Performance Analysis of Multi-Pressure Refrigeration System Using R12, R134 & R22 Refrigerant

https://doi.org/10.46610/JoTES.2024.v09i01.003

Abstract

Three evaporators having their capillary for expansion in vapour compression refrigeration systems have been considered for experimentation where a single compressor having a single condenser is used. A hand-operated valve is used for controlling the mass flow rate. Refrigerant R-12, R134 and R-22 have been used to check the performance of Multiple VC systems for different conditions, where it was found that the performance of R22 is much better than R12 and R134. At present R22 is not used because of its chemical composition which can create problems for the ozone layer in the long term but replacement of R22 is available today with the R400 series. By using this type of system one evaporator can be used as a deep freezer, one evaporator as a frost-free and the other can be used as a normal refrigerator. A compressor with a capacity of 1.0 Tonnes is used. The heavy condenser is used which is generally used in air conditioning systems. The cooling capacity of each evaporator is controlled by an input valve provided, while the compressor and condenser use single-input, single-output point. This appliance has three compartments each having a common access door. The first evaporator is for the first compartment operating at the first pressure level, the second evaporator is for the second compartment operating at the second pressure level and the third evaporator is for the third compartment operating at the third pressure level.  By changing the mass flow rate of each evaporator, we can produce different temperatures in each evaporator.