| 摘要: |
| 补气增焓式空气源热泵因在低温环境下运行能效高的优势在我国寒冷地区具有较大应用潜力，本文实验研究了在环境温度为-12 ℃时，制冷剂充注量对额定制热量为130 kW的补气增焓式空气源热泵机组能效及运行参数的影响。结果表明：随着制冷剂充注量由18 kg增至25 kg，压缩机吸气温度、压力分别在-14~-11 ℃与0.295~0.320 MPa范围内呈下降趋势但存在波动，排气压力缓慢增加5.6%，制热量及压缩机功率稳定增长，系统能效逐渐增加；充注量c增至25 kg后，压缩机运行状态变差，排气温度增加11%，排气压力增加13.6%；充注量为26 kg时，系统COP达到峰值为2.12，相比充注量为19 kg时增加14.6%，随着充注量由26 kg增至28 kg，COP缓慢下降。 |
| 关键词: 空气源热泵 补气增焓 制冷剂 R410A |
| DOI： |
| 投稿时间：2021-12-18 修订日期：2022-04-07
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| 基金项目: |
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| Effect of Refrigerant Charge on Air-source Heat Pump System with Vapor Injection |
| Shi Han,Zheng Wenke,Jiang Yiqiang,Wang Fei |
| (School of Architecture, Harbin Institute of Technology;Key Laboratory of Cold Region Human Settlement Environment Science and Technology, Ministry of Industry and Technology;Beikong Jin′an New Energy Technology Development (Beijing) Co.,Ltd.) |
| Abstract: |
| Air-source heat pump systems with vapor injection have promising potential applications in cold areas in China owing to their high efficiency at low temperatures. This study investigates the effect of the refrigerant charge on the energy efficiency and operating parameters of air-source heat pump systems with vapor injection at low temperatures. The results demonstrate that as the charging amount increased from 18 kg to 25 kg, the suction temperature and pressure of the compressor slowly decreased from ?11 to 14 °C and from 0.295 to 0.32 MPa, respectively; the discharge pressure slowly increased by 5.6%; the heating capacity and compressor power steadily increased; the energy efficiency gradually increased. When the refrigerant charge exceeded the critical charging amount of 25 kg, the operation of the compressor degraded; the temperature of discharge gas increased by more than 11%; the discharge pressure increased by more than 13.6%. At the optimal refrigerant charging amount of 26 kg, the maximum energy efficiency of the unit was 2.12, which demonstrated a 14.6% increase compared with the case of 19 kg refrigerant charge. As the charging amount increased from 26 to 28 kg, the coefficient of performance slowly decreased. |
| Key words: air-source heat pump enhanced vapor injection refrigerant R410A |
