Abstract
In this study, the experimental performance of the use of R1234yf refrigerant al-ternative to R134a refrigerant in an automobile air conditioning system with var-iable capacity compressor was investigated. The automobile air conditioner con-sists of a variable capacity compressor, evaporator, condenser, liquid tank and expansion element. The experimental air conditioner is equipped with computer-aided control systems to obtain the desired experimental conditions and data col-lection systems for measuring and collecting experimental data. Tests were per-formed at different compressor speeds and different condenser and evaporator inlet air flow temperatures. Energy analysis was applied to the obtained experi-mental data and the results were presented in comparative graphs. In the results, it was seen that while the cooling effect coefficient and evaporator outlet air flow generally decreased in both refrigerants with the increase of the compressor speed, the mass flow rate of the refrigerants, the compressor outlet temperature, the heat discharged from the condenser, the cooling capacity and the compressor power increased. In cases where the evaporatör inlet airflow temperature is low, it has been observed that the change in the data is very small with the increase of the compressor speed with the effect of the capacity control system
Highlights
The use of energy in air-conditioning systems and the costs spent are important
It has been observed that the mass flow rates of R134a and R1234yf refrigerants increase as the compressor speed increases
For low airflow inlet temperatures, it has been observed that R1234yf refrigerant uses a mass flow rate of around 75% lower than R134a refrigerant
Summary
The use of energy in air-conditioning systems and the costs spent are important. Developments in this area play an important role in the future planning of the food, beverage, chemical and automotive industries. Since the working pressure value in air conditioning systems is very high, it works with high compressor power This causes a decrease in the coefficient of performance (COP) together with leakage problems in the air conditioning system. Yuan et al [11] in their study, used heat pump application in the air conditioning systems of electric cars, which are seen as new generation cars, and stated that the use of R152a and R1234yf refrigerants as refrigerants instead of R134a would reduce their emissions by 1023% and 3-18%, respectively. Chen et al [12] examined the performance values of R152a and R1234yf refrigerants, which they stated to have similar thermodynamic properties to R134a refrigerant They stated in the study that the working pressure and temperature of R1234yf were similar to R134a, but R1234yf had a deterioration in cooling capacity and coefficient of performance (COP) of 11% and 16%, respectively.
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