thermodynamics Refrigeration what is the answer the stepsSol

Solution

for sub cooler we are having same mass flow rate

comming to evaporator i.e inlet to compressor

i am calulating for 1 ton of refrigeration

1 TON=210 kJ/ min

at 30 ^oF amoonia properties are

h for fluid=195.4 kJ/kg

latent heat for ammonia at 30 ^oF=1264.6 kJ/kg

mass flow rate =refrigeration effect/latent heat of vapour= 210/1264.6=0.166 kg/min