Thermodynamic Analysis of the Air-Cooled Transcritical Rankine Cycle Using CO 2 /R161 Mixture Based on Natural Draft Dry Cooling Towers

Yingjie Zhou, Junrong Tang, Cheng Zhang and Qibin Li
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Yingjie Zhou: College of Computer Science, Sichuan University, Chengdu 610065, China
Junrong Tang: College of Aerospace Engineering, Chongqing University, Chongqing 400044, China,
Cheng Zhang: CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, NPIC, Chengdu 610213, China
Qibin Li: Key Laboratory of Low-grade Energy Utilization Technologies & Systems, Ministry of Education, College of Energy and Power Engineering, Chongqing University, Chongqing 400044, China

Energies, 2019, vol. 12, issue 17, 1-17

Abstract: Heat rejection in the hot-arid area is of concern to power cycles, especially for the transcritical Rankine cycle using CO 2 as the working fluid in harvesting the low-grade energy. Usually, water is employed as the cooling substance in Rankine cycles. In this paper, the transcritical Rankine cycle with CO 2 /R161 mixture and dry air cooling systems had been proposed to be used in arid areas with water shortage. A design and rating model for mixture-air cooling process were developed based on small-scale natural draft dry cooling towers. The influence of key parameters on the system’s thermodynamic performance was tested. The results suggested that the thermal efficiency of the proposed system was decreased with the increases in the turbine inlet pressure and the ambient temperature, with the given thermal power as the heat source. Additionally, the cooling performance of natural draft dry cooling tower was found to be affected by the ambient temperature and the turbine exhaust temperature.

Keywords: transcritical Rankine cycle; CO 2 mixture; R161; cooling tower; waste heat recovery (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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