What are the temperatures of the evaporator and condenser?

[Zheng_]

Homework Statement

By the data given below,
Condenser Inlet Pressure (P1/kPa) 1164
Condenser Inlet Temperature (T1/K) 382.8
Condenser Outlet Pressure (P2/kPa) 1102
Condenser Outlet Temperature (T2/K) 297.2
Evaporator Inlet Pressure (P3/kPa) 290
Evaporator Inlet Temperature (T3/K) 259.5
Evaporator Outlet Pressure (P4/kPa) 268
Evaporator Outlet Temperature (T4/K) 280.5
find the temperatures of the evaporator and condenser in this Vapor-compression refrigeration cycle.
The pressures are calculated in absolute pressure.

Homework Equations

Basic vapor-compression refrigeration equation.[/B]

The Attempt at a Solution

[/B] Tried to solve by using the Inlet and outlet enthalpy based on P-h cycle of the refrigerant
qe = h4-h3 qc = h2-h1
= 415.433 – 229.4556 =229.4556 – 480.9
= 185.978 kJ·kg-1 = -251.444 kJ·kg-1
not sure if it's correct...

 

[Chestermiller]

I think you are supposed to determine the change in enthalpy of the fluid between the inlet and outlet of the device to determine the heat load, based on the inlet and outlet temperatures they gave you. So, in my judgment, your approach is correct.