부산대학교 도서관

In hot and dry weather, compression cooling systems operated by environmentally friendly gas are extensively employed. The air temperature in the study area exceeds 50 degrees Celsius and the relative humidity is less than 20%. The downsides of this system are its inability to operate at elevated pressures and temperatures, its high energy consumption, and it's a low coefficients of performance (COP) in comparison to conventional cooling systems that do not utilize eco-friendly gases. To address this issue and determine an appropriate solution, an experimental investigation was directed to optimize the performance of cooling systems using an air conditioning system with a cooling capacity of (7.5) kW and a working refrigerant fluid of (R-410a). It is a direct evaporative cooling (DEC) system that uses a wet pad to cool the air before it enters the cooling system's condenser. The water evaporates and extracts the latent heat of evaporation from the wet pad, lowering the temperature of the air by about 12°C before it enters the system's condenser. This decrease in air temperature enhances the compressive refrigeration system's actual and theoretical (COP) by (27 and 33 percent, respectively). Additionally, approximately a 22% reduction in electric current use. In this research, the amount of condensed water was calculated with a volume of more than 25 liters per day, and this quantity depends on the air temperature as well as the relative humidity, where the percentage of water consumption for the wet pad was about 75 liters per working day. The other advantage the quantity of condensed water will be used to wet the pad, as it constitutes 30% of the water consumed. Therefore, the suggested method, with using wet pad, significantly improves the compression cooling system's performance systems. [ABSTRACT FROM AUTHOR]