Performance of a coupled cooling system with earth-to-air heat exchanger and solar chimney |
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| Affiliation: | 1. Durham School of Architectural Engineering and Construction College of Engineering, University of Nebraska-Lincoln, Omaha, NE, USA;2. Department of Computer & Electronics Engineering, University of Nebraska-Lincoln, Omaha, NE, USA;1. Mechanical Engineering Department, University of Tehran, Tehran, Iran;2. Mechanical Engineering Department, University of Utah, Salt Lake City, UT, United States;3. Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States;1. Escola de Engenharia, FURG, Rio Grande, Brazil;2. Núcleo Orientado para a Inovação da Edificação (NORIE), UFRGS, Porto Alegre, Brazil;3. Programa de Pós-Graduação em Modelagem Computacional (PPGMC), FURG, Rio Grande, Brazil;4. Programa de Pós-Graduação em Engenharia Mecânica (PROMEC), UFRGS, Porto Alegre, Brazil;1. College of Mechanical and Energy Engineering, Jimei University, Xiamen, China;2. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an, China;3. Key Laboratory of Renewable Energy and Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, China;4. Graduate University of Chinese Academy of Sciences, Beijing, China;1. Mechanical Engineering Dept., University of Technology, Baghdad, Iraq;2. Electromechanical Eng. Dept., University of Technology, Baghdad, Iraq;1. Durham School of Architectural Engineering and Construction College of Engineering, University of Nebraska-Lincoln, Omaha, NE, USA;2. Architectural Engineering Department, Lawrence Technological University, Southfield, MI, USA;1. Key Laboratory of the Three Gorges Reservoir Region''s Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China;2. National Centre for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing 400045, China |
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| Abstract: | Buildings represent nearly 40 percent of total energy use in the U.S. and about 50 percent of this energy is used for heating, ventilating, and cooling the space. Conventional heating and cooling systems are having a great impact on security of energy supply and greenhouse gas emissions. Unlike conventional approach, this paper investigates an innovative passive air conditioning system coupling earth-to-air heat exchangers (EAHEs) with solar collector enhanced solar chimneys. By simultaneously utilizing geothermal and solar energy, the system can achieve great energy savings within the building sector and reduce the peak electrical demand in the summer. Experiments were conducted in a test facility in summer to evaluate the performance of such a system. During the test period, the solar chimney drove up to 0.28 m3/s (1000 m3/h) outdoor air into the space. The EAHE provided a maximum 3308 W total cooling capacity during the day time. As a 100 percent outdoor air system, the coupled system maximum cooling capacity was 2582 W that almost covered the building design cooling load. The cooling capacities reached their peak during the day time when the solar radiation intensity was strong. The results show that the coupled system can maintain the indoor thermal environmental comfort conditions at a favorable range that complies with ASHRAE standard for thermal comfort. The findings in this research provide the foundation for design and application of the coupled system. |
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| Keywords: | Earth-to-Air heat exchanger Solar chimney Coupled system Cooling capacity |
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