Study on the thermodynamic characteristic matching property and limit design principle of general flat plate solar air collectors (FPSACs)

详细信息    查看全文

• 作者：Jie Deng ; Xudong Yang ; Rongjiang Ma ; Yupeng Xu
• 刊名：Building Simulation
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：9
• 期：5
• 页码：529-540
• 全文大小：1,855 KB
• 刊物类别：Engineering
• 刊物主题：Building Construction, HVAC and Refrigeration
  Engineering Thermodynamics and Transport Phenomena
  Atmospheric Protection, Air Quality Control and Air Pollution
  Environmental Computing and Modeling
  Chinese Library of Science
  
• 出版者：Tsinghua University Press, co-published with Springer-Verlag GmbH
• ISSN：1996-8744
• 卷排序：9

文摘

Based on a typical single pass flat plate solar air collector (FPSAC) model, the collector thermodynamic characteristic matching property between the air-side heat transfer and total heat losses is analyzed in terms of unified air-side heat transfer coefficient U_b-f and total heat loss coefficient U_L. Then the limit design principle of FPSACs is discussed in order to obtain high collector efficiency intercepts. The results show that, both lower and upper limit values of U_L exist for obtaining an expected efficiency intercept (η₀) which is lower than the maximum realizable intercept ((η₀)_max) with specific collector components. The case of maximum realizable intercept (η₀)_max can be obtained by the minimum realizable total heat loss coefficient (U_L)_min and a high convective heat transfer coefficient U_b-f (U_b-f = 200 W/(m2·K) is argued to be good collector air-side thermal performance and is considered in the present study), resulting in a minimum thermodynamic characteristic coefficient ζ_min. And the maximum realizable intercepts for different component combination cases of FPSACs are obtained by numerical calculation. Besides, for FPSACs with specific airflow channels, the cases of minimum realizable (U_L)_min represent the limit design.Keywordsflat plate solar air collector (FPSAC)thermodynamic characteristic matching propertylimit design principlecollector efficiency intercept