Computational model for a ground coupled space cooling system with an underground energy storage tank |
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| Affiliation: | 1. Department of Mechanical Engineering, University of Gaziantep, 27310 Gaziantep, Turkey;2. Department of Mechanical Engineering, Suleyman Demirel University, Isparta, Turkey;1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, Hubei, China;2. West-to-East Gas Pipeline Company Gas Storage Project Department, PetroChina Company Limited, Changzhou 213200, Jiangsu, China;3. McDougall School of Petroleum Engineering, University of Tulsa, Tulsa, OK 74104, USA;4. Mackay School of Earth Sciences and Engineering, University of Nevada, Reno, NV 89557, USA;1. MIT Portugal Doctoral Program, Sustainable Energy Systems, University of Coimbra, Rua Luís Reis Santos, Pólo II, 3030-788 Coimbra, Portugal;2. Institute of Earth Sciences (ICT), University of Évora, Colégio Luís António Verney, Rua Romão Ramalho, 59, 7000-671 Évora, Portugal;3. Department of Geosciences, School of Science and Technology, Institute for Research and Advanced Training, Institute of Earth Sciences, University of Évora, Colégio Luís António Verney, Rua Romão Ramalho, 59, 7000-671 Évora, Portugal;4. CeBER and Faculty of Economics, University of Coimbra, Av. Dias da Silva, 165, 3004-512 Coimbra, Portugal;5. INESC Coimbra, Rua Sílvio Lima, Pólo II, 3030-290 Coimbra, Portugal;1. Department of Mechanical Engineering, Kahramanmaras Sutcu Imam University, 46100 Kahramanmaras, Turkey;2. Department of Mechanical Engineering, Firat University, 23119 Elazig, Turkey;3. Department of Mechanical Engineering, University of Gaziantep, 27310 Gaziantep, Turkey;1. School of Civil Engineering, Shandong University, Jinan, Shandong 250061, China;2. Department of Civil Engineering, Technical University of Denmark, Brovej Building 118, Lyngby 2800, Denmark;3. Faculty of Civil and Environmental Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel;1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;2. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | A computational model for determining annual periodic performance of a cooling system utilizing a ground coupled chiller and a spherical underground thermal energy storage tank is developed. An analytical solution for the transient heat transfer problem outside the storage tank is obtained by the application of complex finite Fourier transform (CFFT) technique. Analytical expressions for heat gain to the space and energy consumption of the chiller are acquired, and these expressions are coupled with the transient temperature field problem to obtain computational model. Variation of water temperature in the storage tank is calculated using the transient solution of the problem over an entire year for different soil, chiller, and storage tank characteristics. Temperature profile of earth surrounding the storage tank and the COP of the cooling unit are also investigated under various assumptions and varying system design and operating conditions. The results show that water temperature in the storage tank remains under ambient air temperature during summer months, and thus the proposed ground coupled cooling system should yield higher COP values compared to a corresponding air source system. |
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