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Experimental investigation of solar‐assisted transcritical CO 2 Rankine cycle for summer and winter conditions from exergetic point of view
Author(s) -
Yamaguchi Hiroshi,
Yamasaki Haruhiko,
Kizilkan Onder
Publication year - 2020
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4997
Subject(s) - environmental science , exergy , degree rankine , condenser (optics) , organic rankine cycle , rankine cycle , exergy efficiency , solar energy , meteorology , heat exchanger , environmental engineering , waste management , engineering , process engineering , waste heat , mechanical engineering , geography , thermodynamics , power (physics) , physics , light source , electrical engineering , optics
Summary This study deals with energy and exergy analysis of the experimental solar‐assisted Rankine cycle working with an environmentally friendly working fluid transcritical CO 2 . The experimental system consists of evacuated solar collectors, a heat recovery system, condenser, a pump, and an expansion valve to simulate the realistic turbine operation. The system was designed for electricity production and the heat supply for various applications. The experiments were made funder typical winter and summer days to evaluate seasonal system performance in Kyoto, Japan. According to the obtained results, the turbine capacity was calculated as 0.118 kW and 0.177 kW for winter and summer seasons. From the exergetic point of view, solar collectors were found to be the major contributor to the total exergy destruction with 96.32% for summer and 93.58% for the winter season. Therefore, the efforts should be focused on the collectors. Thus, any attempt for improving the system performance should be focused on solar collectors first. Furthermore, the exergetic efficiency of the overall system was calculated as 7.63% for the winter season and 4.08% for the summer season. As a result, the utilization of CO 2 in the energy conversion cycle can be sustainably developed and extended by providing a glimpse into the carbon‐free clean energy future.