Analysis of energetic and exergetic performance according to the evaporation temperature of a vapor compression chiller
DOI:
https://doi.org/10.47456/bjpe.v10i3.44651Palavras-chave:
Chiller screw compressor, Energy efficiency, Exergy efficiency, Evaporation temperatureResumo
This article presents an energy and exergy efficiency analysis of a large-scale chilled water refrigeration system, a chiller, integrated into a chilled water plant designed to supply the thermal load required for air conditioning in a large shopping mall located in the capital of the state of Paraíba, Brazil. The studied chiller uses a screw-type compressor, which operates with an electric motor to increase the pressure in one phase of the thermodynamic cycle, resulting in significant energy consumption, especially in continuous operations and under high load. The study focuses on reducing electrical energy consumption by evaluating and identifying improvements in the system's operation, based on energy and exergy behavior. To achieve this goal, numerical simulations were performed using the Engineering Equation Solver (EES) software, which allowed the system's operation to be represented and optimized. Additionally, the article presents detailed data on the refrigeration cycle of the studied chiller, essential for understanding the equipment's operation. The results indicate that the evaporator had the highest exergy loss, but this could be reduced by increasing the evaporation temperature, improving the overall efficiency of the refrigeration unit and reducing electrical energy consumption.
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