一种用于供暖的改进式机械过冷跨临界CO_(2)热泵  

A Modified Transcritical CO_(2) Heat Pump With Mechanical Subcooling for Heating

作　　者：何宇佳 成家豪 常萌萌 邵亮亮[1] 张春路[1] HE Yu-Jia;CHENG Jia-Hao;CHANG Meng-Meng;Shao Liang-Liang;ZHANG Chun-Lu(School of Mechanical Engineering,Tongji University,Shanghai 201804,China)

机构地区：[1]同济大学机械与能源工程学院,上海201804

出　　处：《工程热物理学报》2021年第11期2771-2774,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.52076150)。

摘　　要：采用机械过冷可以有效改善跨临界CO_(2)热泵用于供暖的性能。本文在此基础上提出了一种优化热水加热过程的新方案。热泵系统中的水路由并联改为串联,CO_(2)气冷器被拆分为二,回水依次经CO_(2)气冷器1、辅助循环冷凝器和CO_(2)气冷器2三段加热,制冷剂–水换热温差均匀性得到显著改善。利用仿真模型,研究了热水侧总换热面积一定时,辅助循环冷凝器和CO_(2)循环气冷器换热面积分配对系统性能的影响。结果表明,在最优换热面积分配下,改进式系统的COP可提升1.9%∼7.2%。换热流体温差越大,环境温度越高,COP提升越显著。Mechanical subcooling can effectively improve the performance of transcritical CO_(2) heat pump for heating.In this work,a novel scheme to optimize the hot water heating process is proposed.The CO_(2) gas cooler is divided into two parts,and the return water is sequentially heated by gas cooler 1,condenser and gas cooler 2.The temperature difference uniformity of refrigerant water heat transfer is significantly improved.Simulation models were used to study the impact of heat transfer area allocation on system performance.The results show that COP of modified system can be increased by 1.9%∼7.2%under the optimal heat transfer area allocation.

关 键 词：住宅供暖 跨临界CO_(2)循环 机械过冷 温度场协同性 

分 类 号：TB65[一般工业技术—制冷工程]