Effects of the cylinder volume ratio of a twin rotary compressor on the heating performance of a vapor injection CO2 cycle

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

doi:10.1016/j.applthermaleng.2014.03.007

Effects of the cylinder volume ratio of a twin rotary compressor on the heating performance of a vapor injection CO₂ cycle

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

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

31 Citations (Scopus)

Abstract

The injection mass flow rate in a vapor injection CO₂ cycle is an important design factor to improve the heating performance of a heat pump at low ambient temperatures. The intermediate pressure in a twin rotary compressor strongly affects the injection mass flow rate, and can be adjusted by the cylinder volume ratio of the second-stage to the first-stage. In this study, the heating performances of the vapor injection CO₂ cycles including the flash tank vapor injection (FTVI) and sub-cooler vapor injection (SCVI) cycles were measured by varying the cylinder volume ratio of the twin rotary compressor at the ambient temperature of -15 °C. From the results, the optimum injection ratio yielding the maximum COP was determined for each cylinder volume ratio. In addition, in the FTVI and SCVI cycles, the optimum cylinder volume ratio was determined as 0.7 in order to achieve the maximum COP with the designed heating capacity.

Original language	English
Pages (from-to)	89-96
Number of pages	8
Journal	Applied Thermal Engineering
Volume	67
Issue number	1-2
DOIs	https://doi.org/10.1016/j.applthermaleng.2014.03.007
Publication status	Published - 2014 Jun

Bibliographical note

Funding Information:
This work was supported by the Human Resources Program in Energy Technology (No. 20124010203250 ) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea .

Keywords

Cylinder volume ratio
Heating performance
Twin rotary compressor
Two-stage
Vapor injection

ASJC Scopus subject areas

Energy Engineering and Power Technology
Industrial and Manufacturing Engineering

Access to Document

10.1016/j.applthermaleng.2014.03.007

Cite this

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title = "Effects of the cylinder volume ratio of a twin rotary compressor on the heating performance of a vapor injection CO2 cycle",

abstract = "The injection mass flow rate in a vapor injection CO2 cycle is an important design factor to improve the heating performance of a heat pump at low ambient temperatures. The intermediate pressure in a twin rotary compressor strongly affects the injection mass flow rate, and can be adjusted by the cylinder volume ratio of the second-stage to the first-stage. In this study, the heating performances of the vapor injection CO2 cycles including the flash tank vapor injection (FTVI) and sub-cooler vapor injection (SCVI) cycles were measured by varying the cylinder volume ratio of the twin rotary compressor at the ambient temperature of -15 °C. From the results, the optimum injection ratio yielding the maximum COP was determined for each cylinder volume ratio. In addition, in the FTVI and SCVI cycles, the optimum cylinder volume ratio was determined as 0.7 in order to achieve the maximum COP with the designed heating capacity.",

keywords = "Cylinder volume ratio, Heating performance, Twin rotary compressor, Two-stage, Vapor injection",

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

note = "Funding Information: This work was supported by the Human Resources Program in Energy Technology (No. 20124010203250 ) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea .",

year = "2014",

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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 Human Resources Program in Energy Technology (No. 20124010203250 ) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea .

PY - 2014/6

Y1 - 2014/6

N2 - The injection mass flow rate in a vapor injection CO2 cycle is an important design factor to improve the heating performance of a heat pump at low ambient temperatures. The intermediate pressure in a twin rotary compressor strongly affects the injection mass flow rate, and can be adjusted by the cylinder volume ratio of the second-stage to the first-stage. In this study, the heating performances of the vapor injection CO2 cycles including the flash tank vapor injection (FTVI) and sub-cooler vapor injection (SCVI) cycles were measured by varying the cylinder volume ratio of the twin rotary compressor at the ambient temperature of -15 °C. From the results, the optimum injection ratio yielding the maximum COP was determined for each cylinder volume ratio. In addition, in the FTVI and SCVI cycles, the optimum cylinder volume ratio was determined as 0.7 in order to achieve the maximum COP with the designed heating capacity.

AB - The injection mass flow rate in a vapor injection CO2 cycle is an important design factor to improve the heating performance of a heat pump at low ambient temperatures. The intermediate pressure in a twin rotary compressor strongly affects the injection mass flow rate, and can be adjusted by the cylinder volume ratio of the second-stage to the first-stage. In this study, the heating performances of the vapor injection CO2 cycles including the flash tank vapor injection (FTVI) and sub-cooler vapor injection (SCVI) cycles were measured by varying the cylinder volume ratio of the twin rotary compressor at the ambient temperature of -15 °C. From the results, the optimum injection ratio yielding the maximum COP was determined for each cylinder volume ratio. In addition, in the FTVI and SCVI cycles, the optimum cylinder volume ratio was determined as 0.7 in order to achieve the maximum COP with the designed heating capacity.

KW - Cylinder volume ratio

KW - Heating performance

KW - Twin rotary compressor

KW - Two-stage

KW - Vapor injection

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