
设计研究 1 Design&Research
冰箱用压缩机变工况运行的热力性能实验研究王晓燕",沈希”,翁孟超
(1.浙江师范大学工学院,浙江金华321004;2.浙江工业大学机械工程学院,浙江杭州310014)[摘要]:采用实验的方法,以R600a为工质,吸排气压力为自变量,分析了吸排气压力对往复压缩机的热力性能影响。实验结果表明:在其他参数不变时,提高吸气压力使制冷量和功耗增加,但固制冷量增幅比功耗增幅大,故性能系数COP增加;提高排气压力造成压缩机制冷量降低,功耗反而增大,COP星著降低,排气温度先降低后升高,运行经济性变差。
[关键词]:往复压缩机;安工况;计算模型;热力性能
中图分类号:TH457文献标志码:A 文章编号:1006-2971(2015)06001205
Experimental StudyonThermodynamicPerformanceofRefrigeratorCompressorRunning atVariableCondition
WANG Xiaoyan', SHEN Xi2, WENG Mengchao
(1. College of Engineering, Zhejiang Normal University, Jinhua 321004, China; 2. College of Mechanical Engineering, Zhejiang University of Tech nology, Hangzhou 310014, China)
Abstract:The paper adopts the method of experiment, the reciprocating compressor takes R60Oa as the refrigerant and suction and discharge pressure as the independent variable, analyses the impact of suction and discharge pressure on the thermodynamic perfor-mance. The experiment result shows that elevation of suction will increase the refrigeration capacity and power consumption with oth er parameters unchanged, but the growth range of refrigeration capacity is greater than power consumption, so coefficient of perfor-mance(COP) increases. The increasing of discharge pressure will make the refrigeration capacity of compressor reduce, power con-sumption increase, coefficient of performance (COP) significantly reduce, the discharge temperature reduce at first and rise afterwards, and this will make the operational efficiency of reciprocating compressor worse.
Key words: reciprocating compressor; variable condition; calculation model; thermodynamic performance
1引信言
压缩机是电冰箱的核心部件和动力源,能耗占家用冰箱总能耗的80%以上,其热力性能的好坏直接关系到整个冰箱性能的优务,因而全面、透彻地分析压缩机热力性能是电冰箱节能的关键1-3)。但因受其周围环境等因素影响,使之在实际运行时偏离额定状态点,处于变工况运行,其工作状态大幅度变化,且常处于瞬变温压、油气混合等
收稿日期:2015-08-31
基金项目:浙江省教育厅一般项目(Y201225635)
压缩机技术 12/Compresu技m
状况,因此对其研究显得尤为困难和复杂用。目前,部分学者在制冷压缩机计算模型和性能仿真实验方面开展了一些研究15-},得出了一些有益结论,为继续开展变工况研究提供了理论依据。文章在前期工作基础上,依据热力学和动力学理论,建立了往复式制冷压缩机控制容积计算模型,采用“第二制冷剂量热器法”,研究吸排气压力对冰箱用往复压缩机制冷量、功率消耗、性能系数(COP)以及排气温度等参数的影响。
2015年06期(总第254期)需