Optimum cycle control of a two-stage injection heat pump with a double expansion sub-cooler

Jaehyeok Heo; Hoon Kang; Yongchan Kim

doi:10.1016/j.ijrefrig.2011.09.005

Optimum cycle control of a two-stage injection heat pump with a double expansion sub-cooler

Jaehyeok Heo, Hoon Kang, Yongchan Kim

Research output: Contribution to journal › Article › peer-review

42 Citations (Scopus)

Abstract

The refrigerant injection technique has rapidly developed in recent years due to its outstanding performance at low ambient temperatures, and various control methods for a heat pump with injection have been presented. However, most studies on cycle control have been theoretical, and practical control methods for cycle optimization based on experimental results hardly have been presented. In this study, an optimum cycle control method was proposed for a refrigerant injection heat pump with a double expansion sub-cooler based on the intermediate pressure and the injection ratio. The optimum sub-cooler pressure ratio was proposed from 0.4 to 0.7 in view of the heating capacity, and from 0.7 to 0.8 in view of the COP. The optimum injection ratio increased from 0.1 to 0.3 with an increase in the compression ratio.

Original language	English
Pages (from-to)	58-67
Number of pages	10
Journal	International Journal of Refrigeration
Volume	35
Issue number	1
DOIs	https://doi.org/10.1016/j.ijrefrig.2011.09.005
Publication status	Published - 2012 Jan

Bibliographical note

Funding Information:
This research was supported by a Korea University Grant and the Korea Institute of Energy Technology Evaluation and Planning (Grant No. 2010T100200474 ).

Keywords

Control
Heat pump
Injection
Optimization
Two-stage

ASJC Scopus subject areas

Building and Construction
Mechanical Engineering

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10.1016/j.ijrefrig.2011.09.005

Cite this

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abstract = "The refrigerant injection technique has rapidly developed in recent years due to its outstanding performance at low ambient temperatures, and various control methods for a heat pump with injection have been presented. However, most studies on cycle control have been theoretical, and practical control methods for cycle optimization based on experimental results hardly have been presented. In this study, an optimum cycle control method was proposed for a refrigerant injection heat pump with a double expansion sub-cooler based on the intermediate pressure and the injection ratio. The optimum sub-cooler pressure ratio was proposed from 0.4 to 0.7 in view of the heating capacity, and from 0.7 to 0.8 in view of the COP. The optimum injection ratio increased from 0.1 to 0.3 with an increase in the compression ratio.",

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AU - Kang, Hoon

AU - Kim, Yongchan

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N2 - The refrigerant injection technique has rapidly developed in recent years due to its outstanding performance at low ambient temperatures, and various control methods for a heat pump with injection have been presented. However, most studies on cycle control have been theoretical, and practical control methods for cycle optimization based on experimental results hardly have been presented. In this study, an optimum cycle control method was proposed for a refrigerant injection heat pump with a double expansion sub-cooler based on the intermediate pressure and the injection ratio. The optimum sub-cooler pressure ratio was proposed from 0.4 to 0.7 in view of the heating capacity, and from 0.7 to 0.8 in view of the COP. The optimum injection ratio increased from 0.1 to 0.3 with an increase in the compression ratio.

AB - The refrigerant injection technique has rapidly developed in recent years due to its outstanding performance at low ambient temperatures, and various control methods for a heat pump with injection have been presented. However, most studies on cycle control have been theoretical, and practical control methods for cycle optimization based on experimental results hardly have been presented. In this study, an optimum cycle control method was proposed for a refrigerant injection heat pump with a double expansion sub-cooler based on the intermediate pressure and the injection ratio. The optimum sub-cooler pressure ratio was proposed from 0.4 to 0.7 in view of the heating capacity, and from 0.7 to 0.8 in view of the COP. The optimum injection ratio increased from 0.1 to 0.3 with an increase in the compression ratio.

KW - Control

KW - Heat pump

KW - Injection

KW - Optimization

KW - Two-stage

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Optimum cycle control of a two-stage injection heat pump with a double expansion sub-cooler

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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