A refrigerant is a substance or mixture, usually a fluid, used in a heat pump and refrigeration cycle.In most cycles it undergoes phase transitions from a liquid to a gas and back again.Many working fluids have been used for such purposes. R-401A is a HCFC zeotropic blend of R-22, R-152a, and R-124. 2  It is designed as a replacement for R-12. 3  R-404A is a HFC nearly azeotropic  blend of 52 wt.% R-143a, 44 wt.% R-125, and 4 wt.% R-134a. 4  It is designed as a replacement of R-22 and R-502 CFC.
The temperature of the ice will continue to decrease until it reaches the same temperature as the outside air which is 20 F. Liquid water has more energy than frozen water. When water freezes it gives up some of the water's energy. This energy that is given up is the latent heat of freezing.
1 heat released by the water to cool it from 25.0Â°C to 1.0 Â°C (call it q4). 2  Set up an energy conservation equation. 3  If all significant transfers of energy were listed in the previous step, the total energy absorbed should be balanced by the total energy released or you'll violate the law of conservation of energy. heat absorbed by the ice to warm it to 0Â°C (call it q1). 2  heat absorbed by the ice to melt it at 0Â°C (call it q2). 3  heat absorbed by the melted ice to warm it from 0.0 to 1.0 Â°C (call it q3). 4  heat released by the water to cool it from 25.0Â°C to 1.0 Â°C (call it q4). 5  Set up an energy conservation equation.