摘要
为减少温室气体的排放并提升供热水系统性能,提出了双排气梯级加热空气源热泵系统(DCS),构建其热力学模型,以系统COP值为函数,对中间水温进行优化,并对DCS系统的性能进行分析,在5种低GWP值工质条件下与传统热泵系统进行了比较。结果表明:从系统COP值以及能源效率来看,DCS系统性能优于传统热泵系统,在最优中间水温下得到最大COP值,采用R1234ze(Z)的最优中间水温为32.5℃,系统最大COP值为4.50;相对传统热泵系统,采用DCS系统COP值最高提升22.57%;所研究的5种工质中,DCS系统的最优中间水温均随环境温度升高而升高,其中最大升高10.31℃,最小升高4.72℃;当环境温度为10℃时,采用R1234ze(Z)的DCS系统一、二级压缩比分别比传统热泵系统降低了42.43%、69.94%;与传统热泵系统相比,DCS系统一、二级压缩机单位容积制热量分别最高提升6.07%、259.10%。
In order to reduce greenhouse gas emissions and improve the performance of hot water supply system,a dual discharge vapor cascade heating air source heat pump system(DCS)is proposed.The thermodynamic model is constructed,and the intermediate water temperature is optimized as a function of system COP.Then the performance of the DCS system is analyzed,and the performance of the DCS system is compared with the traditional heat pump system under five low GWP working fluid conditions.The results show that from the perspective of system COP value and energy efficiency,the performance of DCS system is better than that of traditional heat pump system.The maximum COP value is obtained under the optimal intermediate water temperature,and the optimal intermediate water temperature with R1234ze(Z)is 32.5℃,and the maximum COP value of the system is 4.50.The energy efficiency of the system can be significantly improved by 22.57%compared with the traditional heat pump system.Among the five working fluids studied,the optimal intermediate water temperature of the DCS system increased with the increase of ambient temperature,with a maximum increase of 10.31℃and a minimum increase of 4.72℃.When the ambient temperature was 10℃,the compression ratios of the first and second stages of the DCS system using R1234ze(Z)were reduced by 42.43%and 69.94%respectively compared with the traditional heat pump system.Compared with the traditional heat pump system,the heating capacity per unit volume of the first and second stage compressors of the DCS system is increased by up to 6.07%and 259.10% respectively.
作者
管海清
阳白术
代宝民
刘圣春
Guan Haiqing;Yang Baishu;Dai Baomin;Liu Shengchun(Panasonic R&D Center Suzhou Co.,Ltd.;Tianjin University of Commerce)
出处
《制冷与空调》
2025年第9期43-49,共7页
Refrigeration and Air-Conditioning
基金
国家自然科学基金项目(52476085)。
关键词
双排气
梯级加热
空气源热泵
系统优化
COP值
dual discharge vapor
cascade heating
air source heat pump
system optimization
COP
