Optimal control of the gas-cooler pressure of a CO2 heat pump using EEV opening and outdoor fan speed in the cooling mode

被引：51

作者：

Baek, Changhyun ^{[1
]}

Heo, Jaehyeok ^{[1
]}

Jung, Jongho ^{[1
]}

Cho, Honghyun ^{[2
]}

Kim, Yongchan ^{[1
]}

机构：

[1] Korea Univ, Dept Mech Engn, Seoul 136713, South Korea

[2] Chosun Univ, Dept Mech Engn, Kwangju 501753, South Korea

来源：

INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID | 2013年 / 36卷 / 04期

关键词：

CO2 heat pump; Gas-cooler pressure; Refrigerant charge; Electronic expansion valve opening; Outdoor fan speed; Compressor frequency; PERFORMANCE;

D O I：

10.1016/j.ijrefrig.2013.02.009

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The objective of this study is to investigate the control methods of the gas-cooler pressure in a CO2 heat pump. The cooling performance of the CO2 heat pump was measured by varying the refrigerant charge amount, EEV opening, compressor frequency, and outdoor fan speed at various outdoor temperatures. The effects of the EEV opening and the outdoor fan speed on the gas-cooler pressure and the COP were analyzed by using the experimental data. In the standard cooling condition at the compressor frequency of 45 Hz, the optimum gas-cooler pressure and the maximum COP were 9200 kPa and 3.04, respectively, at the optimum EEV opening of 41% and outdoor fan speed of 500 rpm. As the compressor frequency increased from 45 Hz to 55 Hz at the standard cooling condition, the optimum outdoor fan speed increased from 500 rpm to 700 rpm. (C) 2013 Elsevier Ltd and IIR. All rights reserved.

引用

页码：1276 / 1284

页数：9

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