Abstract
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.
Highlights
To improve the energy efficiency in the industrial world, heat recovery technologies employing standalone and combined cycle configurations have been advanced and improved continuously
Before further scrutinizing the refrigeration cycle working fluid, along with a lower pressure ratio across the compressor or lower compressor work, the coefficient of performance has been evaluated for each set of temperatures and working fluids
A combined power and refrigeration system consisting of Organic Rankine cycles (ORC) and vapor compression refrigeration cycle (VCC) has been analyzed for the refrigeration application
Summary
To improve the energy efficiency in the industrial world, heat recovery technologies employing standalone and combined cycle configurations have been advanced and improved continuously. Because of irreversibility losses in the practical application of combined power and refrigeration cycles, it is not possible to all the available waste heat energy into useful work. The direct coupling of the ORC-turbine and VCC-compressor contributes to reduced mechanical energy losses [10] This combined power and refrigeration system is an efficient way to fulfill the thermo-mechanically activated refrigeration system. The selection of working fluid for a given heat source temperature range in ORC requires extensive analysis With this background, the present exercise is taken with the specific objective of carrying out system analysis for overall system improvement. Since the normal boiling point of most of the organic working fluids was lesser than that of water, the studied system can be integrated with low temperature heat sources such as waste heat from fishing boats and industrial processes, biomass combustion, geothermal, and solar. Combining power generation and refrigeration improves the system coefficient of performance with the proper selection of working fluids
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