Experimental investigation on the influence of internal heat exchanger in a transcritical CO2 heat pump water heater

被引：78

作者：

Cao, Feng ^{[1
]}

Ye, Zuliang ^{[1
]}

Wang, Yikai ^{[1
]}

机构：

[1] Xi An Jiao Tong Univ, Sch Energy & Power Engn, 28 Xianning West Rd, Xian 710049, Peoples R China

来源：

APPLIED THERMAL ENGINEERING | 2020年 / 168卷 / 168期

基金：

中国国家自然科学基金;

关键词：

Transcritical CO2 heat pump; Internal heat exchanger; Experimental investigation; Exergy analysis; EXERGY ANALYSIS; SYSTEM; ENERGY; PERFORMANCE; PRESSURE; CYCLE;

D O I：

10.1016/j.applthermaleng.2019.114855

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

In this paper, a transcritical CO2 heat pump water heater prototype was experimentally investigated to research the influence of internal heat exchanger (IHX). In addition, the exergy analysis was carried out based on the experimental data. The results showed that the optimal discharge pressure reduced with the application of IHX, and this reduction could be amplified by the decrease of the ambient temperature, the increase of the water inlet temperature and the increase of the water outlet temperature. From the energy point of view, under the optimal discharge pressure, the coefficient of performance (COP) increased by up to 6.65% and the total power consumption decreased by up to 6.22% via using IHX. Then the influence of IHX on the heat pump cycle was discussed. The results of the exergy analysis showed that the exergy destruction of compressor, gas cooler and evaporator increased, and the exergy destruction of expansion valve decreased with the application of IHX. Furthermore, the product exergy and the total exergy destruction increased, and the exergy efficiency of system decreased in all working conditions. In conclusion, the application of IHX enhanced the energy performance and impaired the exergy efficiency in this research.

引用

页数：11

共 24 条

[1] Bejan A., 1995, Thermal Design and Optimization
[2] The optimum high pressure for CO2 transcritical refrigeration systems with internal heat exchangers
Chen, Y
Gu, JJ
[J]. INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID, 2005, 28 (08): : 1238 - 1249
[3] Evaluation of transcritical CO2 heat pump system integrated with mechanical subcooling by utilizing energy, exergy and economic methodologies for residential heating
Dai, Baomin
Qi, Haifeng
Liu, Shengchun
Ma, Muyu
Zhong, Zhifeng
Li, Hailong
Song, Mengjie
Sun, Zhili
[J]. ENERGY CONVERSION AND MANAGEMENT, 2019, 192 : 202 - 220
[4] Second law analysis of the transcritical CO2 refrigeration cycle
Fartaj, A
Ting, DSK
Yang, WW
[J]. ENERGY CONVERSION AND MANAGEMENT, 2004, 45 (13-14) : 2269 - 2281
[5] Comparison of CO2 heat pump water heater performance with baseline cycle and two high COP cycles
Fernandez, Nicholas
Hwang, Yunho
Radermacher, Reinhard
[J]. INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID, 2010, 33 (03): : 635 - 644
[6] Effects of using expander and internal heat exchanger on carbon dioxide direct-expansion geothermal heat pump
Ghazizade-Ahsaee, Hossein
Ameri, Mehran
[J]. APPLIED THERMAL ENGINEERING, 2018, 136 : 389 - 407
[7] Comparison of transcritical CO2 refrigeration cycle with expander and throttling valve including/excluding internal heat exchanger: Exergy and energy points of view
Joneydi Shariatzadeh, O.
Abolhassani, S. S.
Rahmani, M.
Nejad, M. Ziaee
[J]. APPLIED THERMAL ENGINEERING, 2016, 93 : 779 - 787
[8] The performance of a transcritical CO2 cycle with an internal heat exchanger for hot water heating
Kim, SG
Kim, YJ
Lee, G
Kim, MS
[J]. INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID, 2005, 28 (07): : 1064 - 1072
[9] Klein S.A., 2000, INT J REFRIG
[10] Energetic, economic and environmental analysis of air source transcritical CO2 heat pump system for residential heating in China
Liu, Shengchun
Li, Zheng
Dai, Baomin
Zhong, Zhifeng
Li, Hailong
Song, Mengjie
Sun, Zhili
[J]. APPLIED THERMAL ENGINEERING, 2019, 148 : 1425 - 1439

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