Performance analysis of a zeotropicmixture (R290/CO2) for trans-critical power cycle

doi:10.1016/j.cjche.2014.04.003

›› 2015, Vol. 23 ›› Issue (3): 572-577.DOI: 10.1016/j.cjche.2014.04.003

• Chemical Engineering Thermodynamics • Previous Articles Next Articles

Performance analysis of a zeotropicmixture (R290/CO₂) for trans-critical power cycle

Lisheng Pan¹, XiaolinWei¹, Weixiu Shi²

1 State Key Laboratory of High-Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China

Received:2014-02-11 Revised:2014-04-30 Online:2015-04-03 Published:2015-03-28
Supported by:
Project 51306198 supported by the National Natural Science Foundation of China.

Performance analysis of a zeotropicmixture (R290/CO₂) for trans-critical power cycle

Lisheng Pan¹, XiaolinWei¹, Weixiu Shi²

1 State Key Laboratory of High-Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China

通讯作者: Lisheng Pan
基金资助:
Project 51306198 supported by the National Natural Science Foundation of China.

Abstract

Abstract: Lowcritical temperature limits the application of CO₂ trans-critical power cycle. The binary mixture of R290/CO₂ has higher critical temperature. Using mixture fluid may solve the problem that subcritical CO₂ is hardly condensed by conventional cooling water. In this article, theoretical analysis is executed to study the performance of the zeotropic mixture for trans-critical power cycle using low-grade liquid heat source with temperature of 200℃. The results indicated that the problem that CO₂ can't be condensed in power cycle by conventional coolingwater can be solved bymixing R290 to CO₂. Variation trend of outlet temperature of thermal oil in supercritical heaterwith heating pressure is determined by the composition of the mixture fluid. Gliding temperature causes the maximum outlet temperature of cooling water with the increase of mass fraction of R290. There are themaximumvalues for cycle thermal efficiency and net power outputwith the increase of supercritical heating pressure.

Key words: CO₂, R290, Zeotropic mixture, Low-grade heat energy, Trans-critical power cycle

摘要： Lowcritical temperature limits the application of CO₂ trans-critical power cycle. The binary mixture of R290/CO₂ has higher critical temperature. Using mixture fluid may solve the problem that subcritical CO₂ is hardly condensed by conventional cooling water. In this article, theoretical analysis is executed to study the performance of the zeotropic mixture for trans-critical power cycle using low-grade liquid heat source with temperature of 200℃. The results indicated that the problem that CO₂ can't be condensed in power cycle by conventional coolingwater can be solved bymixing R290 to CO₂. Variation trend of outlet temperature of thermal oil in supercritical heaterwith heating pressure is determined by the composition of the mixture fluid. Gliding temperature causes the maximum outlet temperature of cooling water with the increase of mass fraction of R290. There are themaximumvalues for cycle thermal efficiency and net power outputwith the increase of supercritical heating pressure.

关键词: CO₂, R290, Zeotropic mixture, Low-grade heat energy, Trans-critical power cycle

Lisheng Pan, XiaolinWei, Weixiu Shi. Performance analysis of a zeotropicmixture (R290/CO₂) for trans-critical power cycle[J]. , 2015, 23(3): 572-577.

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Performance analysis of a zeotropicmixture (R290/CO₂) for trans-critical power cycle

Performance analysis of a zeotropicmixture (R290/CO₂) for trans-critical power cycle

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