GATE ME 2014 Set 2 — Question 59
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Thermodynamics → Refrigeration & Air Conditioning → Gas & Heat Pump Cycles
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Question
A heat pump with refrigerant R22 is used for space heating between temperature limits of and . The heat required is . Assume specific heat of vapour at the time of discharge as . Other relevant properties are given below. The enthalpy (in kJ/kg) of the refrigerant at isentropic compressor discharge is _______.
| Saturation temperature | Pressure | Specific enthalpy | Specific enthalpy | Specific entropy | Specific entropy |
|---|---|---|---|---|---|
Correct answer
430 to 440
Solution
1.Identify states:
- State 1: Inlet to compressor (saturated vapour at ).
- State 2: Outlet of compressor (isentropic compression, ).
At , . Since , the refrigerant is in the superheated region.
3.Calculate superheated temperature ():
4.Calculate enthalpy at discharge ():
.Final answer is in the range 430 to 440.
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