Hello everyone, I already briefly mentioned in my introduction post that my wife and I have big building plans, which we hope to finally realize within the next few years. I don’t know anyone in my close circle of friends who is building a house, so I’m hoping to get some help here, as I naturally have a thousand questions about various topics! Currently, we are focusing a lot on how we want to heat our home and have quickly agreed that we want a heat pump for both heating and domestic hot water. I find the topic very complex, but if I understand correctly, a heat pump mainly uses renewable environmental energy, but also consumes a small amount of electricity. That’s why we would like to combine it with a photovoltaic system. Does anyone here have experience with this and can share their insights? Do you think this is a good idea? I would be grateful for any input!
The key question is whether this option is feasible. Whether ground drilling is possible and how much it would cost... your property is probably a bit too small for loops. The problem with combining an air-to-water heat pump and a photovoltaic system is that the solar panels mainly generate electricity in spring, summer, and autumn, which are not the months when your air-to-water heat pump consumes a lot of electricity. You also need to check whether there is still an attractive feed-in tariff in your area. Here in Germany, it only makes sense if you consume as much of your own generated electricity as possible. Additionally, the maintenance costs of a photovoltaic system should not be underestimated. After a certain period, the inverters need to be replaced, and the system must not fail at any time during its lifespan; otherwise, the already optimistic calculation falls apart. But no energy consultant will tell you this.
Kekse schrieb:
Nonsense. If that were true, the annual performance factor would be well below 2. I have never heard or read about anyone with such a poor value.Math just isn’t everyone’s strong suit....
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Geothermal energy is not cost-effective for new builds even over 100 years. It can be considered if there is no space for an air-to-water heat pump or for personal conviction.
M
Mottenhausen23 Nov 2018 14:03Milo3 schrieb:
Furthermore, the maintenance costs of a photovoltaic system should not be underestimated. After a certain period, the inverters need to be replaced, and the system must remain functional throughout its entire lifespan; otherwise, the already optimistic cost calculations become invalid.Regular cleaning of the panels is also essential to maintain maximum efficiency. During the summer months, this may not be noticeable, but in autumn and spring, when sunlight angles can be less favorable, any dirt (bird droppings, insect residue, sticky plant seeds, moss spores, etc.) significantly reduces performance. You can imagine how windows or skylights look after half a year without cleaning...
Hirscherlo25 Nov 2018 17:54I would first clarify what options are realistically possible and make sense—starting by exploring the different types of heat pumps. You can also take a closer look at the following points and consider them:
Air-source or water-source heat pump:
Relatively easy to install, suitable both for heating renovations in older buildings and for all well-insulated (!) buildings with little or no garden space. It can be ideally combined with surface heating systems in floors or walls and is space-saving whether installed indoors or outdoors.
Ground-source heat pump:
Usually can be used as the sole heating system. Suitable for old and new buildings with a large, tree-free lot since roots can cause issues. However, a horizontal ground collector requires two to three times the exterior surface area compared to the heated interior space. Vertical ground probes drilled deep into the ground also require a significant amount of property space. This should be taken into consideration.
Groundwater system:
Can also be used as the sole heating system. Suitable for buildings outside protected water areas with very large gardens. It requires two complex boreholes—one for the supply well and one for the return well.
It is definitely possible and makes sense to combine any of these with a photovoltaic system. I have seen this myself with my parents, and they are very satisfied.
Air-source or water-source heat pump:
Relatively easy to install, suitable both for heating renovations in older buildings and for all well-insulated (!) buildings with little or no garden space. It can be ideally combined with surface heating systems in floors or walls and is space-saving whether installed indoors or outdoors.
Ground-source heat pump:
Usually can be used as the sole heating system. Suitable for old and new buildings with a large, tree-free lot since roots can cause issues. However, a horizontal ground collector requires two to three times the exterior surface area compared to the heated interior space. Vertical ground probes drilled deep into the ground also require a significant amount of property space. This should be taken into consideration.
Groundwater system:
Can also be used as the sole heating system. Suitable for buildings outside protected water areas with very large gardens. It requires two complex boreholes—one for the supply well and one for the return well.
It is definitely possible and makes sense to combine any of these with a photovoltaic system. I have seen this myself with my parents, and they are very satisfied.
Hirscherlo schrieb:
Vertical ground probes installed deep underground also require a lot of land area. One needs to be aware of that. Why is that?
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