Effect of Variation in Evaporator Inlet Air Temperature on Coefficient of Performance in an Automotive Air Conditioning System
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Abstract
Because of its superior thermal properties and multiple prospective uses, nanofluids had sparked the interest of investigators. Addition of nanoparticles to refrigerants and lubricants improves thermal characteristics and lowers power wastage. In this paper R134a refrigerant is added with nanoparticle CuO in the concentration of 0.1%v to 0.5%v and its performance is evaluated. The suction pressure of R134a at 32C is 9% higher than R134a+0.1nm and 17% higher than R13a+0.5nm.The discharge temperature of R134a is more than nano refrigerant. Due to this, the power consumption of R134a is more than nano refrigerant. By adding nanoparticles to refrigerant, the power consumption at 28C is 23% less than R134a which shows nanoparticles works normally when mixed with R134a. Due to high thermal conductivity of nanoparticles, the coefficient of performance of R134a is 35% less than R134a+0.1nm and 41% less than R134a+0.5nm.
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