Question

Consider a vapor compression refrigeration system suitable for a car having a heat load of 24,000Btu/hr. Assume a worst- case exterior ambient temperature of 120°F and that air is to be delivered to the passenger compartment at 40°. Use a temperature difference of 30°F betweenair and the R134 refrigerant at the two heat exchangers. The compressor efficiency is 75%.

A) Determine the upper and lower pressure limits for the cycle.

B) Carefully find the enthalpies (from the P-h diagram and saturation table) for the fourstates.

C) Determine the required work input (in hp) and the resulting COP.

D) Find the compressor inlet gas flow rate (in CFM). Note that this flow rate, when combined with the required pressure rise across the compressor, should be sufficient

to specify or design the compressor.

E) What is the total heat rejected from the cycle, and what fraction of that heat isassociated with the phase change in the two phase dome?

please if possible include explanations as i want to see if i'm doing this right and my thought processes are correct

Answer 1