相变蓄热材料用于热泵空调强化除霜理论研究
Theoretical analysis of air condition system for intensifying defrosting with latent energy storage material
付梦婷 1包睿祺 1赵汀 1沈九兵1
作者信息
摘要
家用热泵型空调器在除霜模式下缺少低位热源,且无法实现室内的持续供暖,文章针对以上的问题,在原有热泵系统基础上增设相变蓄热换热器,提出了一种多功能相变蓄热空调系统,并基于能量守恒原理,利用制冷剂压焓图、湿空气焓湿图对该系统的过冷蓄热模式、供暖除霜模式进行了初步理论分析.进一步选取了多种相变蓄热材料,并通过在 10～25℃范围内改变系统的蒸发温度来表征不同蓄热材料应用时的相变温度,进而通过理论计算研究不同蓄热材料相变温度下除霜时间、系统能效比的变化,为相变蓄热材料的选取提供理论依据.分析表明,随着材料的相变温度升高,压缩机功率下降幅度明显,除霜功率线性增加,COP值从 5.7 上升至 8.9,除霜时间较传统模式缩短约 80%.
Abstract
The household air condition lacks a low-temperature heat source in defrost-ing mode and cannot realize the continuous heat supply indoors.The paper proposes a multifunctional heat-storing air condition system by combining a phase-change heat-storing exchanger to the original heat pump system.Based on the principle of energy con-servation,the article conducts preliminary theoretical analysis of the main process of the system using the refrigerant pressure-enthalpy diagram and the moist-air enthalpy-humidity diagram.Furthermore,several phase-change heat-storing materials are selected,and the phase change temperature of them is represented by different evaporation tempera-ture within the range of 10℃to 25℃.Then the changes in defrosting time and system COP at different phase change temperatures of the heat-storing materials are investigated through theoretical calculation,providing a theoretical basis for the selection of phase-change heat-storing materials.The analysis demonstrates that as the phase-change temper-ature increases,the power consumption of the compressor decreases significantly,the de-frosting power linearly increases,the COP increases from 5.7 to 8.9,and the defrosting time is reduced by about 80%compared to the traditional mode.
关键词
空气调节器/蓄热/除霜/相变温度/能效比Key words
air condition/thermal storage/defrosting/phase transition temperature/co-efficient of performance引用本文复制引用
出版年
2024
NETL
NSTL
万方数据