Refrigeration and air conditioning numerical | Mira study | Mechanical | Mira study Mechanical |

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Q: A heat pump is used to heat a house in the winter and then reversed to cool the house in the summer. The inside temperature of the house is to be maintained at 20oC. The heat transfer through the house wall is 7.9 KJ/s and the outside temperature in winter is 5oC. What is the minimum power required to drive the heat pump? (in W)

(a) 40.5 (b) 405 (c) 42.5 (d) 425