Fossil resources are largely used for energy supply. This situation causes
environ?mental pollution. In recent years, studies in the field of more
environmentally friend?ly and sustainable energy conversion technologies
have increased. In this context, organic Rankine cycle (ORC) technology is
combined with RES. In this study, combined ORC and vapor compression cycle
(VCC) were investigated. The electricity produced in the combined ORC-VCC
system was used both in the compressor of the VCC system and in the plant.
The main factor affecting the efficiency of the combined ORC-VCC system is
the refrigerant. Therefore, it is necessary to examine the selection of the
most suitable refrigerant for an ORC-VCC based system. Fifteen different
refrigerants were optimized with the enginering equation solver program, and
energy and exergy analyzes of the systems were made separately. According to
the results, the best energy efficiency and COP values among the
refrigerants was found to be R40 (?ORC = 0.1206) for the ORC system and R113
(COP = 4.405) for the VCC system. For all system components in the VCC, the
most exergy destruction occurs in the evaporator, followed by the
compressor, condenser, and throttle, respectively. In ORC, the most exergy
destruction is in the evaporator, followed by the condenser, tube and pump,
respectively. The total efficiency was found to be (? = 0.53) for the
combined ORC-VCC system. The total exergetic efficiency was found to be
(?glob = 0.26) for the combined ORC-VCC system.