A team of Anal year project students are designing a range of heating systems fo

Question

A team of Anal year project students are designing a range of heating systems for an eco-house - including a heat pump. Heat pumps can be used to transfer heat against a temperature gradient: e.g. from outside to inside a house. This is achieved by upgrading the heat using the vapour compression cycle, a refrigerant, and heat exchangers. Heat loss calculations show that the house requires 2kW of heating power to maintain the inside temperature at a comfortable temperature. This is provided through a hot air flow, recirculating the air inside the building. The eco-house heat pump uses two "circular tube circular fin compact air blast heat exchangers" as highlighted above; one for the condenser and one for the evaporator. Your assignment is to carry-out design calculations for the condenser heat exchanger, and to recommend design changes to maximise performance, and minimise size.

Explanation / Answer

There appears to be some discrepancy in the data. The temperature of refrigerant in the condenser (-10.090 C ) is lower than the air inlet temperature ( 180 C) to be heated up. Heat can not be transfered from condenser at lower temperature to the air at higher temperature in the condenser.

Please check up data

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