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Abstract
In this paper, an experimental analysis of conventional air-cooled and microchannel condensers in automotive vapor compression refrigeration cycle concerning heat transfer coefficient and energy using R134a as a refrigerant was presented. The performance of two condensers and cycles tested regarding ambient temperature which it was varied from 40oC to 65oC, while the indoor temperature and load have been set to be 23oC and 2200 W respectively. Results showed that the microchannel condenser has 224 % and 77 % higher refrigerant side and air side heat transfer coefficient respectively than the coefficients of the conventional condenser. Thus, the COP, in case of using the microchannel condenser, was found to be 20 % higher than that of the conventional cycle. Also, the microchannel condenser has a 50 % smaller volume than the conventional. Therefore, it provides more space in the car engine container occupied with other components.
Highlights
One of the basic problems in the refrigeration cycle, the one containing an aircooled condenser, is the high condensing temperature
The microchannel condenser works with 787 kg/m2s mass flux, while the conventional baseline condenser works with 200 kg/m2s
Since the refrigerant side heat transfer coefficient has a direct proportion with the mass flux, it will be higher throughout the microchannel condenser than the conventional
Summary
One of the basic problems in the refrigeration cycle, the one containing an aircooled condenser, is the high condensing temperature. The condensing temperature may rise because of the increased temperature of the environment, especially in hot countries like Iraq. The vapor compression refrigeration cycle (VCRC) will suffer from a reduction in performance when the ambient temperature increases. With rising temperature, the compressor discharge pressure increases due to the reduction in heat sink ability in receiving heat. The increased discharge pressure results in high compressor work, low refrigeration effect, and low coefficient of performance. A new solution may be the key to design a very effective condenser, even at high ambient temperature, is by using a new type of a very compact heat exchanger. What is commonly known as the microchannels heat exchangers
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