ᐅ Passive house, combined heating system with solar thermal, energy recovery, photovoltaic panels?
Created on: 28 Oct 2009 20:56
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Bunnyguard
So, I plan to have a house built for my family in the near future.
I have decided on a passive house because I want to minimize environmental impact and keep running costs low.
Now I am wondering which heating combinations I should use.
A ventilation system with heat recovery is a must...
Solar energy will be used for domestic hot water in combination with a large buffer tank.
I thought that heat recovery alone might not be enough to maintain the indoor temperature as I want it...
What additional heating options would you recommend?
Geothermal energy? Using solar also for heating? What are the possibilities?
Or is the ventilation with heat recovery sufficient?
I’ve heard that passive houses don’t need extra heating because heat recovery should be enough – is that true?
I’m also thinking about installing some photovoltaic panels on the roof to save even more energy for electrical appliances and the ventilation system’s motors, etc.
What do the experts suggest as a good combination that won’t cause problems, e.g., not keeping the house warm enough?
Many thanks for your help.
PS: Hello to everyone, I’m new here 😀
I have decided on a passive house because I want to minimize environmental impact and keep running costs low.
Now I am wondering which heating combinations I should use.
A ventilation system with heat recovery is a must...
Solar energy will be used for domestic hot water in combination with a large buffer tank.
I thought that heat recovery alone might not be enough to maintain the indoor temperature as I want it...
What additional heating options would you recommend?
Geothermal energy? Using solar also for heating? What are the possibilities?
Or is the ventilation with heat recovery sufficient?
I’ve heard that passive houses don’t need extra heating because heat recovery should be enough – is that true?
I’m also thinking about installing some photovoltaic panels on the roof to save even more energy for electrical appliances and the ventilation system’s motors, etc.
What do the experts suggest as a good combination that won’t cause problems, e.g., not keeping the house warm enough?
Many thanks for your help.
PS: Hello to everyone, I’m new here 😀
In the direct heating system (direct evaporation), the working fluid of the heat pump circulates as the heat transfer medium in the ground collector and evaporates there. An intermediate heat exchanger and brine circulation pump are not required. Seamless copper pipes with a plastic coating are used.
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Photovoltaics is an investment option for your equity capital and is not related to a house. You invest money and expect a return. Let’s assume 3% here. This already excludes borrowed capital, because then you would have no profit left, only loss. You are basically a power producer and therefore also a business operator.
This means that if you achieve, for example, 6% with a well-performing fund, you can offset this profit against your expenses, leaving you with a higher net gain.
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Photovoltaics is an investment option for your equity capital and is not related to a house. You invest money and expect a return. Let’s assume 3% here. This already excludes borrowed capital, because then you would have no profit left, only loss. You are basically a power producer and therefore also a business operator.
This means that if you achieve, for example, 6% with a well-performing fund, you can offset this profit against your expenses, leaving you with a higher net gain.
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Bunnyguard29 Oct 2009 16:22Hmm, if I understand correctly, these are basically ground collectors that can be installed in the garden, and that’s it. How is the heat then transferred into the house? Is it through the air again or in the form of radiators or something similar?
And how many square meters do you need for about 160sqm (1722 sq ft) of living space?
And what does something like that cost?
Would a comfort ventilation system with heat recovery, a small direct expansion (DX) heat pump, and a solar system for hot water be enough?
Or is the register heater in the comfort ventilation still necessary?
And how many square meters do you need for about 160sqm (1722 sq ft) of living space?
And what does something like that cost?
Would a comfort ventilation system with heat recovery, a small direct expansion (DX) heat pump, and a solar system for hot water be enough?
Or is the register heater in the comfort ventilation still necessary?
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6Richtige29 Oct 2009 16:46Hello Bunnyguard,
For the surface collectors, you need approximately 250 meters (820 feet), installed at a depth of about 1.2 meters (4 feet). The costs are around €4500 - €5000, plus approximately €2500 for the groundworks.
Due to the low supply temperature, heat is best distributed using a heat pump with underfloor heating.
For the surface collectors, you need approximately 250 meters (820 feet), installed at a depth of about 1.2 meters (4 feet). The costs are around €4500 - €5000, plus approximately €2500 for the groundworks.
Due to the low supply temperature, heat is best distributed using a heat pump with underfloor heating.
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Bunnyguard29 Oct 2009 16:56Well, I don’t really count earthworks since they cost me almost nothing because of my father.
And can everything be set up so that it’s all automatically controlled, or will I have to adjust it manually every day to keep the house temperature right?
And the hot water is then stored in the buffer tank for domestic hot water, so you have warm water all year round—not just in summer when the solar system is running at full capacity...
In that case, a comfort ventilation system with a heating coil is not necessary, or should it be integrated as a precaution?
So, the best solution for heating a passive house is the following:
- Comfort ventilation with a heating coil and heat recovery
- Solar system for hot water
- Heat pump system for hot water and supplementary heating
Is that correct, or is something missing?
And which manufacturers can be recommended for these components, especially regarding service and support?
And can everything be set up so that it’s all automatically controlled, or will I have to adjust it manually every day to keep the house temperature right?
And the hot water is then stored in the buffer tank for domestic hot water, so you have warm water all year round—not just in summer when the solar system is running at full capacity...
In that case, a comfort ventilation system with a heating coil is not necessary, or should it be integrated as a precaution?
So, the best solution for heating a passive house is the following:
- Comfort ventilation with a heating coil and heat recovery
- Solar system for hot water
- Heat pump system for hot water and supplementary heating
Is that correct, or is something missing?
And which manufacturers can be recommended for these components, especially regarding service and support?
6
6Richtige29 Oct 2009 17:06Planning a passive house is unfortunately not that simple. You really need a competent designer. Local conditions such as the position of the house on the plot, possible shading from trees, and so on must also be taken into account.
Then there are the building components, the U-values of the walls, windows, and so forth. Avoiding thermal bridges, for example, also requires expert knowledge.
For instance, you can have a good debate with me about whether a solar system even makes sense. In summer, you don’t really want to shower that hot, and in winter the system produces little or no benefit. The costs will only pay off after about 60 years, but the system won’t last longer than 15–20 years. However, a solar system always looks good on the energy performance certificate. 😎
Then there are the building components, the U-values of the walls, windows, and so forth. Avoiding thermal bridges, for example, also requires expert knowledge.
For instance, you can have a good debate with me about whether a solar system even makes sense. In summer, you don’t really want to shower that hot, and in winter the system produces little or no benefit. The costs will only pay off after about 60 years, but the system won’t last longer than 15–20 years. However, a solar system always looks good on the energy performance certificate. 😎
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Bunnyguard29 Oct 2009 17:34Of course, this needs to be calculated and planned by a professional.
But you have to inform yourself so that when someone tells you something, you don’t come across as someone who knows nothing and doesn’t know what they want.
Well, if a solar system doesn’t make much sense, I will discuss it with the architect and others, and it will be left out.
If ground collectors provide enough hot water year-round, there’s no need to plan a solar system as well.
In summer, I believe the ground collectors will provide enough hot water anyway, and if they are sufficient in winter, that is perfectly adequate.
The only question is: what happens if the hot water is not enough in winter?
I won’t have a heater to produce hot water...
What do you think, how warm can you heat year-round with heat recovery and ground collectors?
Are there no limitations, or is, for example, anything above 20°C (68°F) not possible?
And what do I want with the energy performance certificate?
Does it offer me any advantages regarding the solar system?
But you have to inform yourself so that when someone tells you something, you don’t come across as someone who knows nothing and doesn’t know what they want.
Well, if a solar system doesn’t make much sense, I will discuss it with the architect and others, and it will be left out.
If ground collectors provide enough hot water year-round, there’s no need to plan a solar system as well.
In summer, I believe the ground collectors will provide enough hot water anyway, and if they are sufficient in winter, that is perfectly adequate.
The only question is: what happens if the hot water is not enough in winter?
I won’t have a heater to produce hot water...
What do you think, how warm can you heat year-round with heat recovery and ground collectors?
Are there no limitations, or is, for example, anything above 20°C (68°F) not possible?
And what do I want with the energy performance certificate?
Does it offer me any advantages regarding the solar system?
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