The optimal charge of carbon dioxide in water–water heat pump systems with and without an internal heat exchanger

Zhili Sun; Shengchun Liu; Youcai Liang; Mengjie Song; Jianghe Guo

doi:10.1080/1023697X.2017.1317039

The optimal charge of carbon dioxide in water–water heat pump systems with and without an internal heat exchanger

Zhili Sun, Shengchun Liu^*, Youcai Liang, Mengjie Song, Jianghe Guo

^*Corresponding author for this work

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

13 Citations (Scopus)

Abstract

An experimental study was conducted on the optimal charge of carbon dioxide in water–water heat pump systems (WWHPSs) with and without an internal heat exchanger (IHX). An appropriate carbon dioxide charge standard was obtained from the experimental results. All tests were conducted with the inlet and outlet water temperatures set to 12°C and 7°C in the evaporator, respectively and 20°C and 55°C in the gas cooler, respectively. During the tests, the evaporation temperature was 0°C. The coefficient of performance of cooling (COPc) and coefficient of performance of heating (COPh) increased by 8.3% and 0.7% in the WWHPS with an IHX compared with the WWHPS without an IHX. Under the test conditions, the optimal carbon dioxide charges with and without an IHX were found to be 2.0 kg and 2.25 kg, respectively. The test results show that the optimal carbon dioxide charge decreases by 11.1% when an IHX is included in the WWHPS.

Original language	English
Pages (from-to)	99-106
Number of pages	8
Journal	Transactions Hong Kong Institution of Engineers
Volume	24
Issue number	2
DOIs	https://doi.org/10.1080/1023697X.2017.1317039
Publication status	Published - 3 Apr 2017
Externally published	Yes

Keywords

Carbon dioxide
charge
heat pump
internal heat exchanger

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10.1080/1023697X.2017.1317039

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title = "The optimal charge of carbon dioxide in water–water heat pump systems with and without an internal heat exchanger",

abstract = "An experimental study was conducted on the optimal charge of carbon dioxide in water–water heat pump systems (WWHPSs) with and without an internal heat exchanger (IHX). An appropriate carbon dioxide charge standard was obtained from the experimental results. All tests were conducted with the inlet and outlet water temperatures set to 12°C and 7°C in the evaporator, respectively and 20°C and 55°C in the gas cooler, respectively. During the tests, the evaporation temperature was 0°C. The coefficient of performance of cooling (COPc) and coefficient of performance of heating (COPh) increased by 8.3% and 0.7% in the WWHPS with an IHX compared with the WWHPS without an IHX. Under the test conditions, the optimal carbon dioxide charges with and without an IHX were found to be 2.0 kg and 2.25 kg, respectively. The test results show that the optimal carbon dioxide charge decreases by 11.1% when an IHX is included in the WWHPS.",

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author = "Zhili Sun and Shengchun Liu and Youcai Liang and Mengjie Song and Jianghe Guo",

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AU - Sun, Zhili

AU - Liu, Shengchun

AU - Liang, Youcai

AU - Song, Mengjie

AU - Guo, Jianghe

PY - 2017/4/3

Y1 - 2017/4/3

N2 - An experimental study was conducted on the optimal charge of carbon dioxide in water–water heat pump systems (WWHPSs) with and without an internal heat exchanger (IHX). An appropriate carbon dioxide charge standard was obtained from the experimental results. All tests were conducted with the inlet and outlet water temperatures set to 12°C and 7°C in the evaporator, respectively and 20°C and 55°C in the gas cooler, respectively. During the tests, the evaporation temperature was 0°C. The coefficient of performance of cooling (COPc) and coefficient of performance of heating (COPh) increased by 8.3% and 0.7% in the WWHPS with an IHX compared with the WWHPS without an IHX. Under the test conditions, the optimal carbon dioxide charges with and without an IHX were found to be 2.0 kg and 2.25 kg, respectively. The test results show that the optimal carbon dioxide charge decreases by 11.1% when an IHX is included in the WWHPS.

AB - An experimental study was conducted on the optimal charge of carbon dioxide in water–water heat pump systems (WWHPSs) with and without an internal heat exchanger (IHX). An appropriate carbon dioxide charge standard was obtained from the experimental results. All tests were conducted with the inlet and outlet water temperatures set to 12°C and 7°C in the evaporator, respectively and 20°C and 55°C in the gas cooler, respectively. During the tests, the evaporation temperature was 0°C. The coefficient of performance of cooling (COPc) and coefficient of performance of heating (COPh) increased by 8.3% and 0.7% in the WWHPS with an IHX compared with the WWHPS without an IHX. Under the test conditions, the optimal carbon dioxide charges with and without an IHX were found to be 2.0 kg and 2.25 kg, respectively. The test results show that the optimal carbon dioxide charge decreases by 11.1% when an IHX is included in the WWHPS.

KW - Carbon dioxide

KW - charge

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KW - internal heat exchanger

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The optimal charge of carbon dioxide in water–water heat pump systems with and without an internal heat exchanger

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Keywords

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