2013-3-6 The Vapor-Compression Refrigeration Cycle Applying mass and energy rate balances Evaporator .=h-hs m (Eq.10.3) The term is referred to as the refrigeration capacity,expressed in kW in the SI unit system or Btu/h in the English unit system. A common alternate unit is the ton of refrigeration which equals 200 Btu/min or about 211 kJ/min. The Vapor-Compression Refrigeration Cycle Applying mass and energy rate balances Compressor =h-h(Eq.10.4) Assuming adiabatic m compression Condenser =-4105 Expansion valve Assuming a throttling (Eq.10.6) process 42013-3-6 4 Evaporator The Vapor-Compression Refrigeration Cycle (Eq. 10.3) ►Applying mass and energy rate balances ►The term is referred to as the refrigeration capacity, expressed in kW in the SI unit system or Btu/h in the English unit system. ►A common alternate unit is the ton of refrigeration which equals 200 Btu/min or about 211 kJ/min. 1 4 in h h m Q = − & & Qin & Compressor Assuming adiabatic compression Condenser Expansion valve Assuming a throttling process The Vapor-Compression Refrigeration Cycle 2 1 c h h m W = − & & 4 3 h = h (Eq. 10.5) (Eq. 10.6) (Eq. 10.4) ►Applying mass and energy rate balances 2 3 out h h m Q = − & &