| 摘要: |
| 本文通过实验比较了热泵热水器在不同制冷剂充注量下的制热性能和电子膨胀阀的调节特性，定量研究了电子膨胀阀调节方式对制热性能的影响。结果表明：阀开度16%和定过热度10 ℃工况下的最佳充注量均为1.1 kg，相应的最佳整体制热性能COPa分别为3.05和3.68；过大的充注量降低了制热性能和电子膨胀阀的调节范围；与阀开度调节相比，过热度调节可避免吸气带液的发生；在最佳充注量下，对比阀开度和过热度两种电子膨胀阀调节方式得出，后者制热性能更优。 |
| 关键词: 空气源热泵 变制冷剂质量流量 制热性能 电子膨胀阀 过热度 |
| DOI： |
| Received:June 27, 2017 |
| 基金项目:上海市动力工程多相流动与传热重点实验室(1N-15-301-101)资助。 |
|
| Effect of Refrigerant Charge on the Performance of Air-source Heat Pump Water Heater |
|
Yuan Zhaoyang, Tao Leren, Yu Zhongyang, Gu Zhipan
|
| (School of Energy and Power Engineering, University of Shanghai for Science and Technology) |
| Abstract: |
| In this paper, the effects of a refrigerant charge on the system performance of a heat pump water heater and the regulating characteristics of the electronic expansion valve were studied experimentally. The system performance under different regulation modes of electronic expansion valve was also quantitatively analyzed. The experimental results show that 1.1 kg is the best refrigerant charge when the valve opening is 16% and the superheat temperature is 10 ℃. The corresponding maximum coefficient of performance (COPa) was 3.05 and 3.68, respectively. Excessive refrigerant charge reduces the system performance and the adjustment range of electronic expansion valve. To avoid the liquid suction of compressor, the adjustment of superheated temperature is better than that of valve opening. The system performances of the two regulating modes are compared under the optimum refrigerant charge, and the results show that the superheat regulation method is the best. |
| Key words: air-source heat pump variable refrigerant mass flow rate coefficient of performance electronic expansion valve degree of superheat |
