Refrigerant-134a enters a compressor as a saturated vapor at 160 kpa at a rate of 0.03 m3/s and leaves at 800 kpa. the power input to the compressor is 10 kw. if the surroundings at 20°c experience an entropy increase of 0.008 kw/k, determine (a) the rate of heat loss from the compressor, (b) the exit temperature of the refrigerant, and (c) the rate of entropy generation.

a)

b) T_2 = 36.4 degree C

c)

Explanation:

Given data:

volumetric flow

power input

entropy = 0.008 kW/K

from refrigerant table for P_1 = 160 kPa and x_1 = 1.0

a) mass flow rate

heat loss

heat loss

b) from energy balance equation

from refrigerant table, for P_2 = 800 kPa and h_2 = 272.67 kJ/kg

T_2 = 36.4 degree C

c) from refrigerant table P_2 = 800 kPa and h_2 = 272.67 kJ /kg

rate of entropy

rate of entropy for entire process

the clapeyron equation (also called the clausius-clapeyron equation) relates the slope of a reaction line on a phase diagram to fundamental thermodynamic properties.

explanation: