Simulação do ciclo de refrigeração com amônia (R717)

Abstract

Refrigeration is the process by which thermal energy is transferred from a low-temperature environment to a high-temperature environment through devices operating in refrigeration cycles. The use of refrigeration is diverse, and it is applied in numerous industries and businesses for both thermal comfort and food preservation. The objective of this study is to analyze the influence of operational parameters such as condensing temperature; evaporating temperature; superheating temperature; subcooling temperature; pressure drop in the condenser; pressure drop in the evaporator; pressure drop in the suction lines, liquid line and compressor discharge lines; and the isentropic efficiency in the coefficient of performance of a vapor compression refrigeration cycle operating with ammonia, R717, using CoolPack software. The simulations using CoolPack are performed from a reference cycle varying the operational parameters according to equal and specific increments for each parameter. With the simulations in the software, it was possible to observe that the evaporation temperature, condensing temperature and the isentropic efficiency of the compressor are capable of significantly influencing the coefficient of performance (COP), which can generate an increase of up to 13% of the COP and causing a decrease in the work performed by the compressor of up to 43,112 𝑘𝐽/𝑘𝑔.