It is desired to replace an existing heating system rated at 90000 Btuhr (input) with an NH3 reversed cycle in order to benefit from the refrigeration; the existing system is 80% efficient. For the NH3 cycle, the evaporator pressure is 37.7 psia and the condenser pressure is 300 psia; the refrigerating effect is 431.7 Btub NH3 and there is no subcooling at the condenser outlet. The NH3 leaves the compressor at 340 °F; the compressor displacement is 18.63 cfin Sketch the TS and ph diagrams. Assume no change in heating requirements and determine
a) the NH3 circulation requirement, based upon the rated output of the existing heating system,
b) the compressor efficiency,
c) the tons of refrigeration for the same cycle,
d) the vohmetric efficiency,
e) Performance factor, COP, and EER.