节流元件对空调Cd系数影响的试验研究

试验研究热力膨胀阀和节流阀芯对空调Cd系数的影响，测试数据表明，与采用节流阀芯的空调系统相比，采用热力膨胀阀的空调系统Cd系数降低47．5％～63．4％，整机SEER提高0．5左右。建议SE—ER值高于15的定速空调系统采用热力膨胀阀进行节流。     

R134a空气源热泵热水器实验研究与性能分析

对一台工质为R134a的空气源热泵热水器样机进行了实验测试,研究了在环境温度为20/15℃工况下,最佳充灌量(1500 g)的70%,85%,100%和115%下的系统特性,并在最佳充灌量下研究了膨胀阀开度分别为30%,45%,60%时的系统性能。结果表明系统性能随充灌量增加呈先增大后减小趋势。膨胀阀开度对系统逐时COP影响较大,在水箱温度超过32℃时,增大膨胀阀的开度可以提高系统的COP。此外,基于实验研究,论文对系统损失进行了分析。结论表明系统主要的损失分布在压缩机和冷凝器。系统效率随着水箱温度的升高而不断减小,在开度为30%和60%下,系统效率分别下降约8%和10%左右。     

Measured effect of airflow and refrigerant charge on the seasonal performance of an air-source heat pump using R-410A

The objective of this study was to measure the effects of improper airflow and refrigerant charge on the seasonal performance of a typical 10.6 kW, R-410A residential heat pump with a thermostatic expansion valve.Heating and cooling tests were performed in combinations of three refrigerant charges of 75%, 100%, and 125% of nominal value and two airflows of 75% and 100% of rated airflow. In addition, cyclic tests were performed to estimate the heating and cooling seasonal coefficient of performance (COP) at six climate zones specified by Air-Conditioning, Heating, and Refrigeration Institute (AHRI) Standard 210/240-2008. Results showed that, in each climate zone, increases in refrigerant charge at the rated airflow could improve the unit's heating seasonal COP by as much as 5%. However, combined decreases in airflow and refrigerant charge could penalize the unit's heating seasonal COP by as much as 10%.     

热力膨胀阀参数对定排量汽车空调系统影响的研究

在台架试验中发现装备了C供应商的热力膨胀阀的定排量汽车空调系统在一些特定工况下会出现过热度异常现象,而更换成A供应商的热力膨胀阀该现象消失。然后,对C供应商和作者分别提出的热力膨胀阀不同参数更改方案进行相同的台架验证,证实本文所提方案对消除该现象有效。最后,整车级的环境模拟风洞试验显示,本文所提方案使该型汽车空调系统过热度异常现象消失且制冷性能有所改善。