Question

A heat pump has a heat factor of 2.7. a) What does it mean? Assume that...

A heat pump has a heat factor of 2.7.

a) What does it mean? Assume that the pump costs SEK 90,000 and that the electricity price is SEK 1.5 / kWh. The house has an area of ​​120 m2 and the heating requirement is 25 MWh / year. b) How long does it take for the pump to pay? (We neglect interest rate effects).

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Answer #1

a) The heat factor of the heat pump indicates the number of times the heat energy generated per unit electrical energy consumed.

As heat factor of the heat pump is 2.7 this indicates that the heat pump generates 2.7 kWh of energy by consuming 1kWh of electrical energy.

The house requires 25 MWh of heat energy per year. The price for this requirement is SEK 37500.

If we use heat pump then the number of kWh consumed in an year is 25000/2.7

The new price for one year is SEK 37500/2.7 = SEK 13889

Savings in one year SEK 37500 - SEK 13889 = SEK 23611

The cost of heat pump is SEK 90000.

If we purchase the heat pump then the time taken to pay for it is 90000/23611 = 3.812 years

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