Abstract:

In this study, the use of the R152a cooling fluid in a car heat pump system has been tested at different air temperatures and speeds. In experiments, by changing the speed and temperatures of the air flow into the internal and external units (drugs and evaporators), the performance of the system in the warming state was determined. The R134a cooling fluid, which is widely used in air conditioning and heat pump systems, is compared with the working conditions of the R152a. As a result, the heating capacity of the system operated with the R152a cooling fluid was determined to be higher than the R134a. With the increase in the air flow in the entrance of the internal unit, the heating capacity values of the R152a have been shown to decrease. In addition, it has been determined that the performance effect of air flow conditions is higher than the temperature conditions. R152a may be a suitable alternative refrigerator in the car air conditioning systems when necessary improvements are made.

Keywords:

Abstract:

In this study, the use of R152a in an automobile heat pump system was experimentally investigated under different air temperatures and air flow rates. System performance was determined by changing the air flow rates and temperatures entering the indoor and outdoor units. Operating conditions of R134a and R152a, which used in air conditioning and heat pump systems, are compared. It was determined that the heating capacity of the R152a was higher than that of R134a.  It was also seen that the heating capacity of R152a increased with the decreased of the air flow rates at the indoor unit.  Besides, it was observed that the effect of air flow conditions on the performance parameters was higher than environmental conditions. Finally, it was determined that R152a can be used as an alternative refrigerant in automotive air conditioning systems when the necessary improvements made.