带喷射器的CO_(2)水源热泵空调夏季性能分析

Analysis of Summer Performance of a CO Ground-Water Air Conditioning System with an Ejector

提出了一种能够驱动一次回风空气处理机组的带喷射器的跨临界CO_(2)地下水源热泵空调机组。基于热力学原理和喷射器一维等压混合模型,建立了系统夏季稳态性能分析数值模型,利用MATLAB软件进行了计算。结果表明:在地下水温和新风相对湿度较低,且新风比和新风温度较高的条件下,系统性能系数(COP)较大;地下水温较高时,系统存在最优排气压力,且地下水温越高,最优排气压力越大。喷射器有利于提高系统性能,扩展系统适用范围。地下水温和压缩机排气压力是影响喷射器效率和系统性能提升的主要因素。在地下水温和压缩机排气压力较高时,喷射器对系统性能提升百分比影响较大。

A novel trans-critical CO_(2) ground water heat pump air conditioning unit with an ejector was introduced.The numerical model for performance analysis of the system under steady working condition in summer was established based on thermodynamic principles and the ejector constant-pressure mixing model.The model was calculated by using MATLAB software.The results show that the low ground water temperature and fresh air relative humidity,combined with high fresh air ratio and temperature,lead to high COP.There is an optimal compressor discharge pressure when the ground water temperature is high,and it increases as the ground water temperature goes up.Introducing ejector into the system can improve its COP and expand its applicable region.Ejector efficiency and system COP improvement are mainly affected by ground water temperature and compressor discharge pressure.The ejector has a major effect on the percentage improvement in system performance under high ground water temperature and high compressor discharge pressure.