Study the Effect of Adding Heat Exchanger on the Refrigeration System Performance

Abstract

Internal, or liquid-suction, heat exchangers are used with the primary 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 vaporization 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 happened in one direction, and the tube that contains the tubes had a diameter of 50 mm. The best-case scenario is the case where the pipe diameter is 4 mm and the heat exchanger are 300 mm in length. Through the results, the enthalpy was improved in the simulated cases to 423.2 h [KJ/M]. 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 helps increase the coefficient in the refrigeration cycle. A high coefficient of cooling in the heat exchanger appears when the length is 300 mm compared to other lengths.

Keywords

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