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.
Melting and Freezing. If solid matters gain enough heat they change state solid to liquid. Heat is a form of energy and in this situation it is used for the break the bonds of the atoms and molecules. Heated atoms and molecules vibrate more quickly and break their bonds.his is a phase of change of water from solid to liquid. As you can see at the beginning ice is at -15 ÂºC, we give heat and its temperature becomes 0 ÂºC which is the melting point of ice. During melting process temperature of the ice-water mixture does not change.