以空气、水为热源,实验研究双热源热泵水冷蒸发器不同水温、水量占比对系统制热性能的影响。通过温控器将水温分为20、30 ℃两档,通过阀门控制水冷蒸发器水量占比在0%、67%、100%三档,共设置4组不同工况对制热性能进行对比研究,分析不同工况下水冷蒸发器进出口温度、制热量变化,研究双热源热泵和单空气源热泵在除霜期的制热量变化规律。研究表明：水源的补热作用可提升系统制热性能,相较于单空气源系统,其他3种工况下双热源系统运行期间平均能效比分别为2.26、2.61、2.54,相较于单空气源系统提升31.4%、51.7%、47.7%,其中工况2、工况3的系统能效比最高值可达3.04、3.44。温度高、水量占比大的水冷蒸发器对系统的补热作用明显,相同水量下,水温高的系统能效比提升效果好。同时水源的补热作用可改善系统的结霜问题,单空气源系统相较于双热源系统除霜时间长、效果差,在强制除霜的作用下会消耗掉部分系统制热量,导致其能效比低于双热源系统。
Abstract
Using air and water as heat sources, the effects of different water temperature and water ratio on the heating performance of a double-heat pump water-cooled evaporator were experimentally studied. The water temperature is divided into 20℃and 30℃by the temperature controller, and the water proportion of the water-cooled evaporator is controlled by the valve at three levels of 0%, 67% and 100%. Four groups of different working conditions are set for comparative study on the heating performance, and the changes in the inlet and outlet temperature and heat production of the water-cooled evaporator under different working conditions are analyzed. The variation of heat produced by double heat source heat pump and single air source heat pump in frost removal period was studied. The study shows that compared with the single air source system, the average COP of the dual heat source system during the three operating conditions was 2.26, 2.61 and 2.54, respectively, which increased by 34.1%,51.7% and 47.7% compared with the single air source system. Among them, the COP of the system in working conditions 2 and 3 can reach the highest of 3.04 and 3.44. The water-cooled evaporator with high temperature and large water proportion has obvious replenishment effect on the system. Under the same water quantity, the system energy efficiency ratio with high water temperature is better. At the same time, the heat replenishment of water source can improve the frost formation problem of the system. Compared with the dual heat source system, the defrosting time of the single air source system is longer and the effect is poor. Under the action of forced defrosting, part of the system's heat production is consumed, resulting in a lower COP than that of the dual heat source system.
关键词
热泵系统 /
性能系数 /
除霜 /
双热源 /
水量占比
Key words
heat pump systems /
coefficient of performance /
defrosting /
double heat source /
water proportion
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基金
京津冀科技创新协同项目（Z221100006022007）
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