Refrigeration systems have been widely used to maintain reduced temperature for specific applications. The work deals with modifying the existing design by installing fins in evaporator which acts as the key factor in refrigeration system. A study has been carried out with HC and R134a refrigerants which are commonly used in typical refrigeration system. Comparison studies has been made on the cooling capacity of the two refrigerants in hourly basis, so as to check the compatibility of the alternative refrigerant in working conditions with reduced global warming effect and power consumption. This can be achieved by increasing the heat transfer rate.
Original scientific paper https://doi.org/10.2298/TSCI190709441JIn-cylinder gas motion is the essential parameter that enhances fuel-air mixing and increases the combustion rate and governs the performance and emission of the engine. It also has significant impact on heat transfer. Angling the intake port into various angles is the one of the method to enhance swirl motion inside the combustion chamber. In this project, direct port is converted into helical port to analyze the air motion inside the engine cylinder. In order to analyze the effect of helical port design the various flow parameters such as swirl ratio, flow coefficient, and turbulent kinetic energy are calculated. By angling the intake port, swirl generation during suction stroke is comparatively larger than direct port. A commercial CFD software STAR-CCM is used to analyze the in-cylinder air motion.
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