A compressor brings R134a from 150 kPa,−10 to 1200 kPa, 50. It is water cooled, with heat loss estimated as 40 kW, and the shaft work input is measured to be 150 kW. What is the mass flow rate through the compressor?
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The air conditioner in an automobile uses R134a and the compressor power input is 1.5 kW, bringing the R134a from 201.7 kPa to 1200 kPa by compression. The cold space is a heat exchanger that cools atmospheric air from the outside at 30 down to 10 and blows it into the car. What is the mass flow rate of the R134a, and what is the low-temperature heat transfer rate? What is the mass flow rate of air at 10?
A two-stage compressor in a gas turbine brings atmospheric air at 100 kPa, 17 to 500 kPa, then cools it in an intercooler to 27 at constant P. The second stage brings the air to 2500 kPa. Assume both stages are adiabatic and reversible. Find the combined specific work to the compressor stages. Compare that to the specific work for the case of no intercooler (i.e., one compressor from 100 to 2500 kPa).