Análise termoeconômica comparativa de sistemas de refrigeração para shopping a partir de compressão de vapor e resfriamento evaporativo

Abstract

In the search for reducing electricity consumption, it is necessary to analyze alternative systems for cooling shopping malls that require less electricity consumption. The purpose of this work was to present a comparative thermoeconomic analysis between two thermal control systems for shopping malls in the city of Londrina/PR: vapor compression refrigeration (aircooled chiller) and vapor compression refrigeration with evaporative cooling (watercooled chiller and cooling tower). The EES program was used to build the two refrigeration models, based on the classical literature on the subject. Mass and energy balances were applied to each of the system components, using the 1st Law of Thermodynamics, to perform the thermodynamic analysis. The vapor compression refrigeration system with evaporative cooling (watercooled chiller and cooling tower) presented a compressor power consumption 27,25% lower compared to the vapor compression refrigeration system (watercooled chiller), thus obtaining na anual energy saving of R$222.469,69. With the results of the difference in annual energy consumption, the difference in the acquisition and annual maintenance between the two refrigeration systems, the economic analysis was carried out, through economic indicators, obtaining a discounted Payback of 8 years, 1 month and 5 days, a NPV of R$1.049.284,94 and na IRR of 14,219%, where the results showed that the investment is viable.