The figure below gives data for an ideal vapor-compression heat pump cycle operating at steady state...

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Mechanical Engineering

The figure below gives data for an ideal vapor-compression heatpump cycle operating at steady state with Refrigerant 134a as theworking fluid. The heat pump provides heating at a rate of 15 kW tomaintain the interior of a building at TH =20°C when the outside temperature is TC =0°C.




State

p
(bar)

h
(kJ/kg)

1

2.4

244.1

2

10

273.6

3

10

105.3

4

2.4

105.3




Determine:

(a) the temperatures at the principal states of the cycle, each in°C.

(b) the power input to the compressor, in kW.

(c) the coefficient of performance.

(d) the coefficient of performance for a Carnot heat pump cycleoperating between reservoirs at the building interior and outsidetemperatures, respectively.

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