Abstract

A solar heat pump system was designed and built. In this paper, the operation performance of the system was investigated experimentally. The effects of significant parameters such as the water temperature at the inlet and outlet of the evaporator, collector, and condenser and the solar radiation intensity were considered. When the water temperature at the condenser inlet was set at different values, the water temperature at the evaporator inlet was found to be proportional to the suction pressure and discharge pressure of the compressor and inversely proportional to the compression ratio. At different water temperatures at the evaporator inlet, the influence of the water temperature at the condenser outlet on the suction pressure was not obvious; however, the maximum change in the suction pressure was 0.9MPa. The power consumption of the compressor was hardly affected. Lower water temperature at the collector inlet contributes to improvement of its heat collection efficiency, and various factors should be considered in the design of the collector. The higher was the water temperature at the evaporator inlet and the lower was the water temperature at the condenser outlet, the larger was the found coefficient of performance ( COP) of the heat pump unit COP \(_{hp}\) , as well as the found COP of system COP \(_{sys}\). In addition, as the solar radiation intensity grew, the heating capacity and COP \(_{sys}\) increased continuously, the maximum variation in COP \(_{sys}\) being 0.4. It is hoped that this research will offer valuable insights for designing advanced solar heat pump (SHP) systems.

中文翻译：

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太阳能热泵系统性能的实验研究

摘要

设计并建造了太阳能热泵系统。本文对系统的运行性能进行了实验研究。考虑了蒸发器、集热器、冷凝器进出口水温、太阳辐射强度等重要参数的影响。当冷凝器入口的水温设定为不同的值时，发现蒸发器入口的水温与压缩机的吸入压力和排出压力成正比，与压缩比成反比。在蒸发器入口不同水温下，冷凝器出口水温对吸气压力的影响不明显；然而，吸入压力的最大变化为0.9MPa。压缩机的功耗几乎没有受到影响。较低的集热器入口水温有助于提高其集热效率，在设计集热器时应考虑各种因素。蒸发器入口水温越高，冷凝器出口水温越低，发现的性能系数越大（热泵机组COP \(_{hp}\)的COP )  ，以及系统COP \(_{sys}\)的找到的COP。此外，随着太阳辐射强度的增加，制热能力和COP \(_{sys}\)不断增加， COP \ (_{sys}\) 的最大变化 为 0.4。希望这项研究能为设计先进的太阳能热泵（SHP）系统提供有价值的见解。