Effect of Adding Heat Exchanger on the Refrigeration System Performance

Maytham Neamah Jasim; Yaser Alaiwi

doi:10.24237/djes.2023.16201

Authors

Maytham Neamah Jasim
neamahmaytham@gmail.com
Department of Mechanical Engineering, Altinbaş University, Istanbul 34217, Turkey
Yaser Alaiwi Department of Mechanical Engineering, Altinbaş University, Istanbul 34217, Turkey

Keywords:

Shell and tube, Coefficient of performance (COP), Engineering Equation Solver (EES), Condenser, Subcooling

Abstract

Internal or liquid-suction heat exchangers are used with the main goal of ensuring the entry of refrigerant in the liquid phase to the expansion device. The greatest COP gain is primarily determined by the thermodynamic parameters linked to the relative increase in refrigerating effect. Large latent heat of vaporisation refrigerants often does not gain as much from condenser subcooling in support of a cooling system. Computational fluid dynamics (CFD) is used to study the effects of the turbulence model, which requires the solution of two transport equations. A technique was developed to study the thermal effect on the heat exchange process between two fluids. To observe the temperature effect on 17 tubes, the diameter was altered twice, first to 6 mm and then to 4 mm. The flow procedure transpired in one direction, and the tube housing the tubes had a diameter of 50 mm. In the best-case scenario, the pipe diameter is 4 mm, and the heat exchanger is 300 mm in length. The results indicate an improved enthalpy of 423.2 h [KJ/M] in the simulated cases. The length of the heat exchanger greatly affects the values of the exit temperatures and the temperature difference. For a length of 225 mm, the temperature reached 15.73 °C, and for 300 mm, it reached 13.847 °C. The significant reduction in temperatures increases the coefficient in the refrigeration cycle. A high coefficient of cooling in the heat exchanger appears when the length is 300 mm compared with other lengths.

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