A heat pump can give an annual gain of several thousand flaps, showing our calculus.
Winter is the time when most Norwegians go to the electricity bill especially after the seams and try to find ways to reduce the costs of.
Simple tricks to keep the cold out remove some energy sources, but to cut the electricity bill so that monner requires you to be willing to invest a few thousand flaps.
Heat pumps are thus recognized as a good alternative for those who want a good-value heating option in the home. And the claims have consistently been that heat pumps are cost-effective. We wanted to test this hypothesis.
The result proved to support the claim for cost savings. However, in order to take advantage of the savings potential, it is crucial that the heat pump is placed where the hot air can flow as little as possible.
5000 kr in power cut
According to NOVAP, the Norwegian Heating Pump Association, there are more than 600,000 heat pumps installed in Norwegian homes. The majority of these are so-called air-to-air pumps. For 2013 it is assumed that it will be installed or replaced around 70,000 air-to-air pumps.
And maybe one of these end up with you?
If so, you have made an investment that will reduce your power costs. And maybe that was also meant.
According to our calculations, a heat pump could reduce the annual energy costs by up to 5,000 kroner, and then the investment cost and depreciation are calculated with.
Economy and increased comfort
Pros and cons of air-to-air heat pump
- The heat pump has thermostat control.
- The heat pump is easy to install and can be reinstalled in most homes
- Moderate investment costs in relation to energy savings
- An air heat pump can be driven in reverse and provide cooling when it’s hot outside
- The heat pump ensures even heat and filters away dust particles
- The heat pump is a point heating source and depends on an open plan solution for the best distribution of heat in the home.
- The heat pump has the lowest heat factor and the lowest heat output when the heat demand is greatest – there is little heat to catch in outdoor air on the coldest days. The need for additional heat is greater than with other alternative heating methods
- When outside temperatures below 2 to 5 ° C, moisture in the air is deposited as the rim on the evaporator surface, and defrosting is required. Upon defrosting the plant’s heat factor will decrease
- Humid and saline air can shorten the life of the heat pump evaporator
- The air filter in the interior must be vacuum cleaned and / or replaced regularly to maintain the heat factor
In our calculation we have based on the heating needs that the Consumer Council uses in its heat pump tests. They operate with three so-called annual average temperatures, depending on where in the country you live. In addition, they have set up a low and high heating requirement. This gives the following six heating scenarios (Annual average temperature / heating requirement):
- 8 degrees / 9100 kWh
- 8 degrees / 16000 kWh
- 6.1 degrees / 11000 kWh
- 6.1 degrees / 20000 kWh
- 1.3 degrees / 15400 kWh
- 1.3 degrees / 28000 kWh
Furthermore, we have assumed that 60 per cent of the heating requirement is covered by a vapor pump, and we have assumed SSB’s quarterly statistics on power prices and grid rent, which gave an annual average of 83.48 øre for the period 3. kv. 2011 to 3. Q 2012. In conclusion, we used the following quarterly distribution of power consumption: 34%, 19%, 16% and 31%. The annual savings were as follows (quality assured by Enova’s answer service):
- kr 1363
- kr 1757
- kr 3427
- kr 3167
- kr 4081
- kr 5263
The calculations show that the greater your heating needs, the greater the savings.
If we increase the heat pump share from 60 to 70 percent, the estimates show that the savings will rise further and will be almost 6500 kroner for the most heat-intensive scenario.
– Economy is of course an important factor when the consumer decides to invest in heat pump, but we also know that those who have installed a pump experience that they get increased heat comfort because a heat pump is spreading the heat better, says General Manager at NOVAP , Baard Baardsen, to Bonytt. no.
– And we also know that more and more want water-borne heat with heat pump, because this provides better comfort than traditional heating.
According to senior researcher Tor Helge Dokka at Avd. Energy and architecture at SINTEF Building Research, there are certain prerequisites that must be in place for the mathematics to vote.
– 60 percent heat pump share of heating is a common number to use, but it requires a fairly free circulation of the hot air around the house, he says to bonytt. no.
– But that’s where there are strong closed plan solutions, like in houses with many smaller rooms and doors, one will not be close to reaching 60 percent. There maybe only 40 percent.
Here are the best heat pumps
And, according to our calculus, a heat pump share of only 40 percent will only provide a noticeable gain in heating requirements of over 15,000 kWh, equivalent to an energy consumption of around 25,000 kWh.
– In some cases where the floor plan is particularly open, it is likely that the heat pump will cover up to 80 percent of the heat demand, explains Dokka.
In our calculation it will give a gain of 2500 kroner already at the lowest heating requirement.
The location of the heat pump’s interior is therefore essential for a good utilization of the pump. Its better hot air from it can circulate to the different rooms of the house, the higher its use will be.
– It is also important that there are not too many other active heat sources in the home, such as panel heaters or floor heating, as this can cause the heat pump to be idle for long periods, expands Dokka.
Bonytt. no has regularly reviewed tests conducted by the Swedish Energy Agency and presented by the Consumer Council. In these tests, relatively little emphasis has been placed on noise. The explanation according to the Consumer Council is that noise is often a subjective size.
However, in a recent decision by the County Governor of Telemark (FmTe), a heat pump owner has been required to shut down his pump at night. Cause: Noise, according to no. no.
– This is not a single case, says senior consultant Roger Jensen at FmTe to Bonytt. no.
– But it is usually settled before it comes to the municipality or the county governor. This is nevertheless a problem we think we will see more of in the future.
This gives the best effect of the heat pump in the cold
The decision was based, among other things, on Norsk Standard 8175, “Sound conditions in buildings”. This states that the noise level for noise outside the bedroom window at night should not exceed 35 dBA.
– We are aware that noise is a factor in air-to-air pumps, but we also know that manufacturers are working to produce pumps that noise less, says Baard Baardsen.
– There are also heat pumps with features that reduce operation at night, and therefore noise levels.
However, it is important to note that heat pumps that sound, are often installed incorrectly or in other ways do not work optimally, he emphasizes.
– And some of the problem is due to the self-assembly of the pump, so we emphasize that a heat pump should be fitted by a specialist. And to our members, we also emphasize the importance of noise-reducing measures.
– In the near future, a new energy labeling will enter into force, which means that all heat pumps sold must be labeled with noise levels, Baardsen explains..
(The regulations Baardsen refers to was intended to come into force 1. January, but according to NVE, it is exposed as a result of EEA issues).
Municipal support for heat pump
Some municipalities provide support for the installation of heat pumps. On the heat pump info. no, you will find an overview of which municipalities as on. t provide support.
However, according to the website, it is smart to be early with the application for support because the municipalities have limited funds.
And according to the heat pump info. No, several municipalities have application deadlines, so it may make sense to contact as soon as possible.
Enova also has support schemes, but it does not apply to air-to-air pumps.
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