The capacity of a propane vapor-compression refrigeration system
is 8 tons. Saturated vapor at 0°F enters the compressor, and
superheated vapor leaves at 120°F, 180 lbf/in.2 Heat
transfer from the compressor to its surroundings occurs at a rate
of 3.5 Btu per lb of refrigerant passing through the compressor.
Liquid refrigerant enters the expansion valve at 85°F, 180
lbf/in.2 The condenser is water-cooled, with water
entering at 65°F and leaving at 80°F with a negligible change in
pressure. Determine
(a)...