GATE ME 2014 Set 2 — Question 59

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NAT+2 / -0HardVapour Compression CycleRefrigeration & Air ConditioningThermodynamicsGas & Heat Pump Cycles

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 20C-20^\circ\text{C} and 25C25^\circ\text{C}. The heat required is 200 MJ/h200\text{ MJ/h}. Assume specific heat of vapour at the time of discharge as 0.98 kJ/kg.K0.98\text{ kJ/kg.K}. Other relevant properties are given below. The enthalpy (in kJ/kg) of the refrigerant at isentropic compressor discharge is _______.
Saturation temperature Tsat(C)T_{\text{sat}} (^\circ\text{C})Pressure P(MN/m2)P (\text{MN/m}^2)Specific enthalpy hf(kJ/kg)h_f (\text{kJ/kg})Specific enthalpy hg(kJ/kg)h_g (\text{kJ/kg})Specific entropy sf(kJ/kg.K)s_f (\text{kJ/kg.K})Specific entropy sg(kJ/kg.K)s_g (\text{kJ/kg.K})
20-200.24480.2448177.21177.21397.53397.530.91390.91391.78411.7841
25251.0481.048230.07230.07413.02413.021.10471.10471.71831.7183
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