Performance characteristics of a two-stage CO2 heat pump water heater adopting a sub-cooler vapor injection cycle at various operating conditions

被引：61

作者：

Baek, Changhyun ^{[1
]}

Heo, Jaehyeok ^{[2
]}

Jung, Jongho ^{[1
]}

Cho, Honghyun ^{[3
]}

Kim, Yongchan ^{[1
]}

机构：

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

[2] Korea Inst Energy Res, New & Renewable Energy Res Div, Taejon 305343, South Korea

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

来源：

ENERGY | 2014年 / 77卷

关键词：

CO2 heat pump water heater; Hot water temperature; Injection ratio; Vapor injection; Water heating performance; SYSTEM; PRESSURE;

D O I：

10.1016/j.energy.2014.09.038

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 performance characteristics of an injection CO2 (carbon dioxide) HPWH (heat pump water heater) at various operating conditions. In the standard and standby heat loss test conditions, the performance of a two-stage CO2 HPWH adopting a SCVI (sub-cooler vapor injection HPWH) cycle was measured and analyzed by varying the compressor frequency, the water flow rate, and the injection ratio at various outdoor temperatures. In the standard tests at the outdoor temperature of -15 degrees C, the COP (coefficient of performance) of the optimized SCVI HPWH was 7.6% higher than that of the non-injection HPWH. During the standby loss tests at the water flow rate of 200 kg h(-1), the COP of the optimized SCVI HPWH was 7.1% higher than that of the non-injection HPWH. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：570 / 578

页数：9

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