53) At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

54) Heat required (in k cal) for converting 1 kg of water at 40 deg C to fully steam

55) Density gradient assisted heat transfer is

56) Temperature can be defined by

57) For same refrigeration load and same temperature limits, the mass flow requirements of Freon-12 and NH3 are in the ratio: