二氧化碳热泵热水器压缩机频率及电子膨胀阀的控制优化研究  

Experimental Study on the Control Optimization of Compressor Frequency and Electronic Expansion Valve With CO_(2) Heat Pump Water Heater

作　　者：郭亚宾 汪玉华 张政 刘娅锌 GUO Yabin;WANG Yuhua;ZHANG Zheng;LIU Yaxin(Department of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]郑州大学土木工程学院,郑州450001

出　　处：《工程热物理学报》2024年第12期3618-3625,共8页Journal of Engineering Thermophysics

基　　金：河南省重点研发与推广专项(科技攻关)项目(No.222102320051)。

摘　　要：跨临界二氧化碳热泵应用于热水器具有高制热能效、能制取高温热水的优点,其中排气压力是决定热泵系统是否能高效运行的重要参数之一。为了使系统在运行状态下实现最优排气压力,快速达到目标温度,针对初始控制策略进行了多方面的优化改进。结果说明了将排气温度值提高到105℃可以将平均排气压力提高0.2 MPa;减弱电子膨胀阀基于排气温度的控制力度可以使排气压力下限提高0.45 MPa,提高压缩机频率可以增加制热量,有效减短加热时间。Transcritical carbon dioxide heat pumps are used in water heaters because of their high heating efficiency and ability to produce hot water at high temperatures.The discharge pressure is one of the most important parameters in determining the operating efficiency of a heat pump system.In order to achieve the optimal discharge pressure and quickly reach the target temperature under operating conditions,several optimizations were made for the original control strategy.Experimental results showed that increasing the discharge temperature to 105℃ can increase the average discharge pressure by 0.2 MPa.The lower limit of the discharge pressure is increased by 0.45 MPa by weakening the electronic expansion valve control based on the discharge temperature.In addition,increasing the frequency of the compressor results in higher heat production and shorter heating time.

关 键 词：热泵热水器 二氧化碳 跨临界循环 优化 控制策略 

分 类 号：TK323[动力工程及工程热物理—热能工程]