dymonite69
30-08-2010, 06:05 AM
I suspect my heat pump is needing more electricity to heat our house than necessary.
We have a well insulated house with double glazing.
I made some thermal conductivity calculations and estimate that the entire house should be losing around 5.5 kW. This is based on the R values of the building materials and the indoor-outdoor temperature gradient.
We have a Daikin 15.5 kW inverter system.
My assumption is that the amount of heat lost by the house needs to be equally replaced by the AC.
However, our electricity consumption suggests that the unit is putting out 10-12 kW heating energy * continuously just to maintain our thermostat setting. This is at least double what I would expect. Furthermore we only condition half the house at any point in time.
Is there a way of knowing the true heating output of the unit given its electricity consumption.
I would be grateful for any comments.
* Assumes COP 3 (outdoor 6C indoor 21C)
We have a well insulated house with double glazing.
I made some thermal conductivity calculations and estimate that the entire house should be losing around 5.5 kW. This is based on the R values of the building materials and the indoor-outdoor temperature gradient.
We have a Daikin 15.5 kW inverter system.
My assumption is that the amount of heat lost by the house needs to be equally replaced by the AC.
However, our electricity consumption suggests that the unit is putting out 10-12 kW heating energy * continuously just to maintain our thermostat setting. This is at least double what I would expect. Furthermore we only condition half the house at any point in time.
Is there a way of knowing the true heating output of the unit given its electricity consumption.
I would be grateful for any comments.
* Assumes COP 3 (outdoor 6C indoor 21C)