Author : S. Saravanana

This project demonstrates the working of ultimate chilling system which can be used in pharmeuacticals industry, to preserve medicines, R&D centres etc. Ultimate chilling system is a three stage cascade refrigeration system. The main purpose of this system is to produce temperature less than -60˚C and to maintain that temperature constant in conditioned space. This system has one main system and two sub systems. Each system has different refrigerant (R134A, R404A, R23).Main system as R23 as refrigerant. Sub system 1as R134A as refrigerant, sub system 2 as R404A as refrigerant .Sub system 1 evaporator act as a condenser for sub system 2,then sub system 2 evaporator act as a condenser for main system. By using these three systems temperature less than -60˚C can be achieved. Then coefficient of performance calculation done .

Keywords: maintain temperature at -60˚C, by two subsystems and one main system, R23, R404A, R134A three stage cascade refrigeration system

Article published in International Conference on Advances in Mechanical Sciences 2014, Special Issue-2 (Feb 2014)