使用电子膨胀阀的热泵热水器动态性能数值模拟与实验研究  

Numerical Simulation and Experimental Study on the Dynamic Performance of Heat Pump Water Heater with Electronic Expansion Valve

作　　者：李卫国[1] 郭宪民[1] 孙涛[1] 

机构地区：[1]天津商业大学天津市制冷重点实验室,天津300134

出　　处：《制冷学报》2011年第4期25-29,共5页Journal of Refrigeration

基　　金：天津市应用基础研究计划(06YFJMJC05500)资助~~

摘　　要：在不同的环境工况下对使用电子膨胀阀的热泵热水器系统动态性能进行了实验研究,测量了电子膨胀阀不同开度条件下热泵热水器的动态制热量、性能系数等参数,分析了电子膨胀阀开度对热泵热水器性能的影响。同时,对热泵热水器系统动态性能进行了数值模拟,并将模拟结果与实验结果进行了比较。结果表明:在电子膨胀阀某一开度下,系统性能系数存在一个最大值;对于电子膨胀阀不同开度,在加热初始阶段,电子膨胀阀开度较大时系统COP和制热量较高,而在加热后期则恰恰相反。通过在不同加热时段使用电子膨胀阀不同开度实验发现,系统性能得到显著提高,最大可提高7.6%。热泵系统性能数值模拟与实验结果的变化趋势一致,说明数学模型和计算方法是可行的。A series of experiments on the dynamic performance of the heat pump water heater（HPWH） unit with electronic expansion valve（EEV） under different environmental conditions were conducted.The dynamic heating capacity and coefficient of performance（COP） of the HPWH unit under different EEV openings were measured.The effects of the EEV opening on the performance of the HPWH unit were analyzed.Meanwhile,the dynamic performance of the HPWH with EEV was simulated and the results were compared with the experimental one.The experimental results indicate that during the heating process a maximum COP exists for a fixed EEV opening.For different EEV openings,the COP and heating capacity of the system using larger EEV opening are superior to those using the smaller one in the initial heating stage.While in the late stage,the system performance using smaller EEV opening is better.It is found that the system performance is improved significantly by changing the EEV opening in the different heating period and the average COP of the HPWH system is increased by 7.6%.The simulation result is in good agreement with the experimental one,which indicate that the mathematical models and calculation method are feasible.

关 键 词：热工学 热泵热水器 电子膨胀阀 动态性能 实验研究 

分 类 号：TB657[一般工业技术—制冷工程] TQ051.5[化学工程]