为分析直膨式太阳能热泵耦合地板辐射供暖系统在北方寒冷地区的实际运行特性,设计并搭建以丙烷（R290）为工质的直膨式太阳能热泵供暖实验平台,分析冬季不同运行工况下环境参数对系统热力性能的影响。实验结果表明：系统可实现室内供暖的稳定性,实验测试期间平均室温保持在16.1~20.8 ℃之间,热泵系统性能系数（COP）保持在2.57~4.30之间,供暖系统COP保持在2.24~3.98之间。太阳辐照度每增加50 W/m2,热泵系统COP提升4.9%;环境温度每升高1 ℃,热泵系统COP提升2.4%。太阳辐照度对热泵系统的电子膨胀阀开度和工质质量流量影响较为显著。当终止水温从45 ℃提升至55 ℃时,热泵系统COP降低12.2%;而在终止水温为50 ℃时,供暖系统COP达到最大值3.37。
Abstract
In order to analyze the actual operation characteristics of direct-expansion solar-assisted heat pump for radiant floor heating system in Northern Cold Region, a direct-expansion solar-assisted heat pump system using propane （R290） as refrigerant is designed and built, in which the effect of environmental parameters on the thermal performance of the system under different operating conditions in winter is analyzed. The experimental results show that the system can realize the stability of indoor heating. During the experiments, the average room temperature is kept between 16.1 and 20.8 ℃, the coefficient of performance （COP） of the heat pump is kept between 2.57 and 4.3, and the COP of the heating system is kept between 2.24 and 3.98. Furthermore, when the solar irradiation intensity increases by 50 W/m2, the COP of the heat pump increases by 7.1%. When the ambient temperature increases by 1 ℃, the COP of the heat pump increases by 6.7%. In addition, the solar radiation intensity has significant influence on the opening of electronic expansion valve and refrigerant mass flow rate of the heat pump system. When the final water temperature in the hot water storage tank increases from 45 to 55 ℃, the COP of the heat pump decreases by 12.2%, while the COP of the heating system reaches the maximum of 3.37 at the final water temperature of 50 ℃.
关键词
太阳能 /
热泵系统 /
丙烷 /
性能系数 /
地板辐射供暖 /
实验
Key words
solar energy /
heat pump system /
propane /
coefficient of performance /
radiant floor heating /
experiment
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基金
国家自然科学基金面上项目（51776115）; 山东省研究生导师指导能力提升项目（SDYY17037）; 山东科技大学研究生导师指导能力提升计划（KDYC17009）
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