Thermodynamic Analysis Of Some Refrigerants Used In Refrigerator and Industrial Refrigeration

Abstract

Exergy analysis is a powerful tool in the design, optimization and performance evaluation of energy systems. In this paper, the author analyzes the thermodynamics of single-stage refrigeration systems that compress the refrigerant R22, R717, R404A, R507A, R1234yf, R134a, R600a by parameters: Compressor ejector temperature T2 [K], volume specific refrigeration capacity qv [kJ/m³] , cooling coefficient COP, exergy efficiency COPex, cycle completion η[%], exergy loss Ex_d,total [kW] at condensing temperature T_k = 315[K], evaporating temperature T₀ = 268[K], 265[K], 258[K], 253[K], 248[K], 243[K], 238[K]. Thereby, the author found that in the negative temperature refrigeration systems with small capacity such as refrigerators and ice cream cabinets, the refrigerant R600a results in cooling coefficient COP, exergy efficiency, specific volume refrigeration capacity, cycle completion is greater than R134a and is the highest among refrigerants in use today. In industrial refrigeration systems, refrigerant R22 has a lower end temperature of compression than NH₃, so it may not be necessary to have an additional compressor cooling system, the COP is almost the same, loss exergy NH₃ is too large even though the exergy performance is almost the same. In terms of environmental impact, NH₃ refrigerant is still the preferred choice compared to R22.