A comparative investigation of solar-assisted heat pumps with solar thermal collectors for a hot water supply system
A comparative investigation of solar-assisted heat pumps with solar thermal collectors for a hot water supply system
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DOI：
10.1016/j.enconman.2018.07.035
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发表时间：
2018-09
影响因子：
10.4
通讯作者：
Taehoon Kim;Byung-il Choi;Yongshik Han;K. Do
中科院分区：
文献类型：
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作者：
Taehoon Kim;Byung-il Choi;Yongshik Han;K. Do
新提出了混合太阳能集热器的概念，该集热器具有太阳能热接收部分和空气源接收部分，在没有太阳辐射的情况下可以作为带风扇的翅片管换热器工作。这是混合太阳能集热器的显著特点。介绍了采用混合集热器的太阳能辅助热泵系统。为了分析所提出的太阳能辅助热泵系统，建立了一个考虑风机和循环泵功耗的简单热力学模型。用相应的实验数据验证了空气源热增益模型的计算结果，最大误差为8.8%。参数化研究表明，集热器面积和吸收系数的增大导致了混合集热器太阳能辅助热泵系统性能的提高。此外，还对三种不同的间接太阳能辅助热泵进行了比较研究。从年运行时数来看，串联型太阳能热泵一年运行时数最差，为3509 h。另一方面，混合太阳能集热器的太阳能辅助热泵具有7036 h的优越性能。如果混合太阳能集热器的效率与传统平板太阳能集热器相当，则建议的太阳能辅助热泵系统冬季COP较并联太阳能辅助热泵系统可提高5.1%。因此，由于太阳能辅助热泵系统具有显著延长年运行时间，系统配置简单，投资成本较低的经济方面的优点，清楚地表明了所建议的太阳能辅助热泵系统作为独立热水供应系统的可行性。
The concept of a hybrid solar collector was newly proposed, which has a solar thermal receiver part and air-source receiver part that can operate as a fin-tube exchanger with fans when there is no solar radiation. This is the distinguishing feature of the hybrid solar collector. The solar-assisted heat pump system applying the hybrid solar collectors was also introduced. To analyze the proposed solar-assisted heat pump system, a simple thermodynamic model considering the electric power consumption for fans and circulation pumps was developed. The model results for the air-source heat gain were validated from the corresponding experimental data with the maximum error of 8.8%. Based on the parametric study, the increase of the collector area and the absorption coefficient led to the enhancement of the system performance of the solar-assisted heat pump with hybrid solar collectors. In addition, a comparative investigation was carried out for three different indirect solar-assisted heat pumps. Regarding of annual operation hour, the serial-type solar-assisted heat pump was worst at 3509 h over a year. On the other hand, the solar-assisted heat pump with hybrid solar collectors had the superior performance of 7036 h. If the efficiency of the hybrid solar collector was as superior as the conventional flat plate solar collector, the system COP of the suggested solar-assisted heat pump system in the winter season could be improved by 5.1% compared with that of the parallel-type solar-assisted heat pump system. Consequently, it clearly showed the feasibility of the suggested solar-assisted heat pump system as a standalone system for hot water supply due to the merits of significantly extending the annual operation hour, the simple system configuration, and the economic aspect with lower capital cost.