摘要
提出了一种新型部分自复叠热泵,通过调节复叠率,该热泵可以控制压缩机的排气温度在安全温度(120℃)以内,并且把水加热到生活用热水所要求的温度(55℃),同时使热泵达到最高的能效比(COP).采用Matlab调用NIST制冷剂物性数据库Refprop 7.1编程对该热泵进行理论计算,分析了压缩机排气温度和热泵COP的影响因素,确定了最佳运行状态.理论计算结果表明:采用该新型部分自复叠热泵,可使压缩机排气温度下降30℃左右,当工质R22质量分数为0.28、冷凝器出口温度为55℃时,调节复叠率为0.717,可使压缩机排气温度降低至120℃,系统COP达到2.214.
A new partial auto-cascade heat pump （NPACHP） was proposed in this study. By adjusting the auto-cascade ratio, the NPACHP can obtain the safe discharge temperature of the compressor （≤120 ℃） and the required water temperature （55 ℃）. The performance of the NPACHP system was calculated with Matlab and refrigerants property database Refprop 7.1 of NIST, and the factors influencing the discharge temperature of the compressor and the COP were analyzed. The best running state of the NPACHP was also determined. The results show that the NPACHP can reduce the discharge temperature of the compressor by about 30 ℃. The compressor discharge temperature can drop to 120 ℃ and the COP can be 2. 214 when the autocascade ratio of the NPACHP is 0. 717, the mass fraction of R22 is 0.28 and the outlet temperature of the condenser is 55 ℃.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2012年第3期15-20,共6页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(50776064)
关键词
部分自复叠
压缩机排气温度
热泵能效比
最佳运行状态
partial auto-cascade
exhaust temperature of compressor
COP of heat pump
bestrunning state
