Thermodynamic analysis of simple and modified organic Rankine cycle and vapor compression refrigeration ( ORC–VCR ) systems

2020 ◽  
Author(s):  
Ashwni ◽  
Ahmad Faizan Sherwani ◽  
Deepak Tiwari
Keyword(s):  
Thermodynamic Analysis ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Vapor Compression ◽  
Vapor Compression Refrigeration

scholarly journals Energy and Exergy Analysis of Combined Organic Rankine Cycle-Single and Dual Evaporator Vapor Compression Refrigeration Cycle

2019 ◽  
Vol 9 (23) ◽  
pp. 5028 ◽  
Author(s):  
Pektezel ◽  
Acar
Keyword(s):  
Exergy Analysis ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Working Fluid ◽  
Refrigeration Cycle ◽  
Vapor Compression ◽  
Exergy Destruction ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis ◽  
Vapor Compression Refrigeration

This paper presents energy and exergy analysis of two vapor compression refrigeration cycles powered by organic Rankine cycle. Refrigeration cycle of combined system was designed with single and dual evaporators. R134a, R1234ze(E), R227ea, and R600a fluids were used as working fluids in combined systems. Influences of different parameters such as evaporator, condenser, boiler temperatures, and turbine and compressor isentropic efficiencies on COPsys and ƞex,sys were analyzed. Second law efficiency, degree of thermodynamic perfection, exergy destruction rate, and exergy destruction ratio were detected for each component in systems. R600a was determined as the most efficient working fluid for proposed systems. Both COPsys and ƞex,sys of combined ORC-single evaporator VCR cycle was detected to be higher than the system with dual evaporator.

scholarly journals Thermodynamic Study of a Combined Power and Refrigeration System for Low-Grade Heat Energy Source

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 410
Author(s):  
Saboora Khatoon ◽  
Nasser Mohammed A. Almefreji ◽  
Man-Hoe Kim
Keyword(s):  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Combined Cycle ◽  
Performance Criteria ◽  
Low Grade ◽  
Refrigeration Cycle ◽  
Vapor Compression ◽  
Working Fluids ◽  
Vapor Compression Refrigeration Cycle ◽  
Vapor Compression Refrigeration

This study focuses on the thermal performance analysis of an organic Rankine cycle powered vapor compression refrigeration cycle for a set of working fluids for each cycle, also known as a dual fluid system. Both cycles are coupled using a common shaft to maintain a constant transmission ratio of one. Eight working fluids have been studied for the vapor compression refrigeration cycle, and a total of sixty-four combinations of working fluids have been analyzed for the dual fluid combined cycle system. The analysis has been performed to achieve a temperature of −16 °C for a set of condenser temperatures 34 °C, 36 °C, 38 °C, and 40 °C. For the desired temperature in the refrigeration cycle, the required work input, mass flow rate, and heat input for the organic Rankine cycle were determined systematically. Based on the manifestation of performance criteria, three working fluids (R123, R134a, and R245fa) were chosen for the refrigeration cycle and two (Propane and R245fa) were picked for the organic Rankine cycle. Further, a combination of R123 in the refrigeration cycle with propane in the Rankine cycle was scrutinized for their highest efficiency value of 16.48% with the corresponding highest coefficient of performance value of 2.85 at 40 °C.

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