Numerical analysis of temperature non-uniformity and cooling capacity for capillary ceiling radiant cooling panel |
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| Affiliation: | 1. School of Urban Construction, University of South China, Hengyang, 421001, China;2. School of Energy Science and Engineering, Central South University, Changsha, 410083, China;3. Hunan University of Commerce, Changsha, 410205, China;1. School of Municipal & Environmental Engineering, Harbin Institute of Technology, P.O.Box 2651, Harbin 150090, China;2. Smart Energy and System Integration, Technical Research Centre of Finland, P.O.Box 1000, FI-02150 Espoo, Finland;1. Ministry of Education Key Laboratory of Renewable Energy Utilization Technologies in Buildings, Shandong Jianzhu University, Jinan 250101, China;2. Shandong Zhongrui New Energy Technology Co. Ltd., Jinan 266071, China;1. School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, PR China;2. School of Civil Engineering, Dalian University of Technology, Dalian 116024, PR China;1. School of Architecture and Urban Planning, Shenzhen University, Shenzhen 518060, China;2. Department of Building Science, Tsinghua University, Beijing 100084, China |
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| Abstract: | Capillary ceiling radiant cooling panel is a high temperature cooling system, which could pose low energy consumption to meet thermal comfort requirements. A computational fluid dynamics (CFD) simulation study on heat transfer of chilled water flow in the capillary of ceiling radiant cooling panel was performed to attain surface temperature distributions and cooling capacities. Six influencing factors included chilled water inlet parameters, conditions of gypsum plaster and capillary mats structural parameters were considered to obtain the complicated relationships between capillary radiant panel conditions and heat transfer performance. The index of temperature non-uniformity coefficient was proposed to evaluate temperature profiles of ceiling panel surface. The results of the simulation were compared with the values depicted in ASHRAE Handbook and good agreement had been achieved. The average difference between simulation results and the values reported by ASHRAE handbook was within the region of 15%. The research results showed that temperature non-uniformity coefficient was negatively correlated with temperature of chilled inlet water (linear correlation), water velocity (correlation coefficient R = ?0.85), and pipe diameter (correlation coefficient R = ?0.93), but positively and linearly correlated with tube spacing. Cooling capacity was found to have negative linear correlation with temperature of chilled inlet water, covering thickness and tube spacing. |
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| Keywords: | Capillary ceiling radiant cooling panel Distribution of temperature non-uniformity Cooling capacity CFD Numerical analysis |
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