ᐅ Passive house, combined heating system with solar thermal, energy recovery, photovoltaic panels?
Created on: 28 Oct 2009 20:56
B
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 😀
Yes, optionally, but it depends on the overall design.
This needs to be precisely calculated to determine what is best. Also, consider alternatives. A passive house is very sensitive in this regard; you can even push it to an energy-plus house.
However, I won’t do that for you here in the forum.
Best regards
This needs to be precisely calculated to determine what is best. Also, consider alternatives. A passive house is very sensitive in this regard; you can even push it to an energy-plus house.
However, I won’t do that for you here in the forum.
Best regards
Hello everyone,
Building planning can be quite complex. Have you ever considered using concrete core activation in exterior walls with heating loops? Exterior walls often make up the largest surface area of a building to be heated and could provide even temperature heating across living spaces with lower temperatures than underfloor heating. During my online search for "heating loops," I came across an interesting building physics study.
Best regards
Building planning can be quite complex. Have you ever considered using concrete core activation in exterior walls with heating loops? Exterior walls often make up the largest surface area of a building to be heated and could provide even temperature heating across living spaces with lower temperatures than underfloor heating. During my online search for "heating loops," I came across an interesting building physics study.
Best regards
Hello parcus,
I tried to download the file titled "Thermal storage as a media-permeated solid body," but unfortunately, the download failed. I am very interested in the content of this file. Is there any other way for me to access it?
I want to use solar thermal energy, which is available daily but only usable from 30 to 32°C (86 to 90°F) onwards with underfloor heating due to a lack of thermal mass and surface area of the components, to temper interior and exterior walls. For this application, the building walls must meet certain requirements. The exterior wall needs to have a thermal storage core that is very well insulated toward the outside. The interior walls also contain a storage core. As a result, in my example, the heatable surface area is twice the floor area. Since the building volume remains the same, the required operating temperature for the heat-emitting walls must be below the minimum temperature of an underfloor heating system. Thermal energy under 30°C (86°F) distributed over the walls warms the rooms pleasantly and cost-effectively through radiant heat. I accept that the U-value of the exterior wall loses its usual meaning in this construction method. I found information about this building method by searching for wood-cement block. The thermal storage wall system shown there seems logical and buildable to me.
I look forward to your responses on this topic.
Best regards
I tried to download the file titled "Thermal storage as a media-permeated solid body," but unfortunately, the download failed. I am very interested in the content of this file. Is there any other way for me to access it?
I want to use solar thermal energy, which is available daily but only usable from 30 to 32°C (86 to 90°F) onwards with underfloor heating due to a lack of thermal mass and surface area of the components, to temper interior and exterior walls. For this application, the building walls must meet certain requirements. The exterior wall needs to have a thermal storage core that is very well insulated toward the outside. The interior walls also contain a storage core. As a result, in my example, the heatable surface area is twice the floor area. Since the building volume remains the same, the required operating temperature for the heat-emitting walls must be below the minimum temperature of an underfloor heating system. Thermal energy under 30°C (86°F) distributed over the walls warms the rooms pleasantly and cost-effectively through radiant heat. I accept that the U-value of the exterior wall loses its usual meaning in this construction method. I found information about this building method by searching for wood-cement block. The thermal storage wall system shown there seems logical and buildable to me.
I look forward to your responses on this topic.
Best regards
Hello,
Right-clicking and selecting "Save as" should work.
However, I’m having trouble understanding your plans. Assuming one floor is 10 x 10 m (33 x 33 ft), that is 100 sqm (1,076 sq ft).
For reinforced concrete, that would be about 500 kg/sqm (102 lbs/sq ft), so roughly 50 tons.
The wall area 40 m x 2.75 m (131 ft x 9 ft) = 110 sqm (1,184 sq ft) minus at least 10% window area, so almost 100 sqm (1,076 sq ft).
That would be a maximum of 37 tons at 371 kg/sqm (75 lbs/sq ft) according to the brochure.
So approximately 26% less mass.
In addition, effective mass for heat storage is specified as about 50 - 70 kg/sqm (10 - 14 lbs/sq ft).
That would mean a loss of mass of 86 - 90%!
The interior walls are counted as part of the building core anyway. Also, are you planning to heat the external wall up to 30°C (86°F)?
With wood-concrete composites, it is also important to use low-chromate cement to avoid allergies. However, I couldn’t find this information in the eco-certificate.
Sorry, but either I am missing something or the whole thing seems questionable…
Best regards
Right-clicking and selecting "Save as" should work.
However, I’m having trouble understanding your plans. Assuming one floor is 10 x 10 m (33 x 33 ft), that is 100 sqm (1,076 sq ft).
For reinforced concrete, that would be about 500 kg/sqm (102 lbs/sq ft), so roughly 50 tons.
The wall area 40 m x 2.75 m (131 ft x 9 ft) = 110 sqm (1,184 sq ft) minus at least 10% window area, so almost 100 sqm (1,076 sq ft).
That would be a maximum of 37 tons at 371 kg/sqm (75 lbs/sq ft) according to the brochure.
So approximately 26% less mass.
In addition, effective mass for heat storage is specified as about 50 - 70 kg/sqm (10 - 14 lbs/sq ft).
That would mean a loss of mass of 86 - 90%!
The interior walls are counted as part of the building core anyway. Also, are you planning to heat the external wall up to 30°C (86°F)?
With wood-concrete composites, it is also important to use low-chromate cement to avoid allergies. However, I couldn’t find this information in the eco-certificate.
Sorry, but either I am missing something or the whole thing seems questionable…
Best regards
Hello parcus,
right, I didn’t quite understand. I will clarify my thesis and get back to you after the weekend. But allergies caused by cement additives in wood concrete? Why specifically in wood concrete? Where is the medical report on this? I have never heard of that! Why not allergies caused by concrete ceilings or precast lintels or screed concrete or...
Regards
right, I didn’t quite understand. I will clarify my thesis and get back to you after the weekend. But allergies caused by cement additives in wood concrete? Why specifically in wood concrete? Where is the medical report on this? I have never heard of that! Why not allergies caused by concrete ceilings or precast lintels or screed concrete or...
Regards
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