跨临界CO_(2)热泵联合调控优化的试验研究  

Experimental study on joint regulation and optimization of the transcritical CO_(2) heat pump system

作　　者：丁夏杰 陶乐仁[1] 任凯 DING Xiajie;TAO Leren;REN Kai(College of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《流体机械》2022年第11期1-7,36,共8页Fluid Machinery

基　　金：国家高科技研究发展计划项目(2008AA05Z204);上海市动力工程多相流动与传热重点实验室基金项目(1N-15-301-101)。

摘　　要：为了优化变频跨临界CO_(2)空气源热泵系统性能,提出了一种对压缩机频率、电子膨胀阀开度和冷却水流量进行联合调控的控制策略,通过试验研究了这种调控方法对于热泵系统性能的影响,并与单一部件参数的调控方法进行对比。结果表明:其他条件不变时,随着蒸发器出口过热度不断增大,系统制热量先增大后减小,存在最大值,而COP不断下降;而在获得最大制热量的基础上改变冷却水流量,系统制热量和COP提高与水流量呈正相关,排气压力和出水温度呈负相关,且压缩机频率越大,变化越明显,而压缩机耗功几乎不变。相比于单部件调控,这种联合调控方式在压缩机频率为75 Hz时使系统制热量和COP增幅最大,分别为28.1%和15.3%,因此这种联合调控方法可以有效地优化热泵系统性能。A control strategy for joint regulation of compressor frequency, electronic expansion valve opening and cooling water flow was proposed to optimize the performance of transcritical CO_(2) air source heat pump. The influence of this regulation method on the performance of heat pump system was studied experimentally and compared with the regulation method of single component parameters. The results show that the heating capacity of the system increases first and then decreases with the increasing superheat of evaporator outlet and there is a maximum value when other parameters remain unchanged, and COP decreases continuously.When the cooling water flow is changed on the basis of obtaining the maximum heating capacity, the system heating capacity and COP increase are positively correlated with the water flow, and the exhaust pressure and outlet water temperature are negatively correlated. The greater the compressor frequency is, the more obvious the change is, whereas the compressor power consumption is almost unchanged. Compared with single component regulation, this combined regulation mode maximizes the increase of system heating capacity and COP when the compressor frequency is 75 Hz, which are 28.1% and 15.3% respectively, therefore, this joint regulation method can effectively optimize the performance of heat pump system.

关 键 词：CO_(2)热泵 压缩机频率 系统性能 

分 类 号：TH3[机械工程—机械制造及自动化] TB61[一般工业技术—制冷工程]