Entransy analysis on the thermal performance of flat plate solar air collectors
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- 作者：Jie Deng ; Xudong Yang ; Yupeng Xu ; Ming Yang
- 关键词：flat plate solar air collector (FPSAC) ; thermal entransy dissipation ; thermodynamic characteristic matching coefficient ; airside thermal performance
- 刊名：Building Simulation
- 出版年：2017
- 出版时间：April 2017
- 年：2017
- 卷：10
- 期：2
- 页码：193-202
- 全文大小：
- 刊物类别：Engineering
- 刊物主题：Building Construction and Design; Engineering Thermodynamics, Heat and Mass Transfer; Atmospheric Protection/Air Quality Control/Air Pollution; Monitoring/Environmental Analysis;
- 出版者：Tsinghua University Press
- ISSN：1996-8744
- 卷排序：10
文摘
Based on the thermo-electric analogy (the so-called thermal entransy analysis), the unified airside convective heat transfer coefficient for different sorts of flat plate solar air collectors (FPSACs) is identified in terms of collector aperture area. In addition, the collector thermodynamic characteristic matching coefficient is defined to depict the matching property of collector thermal performance between the collector airside heat transfer and the total heat losses. It is found that the airside convective heat transfer coefficient can be experimentally determined by collector thermal performance test method to compare the airside thermal performances of FPSACs with different types of airflow structures. Moreover, the smaller the collector thermodynamic characteristic matching coefficient is, the better the thermodynamic perfect degree of a FPSAC is. The minimum limit value of the collector thermodynamic matching coefficient is close to zero but it can not vanish in practical engineering. Parameter sensitivity analysis on the total entransy dissipation and the entransy increment of a general FPSAC is also undertaken. The results indicate that the effective way of decreasing total entransy dissipation and enhancing the useful entransy increment is improving the efficiency intercept of the FPSAC. This is equivalent to the cognition result of thermal analysis. However, the evaluation indices identified by the thermal entransy analysis can not be extracted by singular thermal analysis.