CAJ | 학술논문

为深入了解HFC125跨临界循环热泵热水器的运行特性,设计和建造了一个直流变频热泵热水器实验装置,对HFC125跨临界循环热泵热水器性能进行了实验研究,发现压缩机运行在95 Hz时系统存在一个COP峰值.然后以95 Hz为例,研究了系统COP与压缩机频率、冷凝压力、蒸发压力、冷却水温升、压缩机排气温度等参数的关系,并与R410A亚临界循环系统性能进行了比较.结果表明:系统存在一最优频率,此时系统有较好的COP值,系统COP随冷凝压力和压比的降低呈上升趋势,而蒸发压力基本恒定;当冷却水温升超过47.5℃时,COP迅速下降.相对R410A亚临界循环,HFC125跨临界循环系统COP显著提升,提高幅度平均在12%以上.
위심입료해HFC125과림계순배열빙열수기적운행특성,설계화건조료일개직류변빈열빙열수기실험장치,대HFC125과림계순배열빙열수기성능진행료실험연구,발현압축궤운행재95 Hz시계통존재일개COP봉치.연후이95 Hz위례,연구료계통COP여압축궤빈솔、냉응압력、증발압력、냉각수온승、압축궤배기온도등삼수적관계,병여R410A아림계순배계통성능진행료비교.결과표명:계통존재일최우빈솔,차시계통유교호적COP치,계통COP수냉응압력화압비적강저정상승추세,이증발압력기본항정;당냉각수온승초과47.5℃시,COP신속하강.상대R410A아림계순배,HFC125과림계순배계통COP현저제승,제고폭도평균재12%이상.
To evaluate the performance of heat pumps using refrigerant HFC125,an experimental rig of a DC-inverter heat pump water heater is designed and set up,and the research on the transcritical heat pump water heater is carried out experimentally.It is found that there is a top value of the coefficient of performance(COP)when the system runs at 95 Hz of frequency.The relationships between the COP and compressor frequency, condensation pressure, evaporation pressure,condensation water temperature rise,and discharge temperature are discussed and analyzed at 95 Hz.And the COP of the HFC125 transcritical cycle is also compared with that of a R410 subcritical heat pump under the same conditions.The results indicate that there exists an optimum frequency for a better COP,and the system COP shows an increasing tendency with the decrease in condensation pressure and compressor ratio while the evaporation pressure remains invariant,and the COP decreases rapidly when cooling water temperature rises over transcritical cycle significantly increases by 12% on average.