ᐅ New Bungalow Construction – Air-to-Water Heat Pump, Photovoltaic System, and Solar Thermal?
Created on: 21 May 2017 11:44
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pelmenipeter
Hello,
I have a few questions regarding the planning of our new build. We are still quite inexperienced with all aspects of house construction, but the forum has already been very helpful.
A brief background: on Saturday, we visited a show bungalow by Town & Country. We have not yet seen any other model homes. Our goal is a bungalow with approximately 130m² (1400 sq ft) of living space. The model home featured solar thermal heating combined with an air-to-water heat pump, including a storage tank from Rotex. The entire house was equipped with underfloor heating.
We really liked the house overall. However, I have some questions about the heating system. After reading the Rotex brochure, I noticed the high electricity consumption.
My current idea: a bungalow with solar thermal heating, an air-to-water heat pump, plus a photovoltaic system with a battery storage unit. The photovoltaic system is intended to largely supply electricity to the air-to-water heat pump and to charge the battery storage. Since I have not yet experienced how noisy the outdoor unit really is, I also like the idea of having solar thermal panels on the roof.
My questions about this concept are:
1. Does this setup make sense for a build in Brandenburg, around Zossen/Königs Wusterhausen?
2. Or would the solar thermal system be unnecessary?
3. What are the approximate costs associated with each option?
The goal is to efficiently heat a KfW55 bungalow. Although, I am not sure if photovoltaic only combined with an air-to-water heat pump is sufficient for that.
Best regards,
Peter
I have a few questions regarding the planning of our new build. We are still quite inexperienced with all aspects of house construction, but the forum has already been very helpful.
A brief background: on Saturday, we visited a show bungalow by Town & Country. We have not yet seen any other model homes. Our goal is a bungalow with approximately 130m² (1400 sq ft) of living space. The model home featured solar thermal heating combined with an air-to-water heat pump, including a storage tank from Rotex. The entire house was equipped with underfloor heating.
We really liked the house overall. However, I have some questions about the heating system. After reading the Rotex brochure, I noticed the high electricity consumption.
My current idea: a bungalow with solar thermal heating, an air-to-water heat pump, plus a photovoltaic system with a battery storage unit. The photovoltaic system is intended to largely supply electricity to the air-to-water heat pump and to charge the battery storage. Since I have not yet experienced how noisy the outdoor unit really is, I also like the idea of having solar thermal panels on the roof.
My questions about this concept are:
1. Does this setup make sense for a build in Brandenburg, around Zossen/Königs Wusterhausen?
2. Or would the solar thermal system be unnecessary?
3. What are the approximate costs associated with each option?
The goal is to efficiently heat a KfW55 bungalow. Although, I am not sure if photovoltaic only combined with an air-to-water heat pump is sufficient for that.
Best regards,
Peter
Joedreck schrieb:
Drilling costs about €12,000 at a company here.The drilling depth depends on the building’s heating load and the geothermal yield of the ground. So first calculate the heating load, then determine the required drilling depth (rather than just letting a drilling company start guessing).
With a budget of €12,000, according to the price indication I have, I could drill about 200 meters (650 feet) deep. This would provide extraction capacity suitable for a small multi-family house. I also doubt that the Lower Saxony region would be much more expensive—your quote probably involves some excessive overcharging.
pelmenipeter schrieb:
Since the sun isn’t that intense in our area, I hope to increase self-consumption with the photovoltaic system by using a storage battery.If the photovoltaic system is already unprofitable on its own, then the storage will not improve that situation. On the contrary, both would then be pointless. Have you tried calculating it with PVGIS?
P
pelmenipeter21 May 2017 19:07I wouldn’t say it’s unprofitable; it just takes a few years. Or am I wrong about that?
As for the costs including energy storage, I would need to calculate with a solar installer.
I haven’t done any calculations with PVGIS yet because I didn’t know about it before. But I will do that soon. Let’s see what results come out of it.
As for the costs including energy storage, I would need to calculate with a solar installer.
I haven’t done any calculations with PVGIS yet because I didn’t know about it before. But I will do that soon. Let’s see what results come out of it.
pelmenipeter schrieb:
I wouldn’t say it’s unprofitable, it just takes a few years. Or am I wrong?Well, if the ROI only occurs after 20 years (my calculations including storage go well beyond 40 years...), there is a fair chance that the components will fail by then. Battery manufacturers usually offer a 10-year warranty on 80% of the capacity, after that... good luck.
That’s true, it’s the local company that has never been cheap. The city provides a €2000 (about $2200) subsidy, and since then the price has increased from €10,000 (about $11,000) to €12,000 (about $13,300). However, I haven’t heard of anyone paying less than €8,000 (about $8,900) among my acquaintances.
With a low heating load and a low standard design outdoor temperature, I would definitely prefer an air-to-water heat pump. And absolutely one that can modulate properly.
However, ground-source (water-to-water) heat pumps are actually more efficient. They are also more attractive, especially because of the subsidies, which are almost impossible to reach with air-to-water units.
With a low heating load and a low standard design outdoor temperature, I would definitely prefer an air-to-water heat pump. And absolutely one that can modulate properly.
However, ground-source (water-to-water) heat pumps are actually more efficient. They are also more attractive, especially because of the subsidies, which are almost impossible to reach with air-to-water units.
P
pelmenipeter22 May 2017 13:53After looking at many figures, we have decided not to install a photovoltaic battery storage system for the time being. A photovoltaic system of around 6kWp should break even for us in about 10 to 11 years, depending on costs. That is acceptable to us.
Regarding geothermal energy, I have already read quite a bit. What about maintenance of the collectors or maintenance of the entire system?
Regarding geothermal energy, I have already read quite a bit. What about maintenance of the collectors or maintenance of the entire system?
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