Simulation of the optimal heat rejection pressure for transcritical CO<sub>2</sub> expander cycle

doi:10.1007/s11708-010-0027-8

Front Energ Power Eng Chin

2010, Vol. 4

Issue (4) : 522-526 https://doi.org/10.1007/s11708-010-0027-8

RESEARCH ARTICLE

Simulation of the optimal heat rejection pressure for transcritical CO₂ expander cycle

Junlan YANG¹(

), Yitai MA², Minxia LI², Hua TIAN²

1. Department of Energy and Mechanical Engineering, Tianjin Institute of Urban Construction, Tianjin 300384, China; 2. Thermal Energy Research Institute, Tianjin University, Tianjin 300072, China

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Abstract

In order to optimize and control transcritical CO₂ refrigeration cycle, a mathematical model was developed to simulate the system performance. The simulation results show that a maximum COP exists at the optimal heat rejection pressure not only for throttle valve cycle but also for expander cycle. Also, the optimal heat rejection pressures of the throttle valve cycle are greater than those of the expander cycle under the same condition. In order to further obtain correlation of the optimal heat rejection pressure for transcritical CO₂ expander cycle, it is necessary to analyze the impact degree of compressor efficiency, expander efficiency, gas cooler outlet temperature and evaporation temperature. Based on the simulation results, the values of the optimal heat rejection pressure for the expander cycle were regressed in terms of gas cooler outlet temperature and evaporation temperature at given compressor efficiency and expander efficiency. Finally, two types of polynomial correlations were obtained. One is cubic form, with an average deviation of less than 0.5% and the other is simplified form, with an average deviation of less than 1%. It is, therefore, convenient to use either correlation to simulate the performance of transcritical CO₂ expander cycle.

Keywords transcritical CO₂ cycle optimal heat rejection pressure simulation expander

Corresponding Author(s): YANG Junlan,Email:yjlfg@163.com

Issue Date: 05 December 2010

Cite this article:

Junlan YANG,Yitai MA,Minxia LI, et al. Simulation of the optimal heat rejection pressure for transcritical CO₂ expander cycle[J]. Front Energ Power Eng Chin, 2010, 4(4): 522-526.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-010-0027-8
https://academic.hep.com.cn/fie/EN/Y2010/V4/I4/522

Fig.1 Schematic diagram of the transcritical CO cycle with an expander

Fig.2 - diagram of the transcritical CO cycles

Fig.3 Optimal heat rejection pressures versus evaporation temperature

Fig.4 Optimal heat rejection pressures versus outlet temperature of gas cooler

Fig.5 Optimal heat rejection pressure versus the expander efficiency

Fig.6 Optimal heat rejection pressure versus the compressor efficiency

Fig.7 The versus at various evaporation temperature

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