Thermal entransy analysis on the thermal performance of flat plate solar air collectors
Thermal entransy analysis on the thermal performance of flat plate solar air collectors
复制标题
平板太阳能空气集热器热性能的热火分析
DOI：
10.1007/s12273-016-0326-z
复制
发表时间：
2017
影响因子：
5.5
通讯作者：
Yang Ming
中科院分区：
文献类型：
--
作者：
Deng Jie;Yang Xudong;Xu Yupeng;Yang Ming
基于热电类比法（即热能量分析），确定了不同类型平板太阳能空气集热器的统一空气侧对流换热系数。此外，还定义了集热器热力特性匹配系数，以描述集热器空侧传热与总热损失之间集热器热力性能的匹配特性。研究发现，采用集热器热性能测试方法可以实验确定空气侧对流换热系数，从而比较不同气流结构类型的fpsac的空气侧热性能。集热器热力特性匹配系数越小，FPSAC的热力完美度越好。集热器热力匹配系数的最小极限值接近于零，但在实际工程中不会消失。对一种通用FPSAC的总能量耗散和能量增量进行了参数敏感性分析。结果表明，提高FPSAC的效率截距是降低总能量耗散和增加有用能量增量的有效途径。这相当于热分析的认知结果。然而，单热分析无法提取由热耗分析确定的评价指标。
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.