| 摘要: |
| 节流装置的调节对空气源热泵热水系统的性能有着重要影响，电子膨胀阀因其调节范围广而逐渐得到应用，因此需要对其深入研究。以空气源热泵热水器实验系统为研究对象，通过改变电子膨胀阀开度，研究不同调节方式对系统性能的影响。结果表明：1)相同膨胀阀开度下，系统制热量和系统COP随加热的进行均呈先上升后下降的趋势；不同膨胀阀开度下，在加热前期（20~30 ℃），膨胀阀开度越大，系统COP越大；在加热后期（45~55 ℃）结果相反；2)在加热过程中，各膨胀阀开度下系统COP趋势线相互交叉，由于压缩机少量吸气带液可以改善系统性能，因此交叉点与各阀开度下过热度达到0 K的点相近但并不重合；3)以水箱平均温度为控制对象调节电子膨胀阀的方法（优化1#）对系统COP的最大优化率为24.8%；以压缩机吸气过热度为控制对象调节电子膨胀阀的方法（优化2#）与优化1#系统COP相比，最大相差4.2%，且经过实验验证具有适用性。 |
| 关键词: 空气源 热泵 电子膨胀阀 控制 |
| DOI： |
| 投稿时间：2017-01-15
|
| 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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| Effects of Control for Electronic Expansion Valve on Performance of Air-source Heat-pump Water Heater |
|
Yu Zhongyang, Tao Leren, Yuan Chaoyang, Wang Chao
|
| (Institute of Refrigeration and Cryogenics Engineering, University of Shanghai for Science and Technology) |
| Abstract: |
| Control of the electronic expansion valve in an air-source heat-pump water heater has considerable influence on the system performance and should be the focus of investigation. In this study, the effect of the opening of the electronic expansion valve on the performance of an air-source heat-pump water heater was analyzed. The results show that, when the system operates with the same valve opening, the heating capacity and coefficient of performance (COP) exhibit a declining trend after an initial ascent. For different valve openings, the system COP is in direct proportion to the opening when the average cistern temperature is 20-30 ℃, whereas it is in inverse proportion to the opening for an average cistern temperature of 45-55 ℃. The system COP trend lines for each valve opening indicate a cross each other. As compressor suction with little liquid refrigerant can improve the system performance, the intersection occurs close to the point at which the superheated temperature reaches 0 K, but does not coincide with it. Although the maximum optimization ratio on system COP for the method of controlling the electronic expansion valve via the average cistern temperature (optimization #1) can reach 24.8%, its feasibility is poor. The maximum optimization ratio on system COP for the method of controlling the electronic expansion valve via the superheated temperature in the compressor suction (optimization #2) is lower than that for optimization #1, at 4.2%. However, the results of the confirmatory experiment verify the feasibility of optimization #2. |
| Key words: air-source heat pump electronic expansion valve control |
