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Journal articles on the topic 'Heat pump principle'

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Published: 28 June 2021
Last updated: 15 February 2022

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1

Zhang, Jian, Hui Yu Wang, and Jian Zhang. "Study on Principle and Application of Heat Pump Technology." Applied Mechanics and Materials 525 (February 2014): 607–10. http://dx.doi.org/10.4028/www.scientific.net/amm.525.607.

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This paper studies the low temperature heat source heat pumps to improve the efficiency of the heat pump unit with economic principles and the use of compressed improve the working conditions of the compressor, and to explore the system operating mode. A new test run integrated heat pump system is designed. Heat pump system can be controlled by the intelligent control of the implementing agencies, to improve the economic system, the research of this paper can provide a potential basis for the efficient use of energy heat pump.
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2

Sun, Lei, Jia Fu Xiao, Chun Yu Ran, and Li Yun Zhang. "Ground Source Heat Pump and Conventional Heat Sources to Match the Design and Operation Mode for Energy Saving." Advanced Materials Research 724-725 (August 2013): 955–59. http://dx.doi.org/10.4028/www.scientific.net/amr.724-725.955.

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According to China's current energy present situation, the use of renewable energy, saving energy and reducing consumption has become the energy industry development should follow the basic principles. Ground-source heat pump and conventional heat source composite system as a kind of building energy efficiency technology, mainly reflected in soil source heat pump renewable energy utilization aspects. In this paper the soil source heat pump and conventional heat source matching design and operation mode research, from the matching design principle chart, operation mode, the practical engineering application, economic and technical analysis into consideration, it is concluded that the soil source heat pump and conventional heat source composite system can be applied and research.
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3

Kłosowiak, R., J. Bartoszewicz, and R. Urbaniak. "Portable Heat Pump Testing Device." International Journal of Applied Mechanics and Engineering 20, no. 3 (August 1, 2015): 657–62. http://dx.doi.org/10.1515/ijame-2015-0044.

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Abstract The aim of this paper is to present the design and working principle of a portable testing device for heat pumps in the energy recirculation system. The presented test stand can be used for any refrigerating/reverse flow cycle device to calculate the device energy balance. The equipment is made of two portable containers of the capacity of 250 liters to simulate the air heat source and ground heat source with a system of temperature stabilization, compressor heat pump of the coefficient of performance (COP) of = 4.3, a failsafe system and a control and measurement system.
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4

Zhang, Cheng Hu, Na Meng, and De Xing Sun. "Sewage Anti-Blocking Machine Principle and Double-Stage Pump Technology." Advanced Materials Research 424-425 (January 2012): 751–55. http://dx.doi.org/10.4028/www.scientific.net/amr.424-425.751.

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The sewage should be filtered to prevent the blockage of the heat exchanger before using. And the anti-blocking machine is the key device to prevent blocking in sewage source heat pump system. The paper introduces the development of the anti-blocking machine: intermittent backwashing, flat continuous backing, cylindrical with external baffle continuous backwashing, double-stage continuous backwashing without external baffle. Also, it describes the principle of the anti-blocking machine, the key technologies and the necessity of choosing double-stage pump in sewage source heat pump system with anti-blocking machine. The paper concludes the technical characteristics, the advantages and disadvantages of the double-stage sewage source heat pump system and introduces the selecting principle of the double-stage pump. The paper clarifies some misunderstanding about anti-blocking machine and double-stage pump.
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5

Zhao, Jing Bo. "Comprehensive Utilization of Solar Assisted Heat Pump and Ground Source Heat Pump in Severe Cold Region." Applied Mechanics and Materials 448-453 (October 2013): 2790–93. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.2790.

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In this paper, the principle of solar assisted heat pump and ground source heat pump was introduced, the comprehensive utilization of solar assisted heat pump and ground source heat pump was discussed in severe cold region, the article illustrated the advantages and matters of the system to which need pay attention, and pointed out that the comprehensive utilization of the combination solar assisted heat pump and ground source heat pump had a substantial economic and environmental benefits in severe cold region.
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6

Gong, Peng, and Jian Tang. "The Economic Performance of Ground-Source Heat Pumps." Advanced Materials Research 919-921 (April 2014): 1735–38. http://dx.doi.org/10.4028/www.scientific.net/amr.919-921.1735.

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Ground-Source Heat Pump (PSHP) was verified by US Environmental Protection Agency (EPA) as one of the most efficient air conditioning systems on present market. It has a higher efficiency than other heating systems from 50% to 70%, and a higher efficiency than other cooling systems from 30% to 50%. The working principle of PSHP determines its low operating costs. By comparing the total energy efficiency, the existing groundwater heat pump total energy efficiency is the highest, about 115%. The total energy efficiency for soil-source heat pump is up to 100%. But traditional air conditioning is far less than the level. Articles present a research on Ground-Source Heat Pump system and its cost with a scientific and objective principles. Ground-source heat pump is a new central air conditioning system of Low-carbon energy saving. Due to the high technical content, function requirement, and installation difficulty , the average initial investment of ground-source heat pump is much higher than traditional central air conditioning. Taking into account the added costs of heating systems based on traditional central air-conditioning, such as boilers, it will not deviate too much from it.
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7

Qian, Jian Feng, and Ya Yuan Liu. "Characteristics Study of Sewage Source Heat Pump System Based on Heat Transfer Enhancement and Acoustic Cavitation Decontamination." Applied Mechanics and Materials 665 (October 2014): 607–10. http://dx.doi.org/10.4028/www.scientific.net/amm.665.607.

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Put forward an application of ultrasonic cavitation technology of the sewage source heat pump system to solve the problem of controlling pollution and emphatically discusses the principle of acoustic cavitation and the effect, to conduct a feasibility analysis of Anti-fouling in sewage source heat pump sewage side. Through analysis principle of ultrasonic cavitation and heat transfer enhancement for carrying the experiment, study the pattern of scaling in heat exchange tube for different velocity and viscosity, effect in flow rate on the ultrasonic cleaning wastewater, Effect in ultrasonic treatment time on the descaling result. Obtain that it can enhancement transfer for 48%.
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8

Duan, Rui. "Study on Performance of Air Source Heat Pump Water Heater." Advanced Materials Research 608-609 (December 2012): 987–93. http://dx.doi.org/10.4028/www.scientific.net/amr.608-609.987.

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This paper introduce the working principle and classification of air source heat pump water heater. Thermodynamic calculation of the air source heat pump water heater is carried out, such as air source heat pump water heating coefficient, energy saving effect, and the cooling effect of the surrounding environment, and primary energy utilization of heating conditions of several forms. The primary energy utilization rate of air source heat pump water heater is the highest, and showing a good energy-saving.
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9

Fritz, Vincent A., Harold A. Cloud, Robert F. Deef, and Alicia M. Borowski. "A Versatile Heat Pump Seed Dryer." HortScience 25, no. 8 (August 1990): 977–78. http://dx.doi.org/10.21273/hortsci.25.8.977.

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An experimental research seed dryer based on the heat pump principle was built to dry sweet corn (Zea mays var. rugosa L.) seed on husked ears. The dryer is not susceptible to environmentally induced drying rate fluctuations that are common with a conventional open-system forced-air oven. The dryer operates as a closed system and, as a result, provides a more constant drying environment. The ability to control air flow, temperature, and humidity makes the dryer a valuable tool for seed production research.
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10

Liu, Tao, Zhi Gang Zhang, and Wei Zhang. "Economic Analysis of Solar Energy/Air Compound Source Heat Pump System." Applied Mechanics and Materials 130-134 (October 2011): 1605–8. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.1605.

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The foundation, principle and prior condition and engineering economic Evaluation Criteria of engineering economic analysis are introduced. The economy for a solar energy/air source heat pump system is analyzed. Through a single air-cooled heat pump system, air conditioning in summer + winter heating systems, solar / air source compound heat pump system model analysis and comparison of three systems, integrated initial investment and running costs of both, come to solar / air source compound heat pump system has certain advantages in economical efficiency.
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11

Serey, Nicolas, Darem Ahmad, and Hussam Jouhara. "Air-to-air heat pump: review of recent advances and future potential." E3S Web of Conferences 116 (2019): 00074. http://dx.doi.org/10.1051/e3sconf/201911600074.

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As the demand for energy is increasing and due to more focus on the utilization of low impact energy heat sources, heat pumps are a renewable energy technology that transfers thermal energy from one place to another. Heat pumps are used in various applications such as space heating, space cooling, heating water and many others. Heat pumps have many configurations but in essence they compose of components which are found in all units. The framework for 2030 climate and energy policy has decided that greenhouse emissions must be reduced by 40%. This has therefore, increased the need to utilize low grade energy. Heat pumps have the capability to utilize the upgrade of low grade energy and reuse it within any domestic and industrial application. This paper will explain the working principle of an air-to-air heat pump, describing the different configurations, and evaluate the performance of such systems.
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12

Li, Yun, and Kai Song. "Economic Analysis of the Absorption Heat Pump in Supercritical Unit." Applied Mechanics and Materials 291-294 (February 2013): 1666–69. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.1666.

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As an effective energy-saving device, the heat pump is environmentally friendly and advantageous in the recovery of low-temperature and middle-temperature waste heat. So it is increasingly being used in practical applications. The circulating water which is produced by power plants has a large number of low-temperature waste heat. It will bring huge economic and environmental benefits by using heat pump technology to recover those waste heat energy. The application of the heat pump in supercritical unit is discussed as the example of central heating project using waste heat in a power plant. And the basic principle of absorption heat pump is introduced. The economy, energy conservation and environmental benefits of lithium bromide absorption heat pump are also analyzed when it is used in 600MW supercritical unit.
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13

Yu, Ying. "Design of a Composite Cold and Heat Source System of Air Conditioning Based on Ground Source Heat Pump (GSHP)." Advanced Materials Research 374-377 (October 2011): 649–54. http://dx.doi.org/10.4028/www.scientific.net/amr.374-377.649.

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For the air conditioning system of a modern building, the paper proposes a design method of composite cold and heat sources system based on the ground source heat pump. The author describes the design principle of this system, the design of ground heat exchanger system and the control of soil heat pump system etc. Through the actual measurement, this design greatly reduces power consumption and can be used as references for future applications.
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14

Lang, Jiaqi, Chundong Hu, Yuanlai Xie, and Yunhua Tong. "Optimization Analysis of the Structural Design of NNBI Cryosorption Pumps." Energies 14, no. 12 (June 18, 2021): 3628. http://dx.doi.org/10.3390/en14123628.

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Cryosorption pumps create a vacuum by adsorbing gas at low temperature through porous solid adsorbents. The transmission probability of gas molecules and heat loads of cryosorption pumps are important factors affecting its performance. Herein, Molflow software based on the Monte Carlo principle is used to analyze the effects of the structural design of cryosorption pumps on transmission probability. The influence of structural design on radiation heat transfer is analyzed by ANSYS Steady-State Thermal software. This provides a reference for the design of a cryosorption pump to validate the prototype of a neutral beam injector for the China Engineering Fusion Experimental Reactor (CFETR).
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15

Chen, Ao Xue, Zhao Chen, Chun Yu Ran, and Chun Qing Wang. "Application Analysis of the Recovery Fresh Air Heat Pump Units in Energy Saving Reform of Air Conditioning in the Severe Cold Regions." Advanced Materials Research 1092-1093 (March 2015): 12–16. http://dx.doi.org/10.4028/www.scientific.net/amr.1092-1093.12.

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This article introduces the working principle of the recovery fresh air heat pump units,and analyzes the applications system which units apply in air-conditioning heat recovery system.By using the principle of regression analysis of mathematical statistics,the article measured data for statistical analysis.The regression equation is established, the established regression equation has a high prediction accuracy.
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16

Ma, Rui Hua. "Research on Application of Air Source Heat Pump Hot Water System in Energy Saving Building." Applied Mechanics and Materials 700 (December 2014): 189–92. http://dx.doi.org/10.4028/www.scientific.net/amm.700.189.

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Air source heat pump hot water system is a kind of high efficient energy saving technology model, and it has no pollution to the environment. In this paper, a bathroom of one college in Panzhihua area is researched as a project example, and the working principle of air source heat pump hot water system is introduced, furthermore, the system benefit is analyzed. The result proves the air source heat pump hot water system has good economic benefits, energy saving and environmental protection benefits, and it has a broad development space and application prospect in building energy saving.
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17

Fu, Su Hong, Dong Sheng Zhang, and Wei Hua Zhang. "Design of a New Type Low Heating Vapor Recovery Pump." Advanced Materials Research 706-708 (June 2013): 1274–77. http://dx.doi.org/10.4028/www.scientific.net/amr.706-708.1274.

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In order to solve the problem of high-heating and motor burning for the vapor recovery pump, this paper designs a low heating pump with some radiating mechanical measures, which are improving the structure of the flame arrester, using PTFE diaphragm and adding the heat sink. The structure and the operating principle of the pump are given. All indicated that the flame arrester has a reasonable structure, can effectively improve the inlet and outlet exhaust efficiency. And by using PTFE diaphragm and the heat sink, the friction of the piston and the piston cavity is reduced and the heat dissipating efficiency is increased.
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18

Zhang, Wei. "Application of Water-Intake Methods on Open-Loop Surface Water Source Heat Pump." Applied Mechanics and Materials 548-549 (April 2014): 588–91. http://dx.doi.org/10.4028/www.scientific.net/amm.548-549.588.

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Natural conditions are conducive to the application of surface water source heat pump technology in Chongqing, and the application of open-loop surface water source heat pump system is more common than the close-loop style. Introduces the ultimate principle of the Water percolation and Water-intake directly method, and corresponding with the actual case, makes comparison and analysis to the main factors considered in the selection of water-intake methods.
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19

Prokopov, M., S. Sharapov, Yu Merzlyakov, and D. Gusev. "The energy efficiency concept and implementation prospects of the jet thermocompression principle in small heat energy." Energy and automation, no. 2(54) (June 22, 2021): 39–51. http://dx.doi.org/10.31548/energiya2021.02.039.

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The expediency of the implementation of the principle of steam thermal compression to improve the energy efficiency of sources of electricity and heat supply of small heat power engineering is substantiated. The results of thermodynamic analysis and numerical optimization of the parameters of the compressor steam-turbine cycle of a small cogeneration power plant are presented. A jet step-down thermotransformer has been tested - as an alternative to traditional boiler heating. On the basis of the conducted thermodynamic analysis, a new combined cycle of a step-down thermotransformer has been developed, which ensures efficient conversion of the supplied energy (mainly in the form of fuel heat) into the heat carrier flow of the heat supply system with the required temperature level 50 ... 90 °C). The fundamental difference between the considered thermal transformer and steam compressor heat pumps is the replacement of a mechanical compressor with a steam thermocompressor module (STC-unit). The working process in the STK-module is realized by using the liquid phase of the refrigerant, which boils up during expiration, subcooled to saturation, as an active medium of a jet compressor. Injection of steam from the evaporator is provided due to the fine-dispersed vapor-droplet structure formed in the outlet section of the active flow nozzle. A program for the numerical study of the working process of a step-down thermal transformer was prepared and tested, on the basis of which multivariate calculations were carried out. On the basis of computational studies, the area of achievable indicators of the proposed heat supply system has been established; the area of initial operating parameters corresponding to the maximum values of the conversion coefficient and exergy efficiency was determined; comparative indicators of the main parameters of the investigated thermal transformer on various working substances in the range of operating modes as a heat pump or a refrigerating machine were obtained. Key words: workflow, steam thermocompressor, step-down thermotransformer, energy efficiency, heat pump mode
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20

Zhang, W., L. Chen, and F. Sun. "Thermodynamic optimization principle for open inverse Brayton cycle (refrigeration/heat pump cycle)." Scientia Iranica 19, no. 6 (December 2012): 1638–52. http://dx.doi.org/10.1016/j.scient.2012.09.007.

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21

Liu, Zhi Bin, Ji Li Zhang, and Liang Dong Ma. "Design and Research on One Avoiding-Clogging Equipment in Untreated Sewage Heat Pump Air Conditioning System." Applied Mechanics and Materials 204-208 (October 2012): 4378–83. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.4378.

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Appling urban untreated sewage as a cool and heat source of the heat pump air conditioning system is considered to be an effective way to develop urban sewage resource and a critical technique to serve the building energy system.Applications of technical difficulties are to solve the jam on sewage dirt to tube of heat exchanger and pipes. The multi-filter surface backwash technology is used to separate the suspended solids from the sewage and clean the dirt on the grille. By describing the filtration technique in the sewage source heat pump system to introduce the principle of operation and control process of the multi-filter surface backwash technology. By using in commercialese, the technology is proved to be feasible and reliability. These methods could serve as a reference for designing and application untreated sewage source heat pump systems.
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22

Jiang, Ai Guo, and Xiao Zhong Wang. "Experimental Investigation of a Multifunctional Solar Assisted Heat Pump in Space Cooling Integrated Water Heating Mode and Space Cooling only Mode." Applied Mechanics and Materials 80-81 (July 2011): 904–8. http://dx.doi.org/10.4028/www.scientific.net/amm.80-81.904.

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A prototype of a Multifunctional Solar Assisted Heat Pump (MSAHP) system is designed in the study. The system integrates a heat pump water heater, a conventional air-conditioning unit and a solar water heater, and takes advantage of their multiple functions in terms of solar and heat pump water heating, space cooling only, space cooling integrated water heating, and air-source/water-source heat pump space heating. The principle and different operating modes of the system are presented. The experimental study of the prototype of the MSAHP in the space cooling integrated water heating mode was conducted. The results indicate that the combined energy efficiency ratio (EERc) of the system fluctuated between 3.39 and 6.20 in this mode. Experiment was also conducted to test the relevant performance functions of the system in the space cooling only mode. The results show that the energy efficiency ratio (EER) of space cooling only mode is 2.61.
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23

Li, Hui Xing, Peng Cheng, Guo Hui Feng, and Ran Zhang. "Research on Composite System of Solar Energy Reclaimed Water Heat Pump and Phase Change Energy Storage." Applied Mechanics and Materials 521 (February 2014): 56–59. http://dx.doi.org/10.4028/www.scientific.net/amm.521.56.

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New energy development and utilization is an important approach to solve the problem of energy shortage,a new type of composite heating system is proposed in this study. It expounds the research ideas, the technical principle and operation plan of the system. Through a comparative analysis of the performance coefficient of composite heating system, reclaimed water source heat pump system and solar hot water heating system, it Comes to the conclusions that the composite heating system can not only reduce the operating cost but also improve the running performance of reclaimed water source heat pump and reduce the heat loss of solar hot water heating system.
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24

Härkönen, M., and A. Aittomäki. "The principle of internal regeneration as applied to the adsorption heat pump process." Heat Recovery Systems and CHP 11, no. 4 (January 1991): 239–48. http://dx.doi.org/10.1016/0890-4332(91)90069-g.

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25

Arsenyev, Vyacheslav, Sergej Vanyeyev, Mykhail Protsenko, and Alexander Gulyi. "Heat Pump Unit Based on Principle of Stream Thermocompression Using Water-Ammonia Solution." Procedia Engineering 39 (2012): 254–60. http://dx.doi.org/10.1016/j.proeng.2012.07.032.

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26

Zhang, Cheng Hu, Na Meng, and De Xing Sun. "Anti-Blocking Technology for Urban Sewage Source Heat Pump System." Advanced Materials Research 472-475 (February 2012): 637–40. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.637.

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The extremely poor sewage quality could make the sewage heat utilization difficult. The paper introduces the content and distribution property of the sewage dirt. For the dirt properties and project experience, it proposes the two basic points of the anti-blocking technique in sewage source heat pump system: filtering surface continuous regeneration and dirt continuous reduction and the request for filtering pore size parameters. It also describes the principle of filtering surface hydraulic continuous regenerative technique and establishes its mathematical model and design method of the device. The calculation and application result indicates that filtering surface hydraulic continuous regenerative technique can guarantee the filtering effect and operation flow stable.
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27

Peng, Yunhui, Yuanzhou Zheng, Tongyao Miao, Peiru Zhou, Yangshi Shao, Liang Li, Lingzhi Feng, Zheng Fang, and Zhang Yang. "Small seawater desalination system based on loop heat pipe principle." E3S Web of Conferences 118 (2019): 02034. http://dx.doi.org/10.1051/e3sconf/201911802034.

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The small seawater desalination system based on loop heat pipe principle by using plate capillary pump technology, a new type of radiator spoiler evaporator and soaking plate finned condenser to realize desktop-class solar seawater desalination system. The Venturi tube principle is used to reduce the internal pressure and energy consumption, and solar photoelectric board with electric heating board function is used to solve problems for areas where there is a shortage of electricity and fresh water resources. Full automatic control system is used to realize the full automatic operation of the equipment.Desktop-class light and small seawater desalination equipment enjoys a broad market prospect. It can not only be used in islands, fishing boats, offshore operating platforms and other complex working scenarios, but also can be used as a large ship freshwater resources emergency equipment.
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28

Zhang, Hong Chen, Hong Tao Wang, Feng Li Li, and Li Qing Zhang. "Experimental Investigation and the Development of Phase Change Heat Storage Device Adapted to the Solar Energy Heat Pump." Advanced Materials Research 860-863 (December 2013): 191–95. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.191.

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on the basis of the working principle of solar heat pump system is introduced in this paper, Focuses on the structure of the heat storage device and the selection of phase change materials, structure, The influence of phase change materials the size of the diameter to heat-exchange, The influence of phase change materials piled up form to heat-exchange, The influence of thermal fluid flow velocity to heat exchange , In-depth analysis of phase change materials and thermal fluid accumulation of heat and heat release process , Solve the problem of supercooling and dialysis of phase change heat storage materials, The use of phase change materials have a positive reference value.
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29

Qi, Feng He, Yan Qin Wang, Chun Yu Xiong, and Feng Cui. "Research of Collection and Conversion Device of Screw Pump Motor Heat Energy Based on LTC3108." Advanced Materials Research 753-755 (August 2013): 2553–56. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.2553.

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Designed thermal collector conversion device based on the principle of thermoelectric power generation. This device used the LTC3108 module which was low input voltage boost converter. The device can convert the heat from the screw pump working into electricity. The electricity can be powered microprocessors and sensors.
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30

Pozsa, Ákos, Tamás Illés, Károly Marcell Mészáros, Norbert Szaszák, and Péter Bencs. "Design of a Heat Pump Based Heater and Dehumidifier Device." Jelenkori Társadalmi és Gazdasági Folyamatok 14, no. 1 (March 15, 2019): 111–21. http://dx.doi.org/10.14232/jtgf.2019.1.111-121.

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Many residential building use electrical heaters mainly in bathrooms, even as a supplement heating device. These devices typically operate at very high efficiency, since in most cases, electrical current is converted into Joule-heat by means of electrical resistances. The humidity of the air in bathrooms is often very high. Therefore, it would be useful to apply such heating devices, which not only increase the temperature of the air, but also reduces the absolute humidity of it. If a heat pump is used for heating purposes where both the heat absorber and the heat exchanger are placed in the same airspace, condensation occurs at a temperature below the dew point of the given air condition at the point of heat extraction thus some of the humidity precipitates. Along with this the absolute humidity of the air can be reduced (which is also recommended for hygiene reasons). Furthermore, due to the latent heat released during the condensation a significant excess of heat appears on the heat exchanger, increasing the heating efficiency over 100%. The design and operation of a heat pump heater operating on such a principle is described in this study, addressing the typical air-conditioning parameters, correlations, calculations performed for the design.
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31

Fu, Zhendong, Jianyin Miao, Qi Wu, and Hongyang Zheng. "Analytical Study on Gas-Oil Separation of a Heat Pump System under Lunar Gravity." Advances in Mechanical Engineering 12, no. 10 (October 2020): 168781402096640. http://dx.doi.org/10.1177/1687814020966408.

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A heat pump in the aerospace industry can significantly reduce the area of radiator by elevating the rejection temperature. Especially for a Lunar base, the heat pump can improve the heat rejection capability of the thermal control system to adapt the high-temperature environment. However, gravity on the Lunar (about 1/6 g) may have an adverse impact on a gas-oil separator of the heat pump, and solving this problem is the key for a heat pump used on Lunar base. At present, the gas-oil separator all based on gravity separation theories, the researches under low or micro gravity were blank. In this work, a gravity separation model based on a single-particle principle was built, and the effects of the vapor velocity, the oil droplet initial velocity, and the oil droplet diameter were investigated under normal gravity. Then the variations of the separation efficiency under Lunar gravity were discussed and the numerical calculation results showed that the separation efficiency was reduced when the vapor velocity or droplet initial velocity increased in a certain height of the separator whenever under normal or Lunar gravity. Particularly, the separation efficiency under Lunar gravity was reduced from 99% to 55% than it under normal gravity.
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32

Hu, Hong Song, Fang Wang, Jian Zhong Yu, and Wu Hao. "The Experimental Study of Thermodynamic Performance on R407C Air-Conditioner Hot Water Combined Unit." Key Engineering Materials 467-469 (February 2011): 549–53. http://dx.doi.org/10.4028/www.scientific.net/kem.467-469.549.

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This paper analysis on the design and the test of an air-conditioner hot water combined unit using environmental friendly refrigerant R407C. Firstly the research status of the system is elaborated for air-source heat pump water heater simply. Then the principle and structure are described on an air-conditioner heat pump followed by a water heater at different running modes and different operation conditions. The hot water experiments of the unit in three seasons have been tested and researched in a multi-functional environmental chamber. Some analysis of the unit’s thermodynamic performance is carried out from the test data for improving such kind of machine afterward.
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33

Gu, Ya Xiu, Tian Wang, Wei Liu, and Feng Feng Ma. "Energy-Saving Analysis and Heat Transfer Performance of Wastewater Source Heat Pump." Applied Mechanics and Materials 694 (November 2014): 211–17. http://dx.doi.org/10.4028/www.scientific.net/amm.694.211.

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There is a large potential in the heat loss from the urban wastewater. In all kinds of low-grade heat sources, urban wastewater is gradually widely used because of its advantages such as huge quantities, small variation of temperature, warm in winter and cool in summer, etc. By integrating a heat pump to utilize this heat, the wastewater source heat pump (WWSHP), which is a new water reuse and treatment strategy to tackle the water problems of China and to realize the sustainable development, recovers the heat of wastewater. The WWSHP air conditioning system as residential application can reduce the need of energy systems based on fossil fuel for cooling, heating, and hot water's supply purposes. The system's working principle, classification and the wastewater's characteristic parameters were discussed in this paper. And the scheme of using WWSHP system for central air-conditioning compared with other refrigerating and heating equipments was analyzed in detail. The investigation into COP (Coefficient of Performance) and PER (Primary Energy Ratio) was shown in this paper. Among the four kinds of common air conditioning units, when the loads are same respectively, the WWSHP has the most significant energy-saving effect. Furthermore, mechanism of heat transfer enhancement for falling-film evaporation and condensation surface of tubes packed with wire-mesh is also studied in detail. Theoretical simulation will be carried out for the heat transfer process and the flow of falling-film outside horizontal tubes. Improvement of controlling parameters influenced the evaporation and condensation performance, and then led to an increase in the refrigerating quantity and the COP. Consequently, this WWSHP system has its theoretical significance and promising engineering application potentials for the residential refrigerating and air-conditioning system using low-temperature waste heat source.
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34

Yuan, Zhi Yang. "Research on the Application of GSHP (Ground Source Heat Pump) Technology with Composite Properties of Biochemical Materials." Advanced Materials Research 643 (January 2013): 3–8. http://dx.doi.org/10.4028/www.scientific.net/amr.643.3.

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This paper describes the principle, classification and application significance of GSHP (Ground Source Heat Pump) technology with Composite Properties of Biochemical Materials and analyzes its characteristics and economic benefits. Then its development history and domestic research status are introduced to present its broad prospects in China’s energy conservation, environmental protection and sustainable development
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35

Tang, Rui Chao, Zhi Tao Han, Er Kang Zhang, Shu Guang Liu, Hai Quan Zhang, Yu Chang Su, and Song Qing Wang. "Experimental Study on Characteristics of False Defrosting for Split Air Source Heat Pump." Applied Mechanics and Materials 220-223 (November 2012): 585–91. http://dx.doi.org/10.4028/www.scientific.net/amm.220-223.585.

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Detailed experimental study on the characteristics of false defrosting of a split type air-source heat pump (ASHP) has been made. The results show that the false defrosting is seriously detrimental to ASHP by comparing varied parameters of compressor such as shaft power, suction and discharge pressure, etc. in normal defrosting and false defrosting. This paper also analyzes a common defrosting control method for air conditioner of split ASHP room, i.e., with two temperature sensors set on indoor heat exchanger, the operating principle thereof and drawbacks in terms of causing false defrosting.
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36

Liu, Zhen Dong, Fang Wang, Yong Li Chen, Huo Wu, Chen Lu, and Ji Hua Zhang. "Energy-Saving Design for a Composite Heating Water System from Kitchen Waste Heat and Solar Energy." Applied Mechanics and Materials 446-447 (November 2013): 1498–501. http://dx.doi.org/10.4028/www.scientific.net/amm.446-447.1498.

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This paper proposed an energy-saving system which combination solar collectors for heating water system with heat pipe heat exchanger to recover kitchen waste heat. Its working principle is using heat pipe exchangers exhaust heat to warm the cold water from water storage tank, and during the day, take advantage of solar collectors to help heat pipe heat exchanger heating the water. In this design, the heat exchanger tank and the heat storage tank arranged independently, water tank associated control system was provided with automatic temperature regulator to control the opening and stopping of the pump. This system made full use of kitchen waste heat and solar to meet the kitchen cooking and cleaning process hot water supply needs.
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37

Yang, Jie, Jing Lv, Da Zhang Yang, Kang Liu, Song Bo Zhang, and Hui Xia Lu. "Supercritical Carbon Dioxide Heat Exchanger Tube Numerical Simulation and Analysis." Advanced Materials Research 366 (October 2011): 7–11. http://dx.doi.org/10.4028/www.scientific.net/amr.366.7.

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In this paper, the three straight casing tubes and the double helix casing tubes were modeled using the Gambit software. And the fluid flowing in tubes was simulated by Fluent software. According to the simulation results, with the field synergy principle, two casing tubes’ flow and temperature distribution of carbon dioxide and water have been analyzed. Simulation data show that the double helix casing tubes is better than the three straight casing tubes on heat transfer and synergy. Lay the good foundation for design optimization and efficiency of heat exchanger of carbon dioxide heat pump system.
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38

ENDO, Naoki, Tetsuhiko MAEDA, Yasuo HASEGAWA, and Iwao YAMASHITA. "A Compressor Using Liquid Piston for Heat Pump : Principle for operation and subjects for development." Proceedings of the Thermal Engineering Conference 2003 (2003): 367–68. http://dx.doi.org/10.1299/jsmeted.2003.367.

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39

Zhang, Hua, and Hui Zhang. "Application of the Hybrid System of Solar Energy and Geothermal Heat Pump in Buildings." Advanced Materials Research 374-377 (October 2011): 137–40. http://dx.doi.org/10.4028/www.scientific.net/amr.374-377.137.

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The hybrid system of solar energy and geothermal heat pump (GHP) can put the advantages of the two renewable energy sources together and make up the deficiencies of each other. The concept and the development of the hybrid system are introduced; the work principle and the operational mode of the system are analyzed. Through the introduction of two instances, this paper analyzes the way of the system in buildings and the saving potential applying the hybrid system.
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40

Arsenyev, Vyacheslav, Victor Kozin, Iurii Merzliakov, and Mikhail Protsenko. "Jet Thermal Compression of the Ammonia-Water Mixture for Heat Pumps and Refrigerating Systems." Applied Mechanics and Materials 630 (September 2014): 61–65. http://dx.doi.org/10.4028/www.scientific.net/amm.630.61.

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The potential and features of thermotransformer operation has been investigated with the employment of jet thermal compression in heat pump or refrigeration cycles. Jet thermal principle is realized by means of injection and compression of the low-pressure steam with the help of working steam jet. It is formed with the help of relaxation vaporization of the subcooled liquid inside motive flow duct of jet compressor instead of the conventional mechanical compressor. It is a part of the jet thermal compression module which includes a liquid-vapor jet compressor, a separator, a pump and a heater. Perspective of application the ammonia-water mixture as working substance is determined by its high thermodynamic and environmental properties, possibility to maintain higher condensation temperatures than when using CFC, HCFC and HFC chemicals.
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41

Wu, Lingmin, and Mingquan Bao. "Solar thermal control system based on variable frequency heat exchanger control technology." Thermal Science 25, no. 4 Part B (2021): 3063–71. http://dx.doi.org/10.2298/tsci2104063w.

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Frequency conversion exchanger control is the critical technology of solar water heaters. It can integrate solar thermal technology and heat pump technology and makes solar thermal energy conversion efficiency higher. Based on this research background, the paper first discusses the principle of the technology. Then, it optimizes the system control strategy based on maximizing the utilization of heat energy and the highest efficiency ratio. Finally, the article established a deep learning model of solar radiation based on different time-sharing. The experimental simulation confirmed that the thermal energy control optimization algorithm model proposed in this paper could effectively predict thermal energy exchange.
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42

Sun, Fang Tian, Na Wang, Yun Ze Fan, and De Ying Li. "Research on Waste Heat Recovery in Drain Water of Barbershop." Applied Mechanics and Materials 204-208 (October 2012): 4229–33. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.4229.

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Drain water at 35°C was directly discharged into sewer in most of barbershop with Electric water heater. Heat utilization efficiency is lower, and energy grade match between input and output is not appropriate in most of barbershops. Two waste heat recovery systems were presented according to the heat utilization characteristics of barbershops and principle of cascade utilization of energy. One was the waste heat recovery system by water-to-water heat exchanger (WHR-HE), and the other is the waste heat recovery system by water-to-water heat exchanger and high-temperature heat pump (WHR-CHEHP). The two heat recovery systems were analyzed by the first and second Laws of thermodynamic. The analyzed results show that the energy consumption can be reduced about 75% for HR-HE, and about 98% for WHR-CHEHP. Both WHR-HE and WHR-CHEHP are with better energy-saving effect and economic benefits.
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43

Ahmed, Kaiser, Jevgeni Fadejev, and Jarek Kurnitski. "Modeling an Alternate Operational Ground Source Heat Pump for Combined Space Heating and Domestic Hot Water Power Sizing." Energies 12, no. 11 (June 3, 2019): 2120. http://dx.doi.org/10.3390/en12112120.

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This study developed an alternate operational control system for ground source heat pumps (GSHP), which was applied to determine combined space heating and domestic hot water (DHW) power equations at design temperature. A domestic GSHP with an alternate control system was implemented in a whole building simulation model following the heat deficiency for space heating based on degree minute counting. A simulated GSHP system with 200 L storage tank resulted in 13%–26% power reduction compared to the calculation of the same system with existing European standards, which required separate space heating and DHW power calculation. The periodic operation utilized the thermal mass of the building with the same effect in the case of light and heavy-weight building because of the very short cycle of 30 min. Room temperatures dropped during the DHW heating cycle but kept within comfort range. The developed equations predict the total power as a function of occupancy, peak and average DHW consumption with variations of 0%–2.2% compared to the simulated results. DHW heating added the total power in modern low energy buildings by 21%–41% and 13%–26% at design temperatures of −15 °C and −26 °C, respectively. Internal heat gains reduced the power so that the reduction effect compensated the effect of DHW heating in the case of a house occupied by three people. The equations could be used for power sizing of any heat pump types, which has alternate operation principle and hydronic heating system.
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44

Tikhomirov, Dmitriy, Stanislav Trunov, Aleksey Kuzmichev, and Nicolay Lamonov. "The Principle of Building an Energy-Saving Drying Plant Using Thermoelectricity." Elektrotekhnologii i elektrooborudovanie v APK 1, no. 42 (January 2021): 16–22. http://dx.doi.org/10.22314/2658-4859-2021-68-1-16-22.

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Most drying plants of small capacity for vegetables and fruits are convective without recirculation of the drying agent. Such dryers have a high energy consumption and cannot be attributed to energy-saving installations. (Research purpose) The research purpose is in developing a functional and technological scheme of an energy-efficient thermoelectric dryer that provides a reduction in energy costs during the drying process while maintaining high quality indicators of the finished product and increasing the drying efficiency. (Materials and methods) The methods of system analysis and synthesis of existing knowledge in the field of research on the development of energy-saving dryers, based on the provisions of the theory of drying, heat and mass transfer and thermoelectricity were used. (Results and discussion) The article presents the structural and functional-technological schemes of a convective condensation dryer with recirculation of the drying agent based on Peltier thermoelectric elements. The technological process and the principle of operation of a convective dryer of the condensation type with the use of a thermoelectric assembly operating in the heat pump mode were described. The article proposes a general method for calculating the heat and energy parameters of the dryer based on the heat balance equation. The thermal energy withdrawn by the hot circuit of the thermoelectric assembly, and directed to heating the cooled and drained air, exceeds the energy consumed from the electrical network. The uniform transverse blowing of the drying box with an air ensures uniform drying of the product. (Conclusions) When the drying box is cross-blown and the air flow is relatively fast, the moisture evaporation process is accelerated, the drying time is reduced and the drying quality is improved. It was revealed using preliminary technical and economic calculations that the proposed design provides a reduction in energy consumption compared to traditional dryers by up to 25 percent.
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45

Bai, Wenfeng, and Caofeng He. "System optimization of thermal management performance of fuel cell system for automobile." Thermal Science 25, no. 4 Part B (2021): 2923–31. http://dx.doi.org/10.2298/tsci2104923b.

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Vehicle fuel cell systems release a large amount of heat while generating electricity. The suitable thermal management system must be built to ensure system performance and reliability. Based on the analysis of the working principle of the vehicle fuel cell thermal management system, the paper establishes a control-oriented fuel cell thermal management. The stack, air cooler, hydrogen heat exchanger, bypass valve, heat sink, and cooling water circulating pump model are taking into account. System model, and the relationship between stack current, coolant flow rate, fin surface wind speed, bypass valve opening, and fuel cell temperature are in established in simulation experiments. The paper discusses their effects on system as a whole, air coolers, hydrogen heat exchangers, and the influence of the temperature difference between the inlet and outlet of the radiator. The simulation results can provide guidance and help to design the fuel cell thermal management control system.
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46

Benyoub, M., B. Aour, B. Bouhacina, and K. Sadek. "Numerical Investigation of the Physical Properties Effect on the Thermal Performance of a Vertical Geothermal Heat Exchanger." Engineering, Technology & Applied Science Research 8, no. 2 (April 19, 2018): 2715–23. http://dx.doi.org/10.48084/etasr.1827.

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Low-temperature geothermal energy is a promising technique for heating and cooling residential and commercial premises, especially since it is one of the green energy solutions that respect the environment. The principle of this technique is based on thermal exchange between the heat pump and the basement using a vertically buried heat exchanger. This is usually made of a U-shaped tube inserted vertically in a borehole made in the ground and filled with a filler material. The purpose of the present study is to vary the different construction materials of the U-tube, the filling material and the soil, in order to obtain the most energy-efficient parameters. The evolution of temperature and heat flux as a function of time has been highlighted for different combinations. Knowing that an experimental study requires a considerable monetary fund, the present model has been validated using previously literature results. Recommendations on the choice of different materials of the geothermal heat exchanger are proclaimed at the end of this work.
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47

Wu, Xiao Ting, Ling Xia Kong, Chun Mei Guo, and Bin Hu. "Analysis of Combined Ground-Source Heat Pump and Water Energy Storage System and its Economic Impact Factors." Advanced Materials Research 953-954 (June 2014): 771–74. http://dx.doi.org/10.4028/www.scientific.net/amr.953-954.771.

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This paper makes an introduction of the working principle and the technical and economic benefits of the combined ground-source heat pump and water energy storage system. And then according to the characteristic of this system itself and its mode of operation, we can point out that the energy storage rate, the local policy of electricity price and the strategy of operation are the main factors which influent the economic characteristics of the system. Using the initial investment and the operation cost of the system as the economy evaluation index, we respectively analyze the influence of the above factors on the index. And wish the results of the analysis can provide reference on the design of this new type air-conditioning system.
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48

Yasmin, Humaira, and Naveed Iqbal. "Convective Mass/Heat Analysis of an Electroosmotic Peristaltic Flow of Ionic Liquid in a Symmetric Porous Microchannel with Soret and Dufour." Mathematical Problems in Engineering 2021 (June 26, 2021): 1–14. http://dx.doi.org/10.1155/2021/2638647.

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This research deals with the mathematical model for the development of the peristaltic principle of the combination of the pressure and electroosmotic flow (EOF) of ionic liquid across microchannels with electrokinetic effects. For thermomechanical dynamics, the convective conditions on the boundary for mass and heat transfer at the walls of the channel are quantified. For the microchannel, a porous structure is presumed. Soret, Dufour, and Joule heating are also listed in the scope of the problem addressed. The corresponding equations for the ionic fluid flow, mass, and heat transfer along with the Poisson–Boltzmann equation within the electrical double layer (EDL) are studied. The exact solution has been obtained based on lubrication theory (i.e., low Reynolds number and long wavelength approximations). The channel height is therefore believed to be much higher than the electrical double layer (EDL) thickness. Various dimensionless pertinent parameters illustrate the important aspects of electroosmotically controlled flow and subsequent convective mass/heat transfer attributes in a microchannel. A linear dependency on the fluid flow rate is exhibited by the pressure drop. The analysis shows that the electroosmotic parameter gives a reducing effect on the channel permeability. The distribution of temperature and concentration is greatly affected by convective heat and mass parameters, respectively. In biomedical engineering, the application areas of the study proposed are for the design of the devices such as a microfluidic pump to pump a small amount of ionic liquids by regulating the variation in temperature and concentration.
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49

Zakharov, Mikhail K., Yuri A. Pisarenko, and Oksana I. Sycheva. "COMPARISON OF ENERGY SAVING METHODS FOR DISTILLATION OF LIQUID MIXTURES." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 64, no. 1 (December 9, 2020): 85–92. http://dx.doi.org/10.6060/ivkkt.20216401.6141.

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The analysis and review of the scientific literature on methods and approaches to energy saving in distillation, as one of the most energy-intensive processes for the separation of binary and multicomponent mixtures was carried out. Directions of the scientific literature are highlighted, showing the relevance of the thermodynamic method assessment of separation processes. A comparative analysis of various methods of energy conservation in the separation of liquid binary mixtures by the distillation method is performed (a binary mixture of benzene-toluene was chosen as an example). A conventional distillation column as well as a column with a heat pump and a column with heat integration were considered. As a result of the calculation experiment for each option performed using the Aspen Plus software package the optimal column parameters were determined - the total number of stages and the position of feed stage. The heat consumption in the column boiler was taken as the objective function. It is also shown that with the same characteristics of the columns, the best way to organize the process for separating the selected mixture is to compress the steam stream from rectifying profile of the column with its subsequent use in the boiler of the stripping profile according to the principle of a heat pump. It was established by a calculation experiment that heat integration by compressing steam from rectifying profile of the column and supplying it to the stripping profile gives significantly less energy saving. The calculation of internal energy saving by distillation column was carried out and it was shown that the distributed heat removal from the plates of the rectifying profile of the column and the supply of this heat to the stripping profile plates reduces internal energy saving and leads to an additional increase in heat consumption in the boiler.
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50

Zakharov, Mikhail K., Yuri A. Pisarenko, and Oksana I. Sycheva. "COMPARISON OF ENERGY SAVING METHODS FOR DISTILLATION OF LIQUID MIXTURES." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 64, no. 1 (December 9, 2020): 85–92. http://dx.doi.org/10.6060/ivkkt.20216401.6141.

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Abstract:
The analysis and review of the scientific literature on methods and approaches to energy saving in distillation, as one of the most energy-intensive processes for the separation of binary and multicomponent mixtures was carried out. Directions of the scientific literature are highlighted, showing the relevance of the thermodynamic method assessment of separation processes. A comparative analysis of various methods of energy conservation in the separation of liquid binary mixtures by the distillation method is performed (a binary mixture of benzene-toluene was chosen as an example). A conventional distillation column as well as a column with a heat pump and a column with heat integration were considered. As a result of the calculation experiment for each option performed using the Aspen Plus software package the optimal column parameters were determined - the total number of stages and the position of feed stage. The heat consumption in the column boiler was taken as the objective function. It is also shown that with the same characteristics of the columns, the best way to organize the process for separating the selected mixture is to compress the steam stream from rectifying profile of the column with its subsequent use in the boiler of the stripping profile according to the principle of a heat pump. It was established by a calculation experiment that heat integration by compressing steam from rectifying profile of the column and supplying it to the stripping profile gives significantly less energy saving. The calculation of internal energy saving by distillation column was carried out and it was shown that the distributed heat removal from the plates of the rectifying profile of the column and the supply of this heat to the stripping profile plates reduces internal energy saving and leads to an additional increase in heat consumption in the boiler.
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