Influence of Evaporator Inlet Air Velocity on the Thermodynamic Properties in an Automotive Air Conditioner
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Abstract
An experimental work is carried out on automobile air conditioning test setup. Pure refrigerant R134a is used initially and its thermodynamic characteristics were analysed and then it is compared with the R134a CuO nanorefrigerant. The experiment is conducted by heating the cabin to a temperature of 50ºC by using electric heaters. Temperature uniformity inside the cabin is maintained and by varying the evaporator airflow rates at various compressor speeds. The difference in suction pressure between low, medium and high speed is very small. The discharge temperature of R134a at low speed Td L is 72ºC at 850 rpm, the discharge temperature at the same speed for nanoparticles is 63.7ºC and 58.3ºC. The coefficient of performance of nanorefrigerant is increased by 17% at low speed and 20% at medium speed and 34% at high speed at 1600 rpm when compared with pure R134a.
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