A team of Anal year project students are designing a range o

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.

Solution

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.

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