direct expansion meaning in Chinese
直接发泡
直接膨胀
直接蒸发制冷
Examples
- Two types of direct expansion coil are used .
使用了两种类型的直接蒸发盘管。 - There will be a great future if we integrate solar energy utilization techniques into heat pump techniques . on the base of integrating the two techniques , the paper analyzed the art trait of heat pump water heater , the manner of integration , the essential theory ; and developed a small capacity direct expansion solar - assisted heat pump water heater , and tested its thermal performance on the condition of different weather such as sunshine , overcast sky & night . the results make clear a small capacity direct expansion solar - assisted heat pump water heater can absorb not only solar energy but heat energy in air ; it takes on favorable thermal performance , on the condition of different weather such as sunshine , overcast sky & night , coph is about between 3 . 5 ~ 5 . 0 , eer is about between 2 . 5 ~ 4 . 5 , these are better than traditional air source heat pump water heater and non - direct expansion solar - assisted heat pump water heater , and it takes between 2 and 3 kwh to heat 270 kg water from 20 c to 50 c , it is very great in terms of saving energy and protecting environment ,
本文在结合太阳能利用与热泵技术的基础上，分析研究了太阳能热泵热水系统的技术特点；太阳能集热系统与热泵系统的结合方式；直接蒸发式太阳能热泵热水系统的基本理论；研制出小功率直接蒸发式太阳能热泵热水系统样机，并在晴天、阴天、夜晚等不同的天气情况下对其进行了试验，实验结果表明：本小功率直接蒸发式太阳能热泵热水系统不但可以有效地吸收太阳能，还能有效地吸收空气中的能量，具有良好的热性能，在不同的天气情况下，其制热系数cop _ h大约在3 . 5 5 . 0之间，优于传统的空气热泵和非直接蒸发式太阳能热泵热水系统：其效能比eer大约在2 . 5 4 . 5之间，将270kg水从20加热到50只需用电2 3度，节能及环保效果明显。