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Consider a residential heat pump that uses lake water as the heat source in the winter...

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Mechanical Engineering

Consider a residential heat pump that uses lake water as theheat source in the winter and as heat sink inthe summer. The houseis to maintained at a winter temperature of T= 18 degrees C and asummer temperature of T= 25 degrees C. To do this efficiently, itis found that the indoor coil should be at T= 50 degrees C in thewinter and T= 5 degrees C in the summer. The outdoor coiltemperature can be assumed to be T= 5 degrees C during the wintermonths and T= 35 degrees C during the summer. Using R-134a as theworking fluid.

For the winter months,

(a) The coefficient of performance for a Carnot heat pump cycleoperating at the given temperatures.

(b) Determine the temperature and pressures at the principalstates of the cycle.

(c) The power input to the compressor, in kJ/kg.

(d) The thermal efficiency (coefficient of performance)

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