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Simulation and Experimental Analysis on the Optimal Discharge Pressure of a Transcritical CO 2 Heat Pump System
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[1]Wang Di,Wang Dingbiao,Yang Yuxi,et al.Simulation and Experimental Analysis on the Optimal Discharge Pressure of a Transcritical CO 2 Heat Pump System[J].Journal of Zhengzhou University (Engineering Science),2021,42(04):33-39.[doi:10.13705/j.issn.1671-6833.2021.04.001]
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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 42卷 Number of periods: 2021 04 Page number: 33-39 Column: Public date: 2021-07-30
Title:
Simulation and Experimental Analysis on the Optimal Discharge Pressure of a Transcritical CO 2 Heat Pump System
Author(s):
Wang Di; Wang Dingbiao; Yang Yuxi; Liu Xinxin; Xiang Yan;
School of Mechanical and Power Engineering of Zhengzhou University; Energy Sales Technology and Equipment Education Research Center of Zhengzhou University Thermal Energy System;
Keywords:
intermediate heat exchanger; across the critical CO2; MATLAB; optimal exhaust pressure; correlations
CLC:
-
DOI:
10.13705/j.issn.1671-6833.2021.04.001
Abstract:
To explore the impact of operating variables on the system optimal exhaust pressure,the influence of the system simulation model was built based on the MATLAB platform.It analyzed the specific conditions,in the presence of the heat exchanger in the middle of the case,the system would effect COP of the system,the variables to determine the main factors affecting the optimal exhaust pressure system,and fitting the corresponding correlations.At the same time,the influence of exhaust pressure on the system performance was studied under different evaporation temperature and air cooler outlet temperature by using the cross-critical CO2 heat pump system test platform.And the corresponding optimal exhaust pressure value under different working conditions was obtained,which was verified by comparison with the simulation value of optimal exhaust pressure.The results show that there was an optimal exhaust pressure in the system,and COP of the system could reaches the maximum under this pressure.With the addition of intermediate heat exchanger,COP of the system increased somewhat,but the optimal exhaust pressure was almost unchanged.High dryness and superheat had little effect on COP of the system.COP of the system decreased sharply with the increase of the outlet temperature of the air cooler,and increased with the increase of the evaporation temperature.The optimal exhaust pressure was mainly related to the outlet temperature of the air cooler and the evaporation temperature.The maximum error between the optimal exhaust pressure obtained by experiment and that obtained by simulation was 3%,the correlation formula of optimal exhaust pressure fitted by simulation was well matched with the actual operation process.
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Last Update: 2021-08-26
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