| 摘要: |
| 空气源热泵热水器需全年运行而导致其工况复杂多变，因而对系统控制有更高的要求。基于电子膨胀阀可灵活选择控制参数的特性，本文针对排气温度提出一种简易的定排气过热度控制方式，结合定阀开度及传统的定吸气过热度控制方式分别进行实验研究并分析对比其内在过程。实验结果表明：在入风温度为22 ℃时，定阀开度下排气温度大幅下降，但COP最低且液击风险较大。定吸气过热度下COP虽然最高，但排气温度也相应最高。定排气过热度控制下COP虽略低于定吸气过热度控制，但排气温度较定吸气过热度控制下平均有效下降约7 K。同时，与定阀开度控制相比，平均COP提升了4.9%，并可避免大量回气带液风险，从而有效结合了两种方式下的优点。 |
| 关键词: 空气源热泵 电子膨胀阀 定排气过热度 COP |
| DOI： |
| 投稿时间：2018-10-10 修订日期：2018-11-11
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| 基金项目:上海市动力工程多相流动与传热重点实验室(13DZ2260900)项目资助。 |
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| Performance of an Air Source Heat Pump Water Heater using Different Electronic Expansion Valve Control Methods |
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Ji Tianwei, Tao Leren, Yu Zhongyang, Yuan Zhaoyang, Zhang Suhan
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| (Institute of Refrigeration and Cryogenics, University of Shanghai for Science and Technology) |
| Abstract: |
| Because of the requirement of annual operation, an air source heat pump water heater has complex and variable working conditions. Therefore, there are higher requirements for air source heat pump water heater system control. Based on the flexible adjustment characteristics of the electronic expansion valve, this study proposes a simple control method of the fixed discharge superheated temperature. Meanwhile, the control methods of a fixed valve opening and fixed superheated temperature were used to conduct experimental research and analyze their internal process. When the ambient temperature is 22 ℃，the experimental results show that the discharge temperature dramatically decreased under the control methods of a fixed valve opening; however, its coefficient of performance (COP) is the lowest and its compression risk with liquid is high. Although the COP is the highest under the control method of a fixed superheated temperature, the discharge temperature is also the highest. Under the control method of a fixed discharge superheated temperature, its COP is slightly lower than that of the fixed superheated temperature control method. However, the discharge temperature is effectively reduced by nearly 7 K on average. Meanwhile, compared to the fixed valve opening, its average COP increased 4.9% and the risk of compressor suction with a large amount of liquid refrigerant can be avoided. Therefore, this method effectively combines the advantage of the other two methods. |
| Key words: air-source heat pump electronic expansion valve fixed discharge superheated temperature control COP |
