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

Changhyun Baek; Jaehyeok Heo; Jongho Jung; Honghyun Cho; Yongchan Kim

doi:10.1016/j.ijrefrig.2013.02.009

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

Changhyun Baek, Jaehyeok Heo, Jongho Jung, Honghyun Cho, Yongchan Kim

School of Mechanical Engineering

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

47 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	1276-1284
Number of pages	9
Journal	International Journal of Refrigeration
Volume	36
Issue number	4
DOIs	https://doi.org/10.1016/j.ijrefrig.2013.02.009
Publication status	Published - 2013 Jun

Keywords

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

ASJC Scopus subject areas

Building and Construction
Mechanical Engineering

Access to Document

10.1016/j.ijrefrig.2013.02.009

Cite this

@article{a5458f6949e3452e9a5b89bbaabf7ced,

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

abstract = "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.",

keywords = "CO heat pump, Compressor frequency, Electronic expansion valve opening, Gas-cooler pressure, Outdoor fan speed, Refrigerant charge",

author = "Changhyun Baek and Jaehyeok Heo and Jongho Jung and Honghyun Cho and Yongchan Kim",

note = "Funding Information: This work was supported by the Korea Government Ministry of Knowledge Economy (No. 00014860-2010-34) and the Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea Government Ministry of Knowledge Economy . ",

year = "2013",

month = jun,

doi = "10.1016/j.ijrefrig.2013.02.009",

language = "English",

volume = "36",

pages = "1276--1284",

journal = "International Journal of Refrigeration",

issn = "0140-7007",

publisher = "Elsevier Limited",

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AU - Baek, Changhyun

AU - Heo, Jaehyeok

AU - Jung, Jongho

AU - Cho, Honghyun

AU - Kim, Yongchan

N1 - Funding Information: This work was supported by the Korea Government Ministry of Knowledge Economy (No. 00014860-2010-34) and the Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea Government Ministry of Knowledge Economy .

PY - 2013/6

Y1 - 2013/6

N2 - 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.

AB - 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.

KW - CO heat pump

KW - Compressor frequency

KW - Electronic expansion valve opening

KW - Gas-cooler pressure

KW - Outdoor fan speed

KW - Refrigerant charge

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