CAJ | 학술논문

通过改变压缩机频率，实现低高压压缩机理论输气量不同配比，对变容量双级压缩热泵系统进行实验研究，分析系统中间压力、中间温度和制冷剂循环量等参数随低高压压缩机理论输气量比的变化规律。实验结果表明：该系统在较低蒸发温度时，通过增大低高压压缩机理论输气量比可有效提高系统制热量，但系统制热COP改善较小；随蒸发温度的降低，系统制热COP最优值所对应的低高压压缩机理论输气量比将遵循增大的规律。同时指出该系统在蒸发温度0℃，冷凝温度40℃，低高压压缩机理论输气量比为2．82时，系统中间压力已接近冷凝压力，系统失去中间喷射的补气增焓效果。该研究为双级压缩系统性能的研究及其优化设计提供了有力的参考。
통과개변압축궤빈솔，실현저고압압축궤이론수기량불동배비，대변용량쌍급압축열빙계통진행실험연구，분석계통중간압력、중간온도화제랭제순배량등삼수수저고압압축궤이론수기량비적변화규률。실험결과표명：해계통재교저증발온도시，통과증대저고압압축궤이론수기량비가유효제고계통제열량，단계통제열COP개선교소；수증발온도적강저，계통제열COP최우치소대응적저고압압축궤이론수기량비장준순증대적규률。동시지출해계통재증발온도0℃，냉응온도40℃，저고압압축궤이론수기량비위2．82시，계통중간압력이접근냉응압력，계통실거중간분사적보기증함효과。해연구위쌍급압축계통성능적연구급기우화설계제공료유력적삼고。
A two-stage heat pump system with variable capacity is studied, through varying the compressor frequency to a-chieve different ratios of theoretical displacement of the low compressor to that of the high one.In addition, the intermediate pressure, the intermediate gas temperature and the refrigerant mass flow are analyzed.The results show that increasing the ratio of theoretical displacement of the low compressor to that of the high one can improve the heating capacity at low evapo-ration temperature.But the heating COP improves a little.And the ratio of theoretical displacement of the low compressor to that of the high one corresponding to the optimal heating COP increases with the decreasing of the evaporation temperature. Moreover, when the evaporation and condensation temperatures are 0℃and 40℃respectively, and the ratio of theoretical displacement of the low compressor to that of the high one is 2.82, it is shown that the intermediate pressure gets close to the condensation pressure and the enthalpy-increasing effect of the vapor injection disappears.This paper would be used to study and optimize the design of the two-stage compression heat pump system.