Estudo sobre o coeficiente de desempenho (COP) de um sistema de refrigeração utilizando dois fluidos refrigerantes distintos

Abstract

Small cooling systems may use different refrigerants. This study was aimed to compare the performance of a cooling system using two different refrigerants R22 and R404a. With an existing countertop and equipped with selector switches that combine: reciprocating compressor and capillary tube; reciprocating compressor and expansion valve; rotary compressor and capillary tube and an expansion valve, have been eight different tests. At the exit of each component were installed digital pressure gauges and thermometers for the purpose of calculating the system performance for different possible combinations. Analyzing the test results using the fluid R22, it was found that the cooling system comprises the rotary compressor and the capillary tube, test 02, performed best 89.84% compared to the Carnot cycle. Using the reciprocating compressor along with the expansion valve, test 07, there was obtained a performance 79,80% compared to the Carnot cycle.