performance has been evaluated using an earth-air heat exchanger (EAHE) during summer period. Energy requirements was analysis by the means of dynamic simulation tools called (TRNSYS) for hot and arid climate in the southern Algeria. This analysis was conducted function of different (such as soil typology, tube material, tube length and depth, ventilation airflow rates). Results show that earth-air heat exchanger has the highest efficiency for arid climates. Furthermore, the possibility of coupling of this technology with other passive strategies (nocturne ventilation and thermal mass) has been also examined. High efficiency was observed.
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Ozgener, Onder, et Leyla Ozgener. « THREE COOLING SEASONS MONITORING OF ENERGETIC PERFORMANCE ANALYSIS OF AN EAHE (EARTH TO AIR HEAT EXCHANGER) ASSISTED SOLAR GREENHOUSE BUILDING ». Journal of Green Building 8, no 2 (avril 2013) : 153–61. http://dx.doi.org/10.3992/jgb.8.2.153.

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In the summer of 2009, the project entitled Utilization of Earth to Air Heat Exchangers for Solar Greenhouses pre Heating and Performance Analysis (UEAHESGHPA) in the Ege University Project No: 09GEE003 was launched. The solar greenhouse building is expected to have an annual cooling load of 12MWh. For decreasing the energy consumption rate of the system the authors suggest a hybrid system, incorporating a solar photovoltaic cell system (PV) assisted Earth-to-Air Heat Exchanger, which was developed in 2010. The principal idea is to use the PVs to meet the electricity expenses of the fan during summer cooling seasons when the required summer peak load cooling can be generated very efficiently and cheaply. The first three cooling seasons were monitored; the results of which were then presented. (See Appendix 1 for nomenclature.)
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Pfafferott, Jens. « Evaluation of earth-to-air heat exchangers with a standardised method to calculate energy efficiency ». Energy and Buildings 35, no 10 (novembre 2003) : 971–83. http://dx.doi.org/10.1016/s0378-7788(03)00055-0.

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Badescu, Viorel, et Alexandru Tudor. « Earth-to-air heat exchangers for passive houses located in South-Eastern European countries ». Journal of Renewable and Sustainable Energy 7, no 4 (juillet 2015) : 043139. http://dx.doi.org/10.1063/1.4928876.

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31

Sakhri, Nasreddine, Younes Menni et Houari Ameur. « Experimental investigation of the performance of earth-to-air heat exchangers in arid environments ». Journal of Arid Environments 180 (septembre 2020) : 104215. http://dx.doi.org/10.1016/j.jaridenv.2020.104215.

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Yang, Dong, Haibin Wei, Jilibo Wang et Miao He. « Coupled heat and moisture transfer model to evaluate earth-to-air heat exchangers exposed to harmonically fluctuating thermal environments ». International Journal of Heat and Mass Transfer 174 (août 2021) : 121293. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2021.121293.

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Greco, Adriana, Edison Gundabattini, Darius Gnanaraj Solomon, Raja Singh Rassiah et Claudia Masselli. « A Review on Geothermal Renewable Energy Systems for Eco-Friendly Air-Conditioning ». Energies 15, no 15 (29 juillet 2022) : 5519. http://dx.doi.org/10.3390/en15155519.

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Nowadays, air conditioning consumes, on average, around one-fifth of the total power used in buildings globally. The present paper aims to provide the present status on the employment of Earth-to-Air Heat eXchangers (EAHX) to contain the consumption of energy and to reduce the effect on the environment in response to the Montreal and Kyoto protocols in a way to achieve cleaner energy production with a low Global Warming Potential (GWP) and a low ozone depletion potential (ODP). Different peculiarities and applications (direct or hybrid) are critically analyzed and reviewed. Specifically, in this paper, the different hybrid applications presented in the literature, where the Earth-to-Air Heat eXchangers are coupled to advanced systems, are reviewed. Finally, an IoT-based EAHX control system plan is reported and discussed to optimize energy efficiency and thermal comfort to suit operating conditions under different time zones.
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Peretti, Clara, Angelo Zarrella, Michele De Carli et Roberto Zecchin. « The design and environmental evaluation of earth-to-air heat exchangers (EAHE). A literature review ». Renewable and Sustainable Energy Reviews 28 (décembre 2013) : 107–16. http://dx.doi.org/10.1016/j.rser.2013.07.057.

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Wei, Haibin, et Dong Yang. « Performance evaluation of flat rectangular earth-to-air heat exchangers in harmonically fluctuating thermal environments ». Applied Thermal Engineering 162 (novembre 2019) : 114262. http://dx.doi.org/10.1016/j.applthermaleng.2019.114262.

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36

Manik, Terang UHSG, Tulus Burhanuddin Sitorus et Mangontang Situmorang. « Performansi Pipa Bersirip Alat Penukar Kalor Udara-Tanah Menggunakan Siklus Terbuka ». Jurnal Sistem Teknik Industri 23, no 1 (29 janvier 2021) : 97–110. http://dx.doi.org/10.32734/jsti.v23i1.5356.

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In heat exchanger analysis using the Earth Air Heat Exchanger method, the overall heat transfer coefficient is known. This tool uses tubes in its design. The weakness of tube and plate type heat exchangers is the relatively low heat transfer coefficient, which can only reach a maximum of 60%. Therefore, a method to improve the heat transfer efficiency is using a fin. The purpose of this study is to calculate and compare the effectiveness (ε) value of experimental and theoretical of the Earth Air Heat Exchanger, as well as to find out the value of the coefficient of performance. The result showed that the average COP value of the experimental result is 0.63 at a speed of 1 m / s, 0.54 at the speed of 2 m / s, and 0.75 at the speed of 3 m / s, while theoretically is 0 , 73 at 1 m / s, 0.57 at 2 m / s, and 0.80 at 3m / s. For the value of the average effectiveness of the experimental results obtained 0.85 at the speed of 1 m / s, 0.93 at the speed of 2 m / s, and 0.89 at the speed of 3 m / s, while the theoretical result is 0.995 at the speed of 1 m / s, 0.997 at 2 m / s, and 0.998 at 3 m / s.
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37

Hepbasli, Arif. « Low exergy modelling and performance analysis of greenhouses coupled to closed earth-to-air heat exchangers (EAHEs) ». Energy and Buildings 64 (septembre 2013) : 224–30. http://dx.doi.org/10.1016/j.enbuild.2013.05.012.

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D'Agostino, Diana, Concetta Marino et Francesco Minichiello. « Earth-to-Air Versus Air-to-Air Heat Exchangers : A Numerical Study on the Energetic, Economic, and Environmental Performances for Italian Office Buildings ». Heat Transfer Engineering 41, no 12 (29 avril 2019) : 1040–51. http://dx.doi.org/10.1080/01457632.2019.1600864.

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Amanowicz, Łukasz, et Janusz Wojtkowiak. « Comparison of Single- and Multipipe Earth-to-Air Heat Exchangers in Terms of Energy Gains and Electricity Consumption : A Case Study for the Temperate Climate of Central Europe ». Energies 14, no 24 (7 décembre 2021) : 8217. http://dx.doi.org/10.3390/en14248217.

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Earth-to-air heat exchangers (EAHEs) can be used in the ventilation systems of various types of buildings. Multipipe structures can be found in large-volume buildings, yet scientific analysis of such systems is rare. Annual energy gains and electricity consumption for equivalent single-pipe and multipipe systems are typically not available. This paper bridges this gap, presenting the results of experimental studies on pressure losses in three-, five- and seven-pipe EAHEs and analysis for the annual energy gains and electric energy consumption as compared to a single-pipe exchanger. The results showed that the multipipe EAHE can be successfully replaced by a single-pipe structure with the same thermal performance and similar pressure losses if a tube with the appropriate diameter is used. However, multipipe heat exchangers can also use pipes of larger diameter (manifolds and/or branches), which improves their energy efficiency and may then make them more advantageous than single-pipe structures. From this reason, ultimately, the final selection of exchanger geometry should take into account economic and environmental issues and also user preferences and their importance in the hierarchy.
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Amanowicz, Łukasz, et Janusz Wojtkowiak. « Experimental investigation and CFD simulation of multi-pipe earth-to-air heat exchangers (EAHEs) flow performance ». E3S Web of Conferences 22 (2017) : 00002. http://dx.doi.org/10.1051/e3sconf/20172200002.

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Badescu, Viorel, et Dragos Isvoranu. « Pneumatic and thermal design procedure and analysis of earth-to-air heat exchangers of registry type ». Applied Energy 88, no 4 (avril 2011) : 1266–80. http://dx.doi.org/10.1016/j.apenergy.2010.10.019.

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Mihalakakou, G., J. O. Lewis et M. Santamouris. « The influence of different ground covers on the heating potential of earth-to-air heat exchangers ». Renewable Energy 7, no 1 (janvier 1996) : 33–46. http://dx.doi.org/10.1016/0960-1481(95)00114-x.

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Bughio, Mushk, Swati Bahale, Waqas Ahmed Mahar et Thorsten Schuetze. « Parametric Performance Analysis of the Cooling Potential of Earth-to-Air Heat Exchangers in Hot and Humid Climates ». Energies 15, no 19 (26 septembre 2022) : 7054. http://dx.doi.org/10.3390/en15197054.

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Earth-to-air heat exchangers (EAHEs) are widely used to reduce the indoor temperature and associated cooling energy demand of buildings. This study investigated the potential reduction in indoor temperatures via energy-efficient ventilation through EAHEs in an existing architectural campus building (ACB) with an energy-efficient renovated building envelope in the hot and humid climate of Karachi, Pakistan. The building information modeling (BIM) program Autodesk Revit was used to develop a virtual ACB BIM model. An EnergyPlus parametric analysis of the ACB BIM model in DesignBuilder facilitated quantification of the influences of operating parameters such as pipe installation depth and pipe diameter for EAHEs with similar total pipe lengths and air-exchange rates on the performance of the EAHEs during the cooling season. A 3 m deep and 0.1 m diameter pipe layout in open space significantly reduces indoor temperature via a specific duct layout in an exemplary ACB. The results show that a pipe diameter above 0.1 m is unsuitable because of the reduction in convective heat transfer due to the increase in the pipe’s surface area and the decrease in pressure in the pipe. The findings of this study can be used to improve the indoor thermal comfort of buildings in climates with comparable properties.
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Amanowicz, Łukasz, et Janusz Wojtkowiak. « Thermal performance of multi-pipe earth-to-air heat exchangers considering the non-uniform distribution of air between parallel pipes ». Geothermics 88 (novembre 2020) : 101896. http://dx.doi.org/10.1016/j.geothermics.2020.101896.

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Baglivo, Cristina, Delia D’Agostino et Paolo Maria Congedo. « Design of a Ventilation System Coupled with a Horizontal Air-Ground Heat Exchanger (HAGHE) for a Residential Building in a Warm Climate ». Energies 11, no 8 (14 août 2018) : 2122. http://dx.doi.org/10.3390/en11082122.

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Energy consumption in new buildings can be reduced at the design stage. This study optimizes the ventilation system design of a new residential building located in a warm climate (Southern Italy). Different system options of horizontal air-ground heat exchangers (HAGHEs), also called earth-to-air heat exchangers (EAHX), have been considered to search for the optimal configuration. The thermal behaviour of the obtained configurations has been modelled by the dynamic simulation software TRNSYS 17. The pipe numbers, the air flow rate, and the soil thermal conductivity are among the simulated building components. For each of them, different design options have been analysed to study how each parameter impacts the building thermal behaviour in winter and summer. The operative air temperature (TOP) has been evaluated inside the building prototype to investigate the indoor comfort. The paper demonstrates that HAGHEs permit to assure a suitable indoor climatization if the building envelope is optimized for a warm area. These conditions require high values of heat storage capacity to keep under control the internal temperature fluctuations, especially in summer. The paper confirms the importance of geothermal systems and design optimization to increase energy savings.
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Ramalho, Jairo Valões de Alencar, Ruth Da Silva Brum, Luiz Alberto Oliveira Rocha, Liércio André Isoldi, Elizaldo Domingues dos Santos et Mariane Sulzbacher. « Fitting new constructal models for the thermal potential of earth-air heat exchangers ». Acta Scientiarum. Technology 40, no 1 (1 janvier 2018) : 30897. http://dx.doi.org/10.4025/actascitechnol.v40i1.30897.

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Relying on the Constructal Design method, this paper introduces new periodic models for the thermal potential of Earth-Air Heat Exchangers (Eahe). As a case study, it analyses the best spacing for three ducts arranged triangularly in order to maximize the heat transfer between soil and air. More specifically, the ratio between the horizontal and vertical spaces among the ducts is set free to vary up to limiting global constraints. This paper aims to better understand how the variations in affect the thermal performance of Eahe. As an additional contribution, some relationships between and the thermal potential of Eahe are mathematically and continuously stated. This allows establishing additional results for the efficiency and energetic performance of Eahe, as well as recommend arrangements in the shape of isosceles triangles with base and height unitary.
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Amanowicz, Łukasz, et Janusz Wojtkowiak. « Validation of CFD model for simulation of multi-pipe earth-to-air heat exchangers (EAHEs) flow performance ». Thermal Science and Engineering Progress 5 (mars 2018) : 44–49. http://dx.doi.org/10.1016/j.tsep.2017.10.018.

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Wei, Haibin, Dong Yang, Jilibo Wang et Jinhui Du. « Field experiments on the cooling capability of earth-to-air heat exchangers in hot and humid climate ». Applied Energy 276 (octobre 2020) : 115493. http://dx.doi.org/10.1016/j.apenergy.2020.115493.

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KARTACHI, YOUNES, et ABDELLAH MECHAQRANE. « NUMERICAL SIMULATION AND PARAMETRIC STUDIES FOR EVALUATION OF BALANCED VENTILATION AND EARTH AIR EXCHANGERS SYSTEM COUPLED TO A DOMESTIC BUILDING ». International Journal of Air-Conditioning and Refrigeration 21, no 01 (mars 2013) : 1350002. http://dx.doi.org/10.1142/s2010132513500028.

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In this study, we analyze the impact of ventilation heat recovery with the heating and cooling potential of earth air heat exchanger in real climatic conditions in domestic buildings in the Middle Atlas region. In our case study, we calculate the primary energy used by a domestic building built as per the conventional house design parameters required by the Moroccan regulation. We use climate data for the city of Fes in Northern Moroccan. Three system configurations were considered. The first was the mechanical extract ventilation system both with and without heat recovery. The second was the mechanical extract ventilation system with earth to air heat exchanger system (EAHEX), and the third system was the mechanical balanced ventilation system coupled with EAHEX system. Primary energy use strongly influences natural resources efficiency and the environmental impacts of energy supply activities. In this study we explore the primary energy implications of the mechanical balanced ventilation system coupled with the EAHEX system in residential buildings. The results of this study shows that the use of a balanced ventilation system, with a high efficiency instead of a mechanical extract ventilation system, decreases the final and primary energy consumption. Moreover, it decreases or increases the CO2 emission depending on the primary energy sources.
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Brum, R. S., J. V. A. Ramalho, Luiz Alberto O. Rocha, L. A. Isoldi et E. D. dos Santos. « Transient Models to Analyze the Influence of the Air Velocity and Ducts Diameter on the Performance of Earth-Air Heat Exchangers ». International Journal of Fluid Mechanics Research 43, no 5-6 (2016) : 503–20. http://dx.doi.org/10.1615/interjfluidmechres.v43.i5-6.100.

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