Example Problem - Multistage Refrigeration with Flash Chamber Intercooling
Channel: Thermofluids
Date: 2020-03-24

"A two-stage compression refrigeration system operates with Refrigerant-134a between the pressure limits of 1.4 and 0.1 MPa. The refrigerant leaves the condenser as a saturated liquid and is throttled to a flash chamber operating at 0.4 MPa. The refrigerant leaving the low-pressure compressor at 0.4 MPa is also routed to the flash chamber. The vapor in the flash chamber is the compressed to the condenser pressure by the high-pressure compressor, and the liquid is throttled to the evaporator pressure. Refrigerant flows through the condenser at a rate of 0.25 kg/s. Assuming the refrigerant leaves the evaporator as saturated vapor and both compressors are isentropic, determine:

Determine:
(a) The compressor power
(b) The rate of heat removed from the refrigerated space
(c) The fraction of the refrigerant that evaporates as it is throttled to the flash chamber
(d) The coefficient of performance
(e) The theoretical maximum refrigeration coefficient of performance"

PDF of solution: https://sdsu.box.com/s/06zj4cxbih8q754qdg53tacw2j3p31ho