ᐅ Efficiency of Air-to-Water Heat Pumps

Hello forum,

I am currently studying heating technology for new buildings.
Perhaps you can answer one technical question for me so I can better understand the overall system 🙂

An air-to-water heat pump requires electrical power as process energy.

How much heat energy is generated per unit of electrical energy used?

In other words, what is the efficiency of these well-known heat pumps?

Thank you!
Sattler

Ah – understood, the efficiency is expressed by the annual performance factor.

Assuming an annual performance factor of 3.5 (which should be a good average!?), I would have the following consumption per kWh of heat energy:

Gas: Approximately 6 cents per kWh (efficiency 98%)
Heat pump: Approximately 7.14 cents per kWh (efficiency 350%; electricity price 25 cents/kWh)

Is this correct, or am I making a mistake?

Sattler schrieb:
ah - got it, the efficiency is expressed by the annual performance factor.

Not quite correct, efficiencies are power-related values, snapshots. For air source heat pumps => COP.

Sattler schrieb:
...with an assumed annual performance factor of 3.5 (Probably a good average!?)

Hardly, this is only achieved with very good overall planning. Due to planning deficiencies, sometimes only 1.8...2.3 are reached. => money pit.

Sattler schrieb:
....(efficiency 98%)

Here, the annual utilization factor also applies. It can be as low as ~ 50%. With good planning, 80..85% can sometimes be achieved. ;-)

best regards