| 摘要: |
| 冬季我国北方室外环境蕴含大量天然冷源，热力学分析表明热泵工质过冷释放的热量可以在蒸发器的等温吸热过程中获得补偿。为了研究大气自然冷源对热泵制热性能的影响，增设室外过冷器，搭建利用自然冷源过冷的空气源热泵实验装置。实验结果表明：当室外环境温度大于0 ℃，冷凝温度小于45 ℃的条件下，自然冷源过冷对热泵制热量与制热COP影响均较小，系统制热量维持在6.22 ~ 6.70 kW，制热COP维持在3.03，压缩机排气温度维持在103 ℃以下；当室外环境温度小于 -10 ℃，冷凝温度大于50 ℃时，随过冷度的增加，压缩机功率增加、排气温度显著增高，系统制热量呈先缓慢增加后减小趋势，制热COP降至2.3。基于上述研究提出一种空气源热泵过冷融霜新型除霜方式，融霜同时不停止制热。 |
| 关键词: 空气源热泵 过冷 制热性能 融霜 |
| DOI： |
| 投稿时间：2021-04-27 修订日期：2021-07-10
|
| 基金项目:本文受河北省教育厅青年自然科学基金项目（No.QN2020045），2021年河北省级研究生示范课“冷热源工程”建设项目（No.KCJSX2021084）和2020年度校级研究生教育教学研究项目（No.2020YJSJG05）资助。 |
|
| Experimental Study on Heating Performance of Air-source Heat Pump with Natural Cold Source Subcooling |
| Niu Jianhui,Bu Qiujun |
| (Department of Energy Engineering, Hebei University of Architecture) |
| Abstract: |
| There are many natural cold sources in the northern China in winter, and thermodynamic analysis shows that the heat released by the working medium subcooling can be compensated in the isothermal heat absorption process of the evaporator. To determine the influence of a natural cold source on the heating performance of a heat pump, an outdoor sub-cooler was added, and an air source heat pump experimental device using a natural cold source was built. The influence of subcooling on the heating performance of the air source heat pump was experimentally investigated. The experimental results show that subcooling has minimal influence on the heating capacity and heating coefficient of performance (COP) of the heat pump when the outdoor temperature is above 0 °C and the condensing temperature is less than 45 °C. The heating capacity of the system is maintained between 6.22and 6.70kW, the heating COP is maintained at approximately 3.03, and the discharge temperature of the compressor does not exceed 103 °C. However, when the outdoor and condensing temperatures are ?10 °C and 50 °C, respectively, as the subcooling increases, the compressor power and its discharge temperature increase significantly, the heating capacity of the system increases slightly at first and then decreases, and the heating COP decreases to 2.3. The results show the feasibility of the proposed air source heat pump system, which uses subcooling for defrosting and can achieve defrosting without stopping heating. |
| Key words: air-source heat pump subcooling heating performance defrosting |
