Thermal energy storage (TES) is an innovative technology that can help mitigate environmental problems and make energy consumption in air conditioning systems more efficient. TES also helps to decouple the production and use of cooling. In this work, a mathematical model was used to obtain the thermal loads of the environment based on Brazilian standards and to simulate the operation of an air conditioning system integrated with TES. A refrigeration system capable of providing cooling capacity for the selected environment was used. It simulated the operation of refrigeration systems to evaluate the coefficient of performance of the refrigeration cycle and the refrigeration system, including the TES, for the city of Teresina, in the northeast region of Brazil. On each day, the efficiency of the air-cooled chiller coupled with a TES that used paraffin with phase change material was verified. Based on the data obtained from the mathematical model, the reduction in energy consumption achieved by coupling TES with the air conditioning system varied between 10.6% and 1.3%.

Replacing electric water heaters with heat pumps significantly lowers energy consumption and greenhouse gas emissions. Among the refrigerants considered, carbon dioxide (CO₂ or R744) has attracted considerable attention from refrigeration specialists. However, the high operating pressures of R744 can exceed safe limits when heat pump components are exposed to intense solar radiation and elevated temperatures. This study develops a mathematical model for the evaporator of a Direct Expansion Solar-Assisted Heat Pump (DX-SAHP) to analyze pressure behavior when the system is inactive but subjected to solar radiation. The model also examines how these pressures affect component integrity, accounting for the mass of R744 trapped inside the evaporator. Meteorological data from Brazil’s four regions, provided by INMET, were used in the simulations. Simulations were conducted using information from five different cities and up to 10 years of climate data. Results show that for a refrigerant mass fraction of 12%, the maximum pressure reached approximately 122 bar, compared to the manufacturer’s specified limit of 132 bar for the evaporator tubes.

Anais do Congresso Internacional de Engenharia Mecânica e Industrial (2764-4294) - Análise Térmica Do Evaporador Solar De Uma Bomba De Calor De Expansão Direta

Anais do Congresso Internacional de Engenharia Mecânica e Industrial (2764-4294) - Análise Transiente Da Operação De Uma Válvula De Expansão Termostática Em Uma Máquina De Refrigeração Ar-Ar

Anais do Congresso Internacional de Engenharia Mecânica e Industrial (2764-4294) - Análise Térmica Do Resfriador De Gás De Uma Bomba De Calor De Expansão Direta

Anais do Congresso Internacional de Engenharia Mecânica e Industrial (2764-4294) - Análise Térmica De Bombas De Calor Com Expansão Direta