Question

The compressor in a refrigerator compresses saturated R-134a vapor at 0°F to 200 psia. Calculate the work required by this compressor, in Btu/lbm, when the compression process is isentropic. Use the tables for R-134a.

Answer 1

The work required is W = 20.2 BTU per lbm

Step-by-step explanation:

The value of entropy & enthalpy at initial conditions are

`h_(1)` = 103.1

S = 0.225

Final enthalpy

`h_(2)` = 123.3

Therefore work done

W =
`h_(1)` -
`h_(2)`

W = 103.1 - 123.3

W = - 20.2 BTU per lbm

Therefore the work required is W = 20.2 BTU per lbm