Abstract:

In this study, the mathematical modeling of the winged tube compact heat exchanger, in which different fluids are used as cooling, was made as an evaporator. In the heat exchanger used as an evaporator ( surface type 8.03/8T and CF-7.0-5/8J), a model that can predict cooling capacity using a natural (R290) and three synthetic (R410A, R134a, R404A) cooling fluid in variable working parameters (mass debt, temperature, pressure) has been developed. The impact on the environment of selected cooling fluids (hydro-floro carbon group R134a, R404A, R410A and hydrocarbon group R290) was also studied by comparing the global warming effect (GWP) values.  The mathematical model is developed using the EES (Engineering Equation Solver) software. The model developed in the same cooling capacity different cooling fluids and surfaces are used for cases where the evaporators are in the evaporation and angry gas area - the air temperature, the heat transfer rate, the total heat transfer rate and the heat flow can be predicted. In variable mass flow values (50-500 kg/m2.s), the highest heat transfer rate in the evaporation area is calculated for the natural liquid R290. Compared to all the fluids, R290 was found to have a lower mass flow value than other synthetic fluids. Having taken into account the results obtained and the environmental effects of cooling fluids, it has been determined that the natural fluid R290 can be preferred in cooling systems.

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