Premium
Incorporation of an organic Rankine cycle in a transcritical booster CO 2 refrigeration system
Author(s) -
Bellos Evangelos,
Tzivanidis Christos
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.5192
Subject(s) - organic rankine cycle , gas compressor , refrigeration , booster (rocketry) , working fluid , process engineering , electricity , transcritical cycle , environmental science , coefficient of performance , degree rankine , waste management , waste heat , thermodynamics , engineering , mechanical engineering , heat exchanger , electrical engineering , refrigerant , physics , aerospace engineering
Summary The objective of this work is the investigation of an alternative refrigeration system, which combines a supermarket CO 2 booster system with an organic Rankine cycle. The waste heat after the high‐pressure compressor is used in order to feed the organic Rankine cycle for electricity production. The working fluid in the organic Rankine cycle is selected to be the octamethyltrisiloxane (MDM), which has a low global warming potential, and so all the used working fluids in the system are environmentally friendly. The system is studied in the transcritical region for ambient temperatures from 27°C to 40°C. In every case, the system is optimized in order to minimize the overall electricity demand. According to the final results, the system coefficient of performance (COP) can be enhanced from 4.83% to 7.60%, while the electricity consumption can be reduced from 4.60% to 7.03% compared with the conventional booster system. Higher enhancements are found in cases with higher ambient temperatures. Furthermore, a preliminary financial study indicates that the examined idea is viable with the simple payback period to be 5.45 years. The present study is conducted by using a homemade model written in Engineering Equation Solver.