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SimonMoers27 Dec 2015 20:05Does anyone know exactly how this works? According to the building permit / planning permission, we have a total nominal capacity of 10 kW, but since our architect is extremely incompetent and I have only planned for a 6 kW heating system so far, I would like to know your experiences with the heating capacity for a detached small (120 sqm (1,292 sq ft)) single-family house? We want to heat with geothermal energy and are building at least to the KfW 70 standard. The capacity is now crucial for the borehole depth.
This chart also shows that since 2002, for 100 sqm (1,076 sq ft), 5 kW is assumed.
This chart also shows that since 2002, for 100 sqm (1,076 sq ft), 5 kW is assumed.
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toxicmolotof27 Dec 2015 20:18Well, you can’t really answer that in general terms because there are simply too many factors involved.
Starting with the wall and roof insulation, the amount and insulation quality of the window areas, the building envelope and the ratio of exterior surface to interior volume, all the way to the comfort factor.
For reference: We have a really poor building shape with a large number of exterior surfaces, but very good insulation and well-insulated windows, and we manage with an 8 kW heating system for 125 sq meters (1350 sq ft) of living space plus a utility room, without a basement, including hot water preparation.
But without performing the energy saving calculation required by building regulations (energy performance certificate), you won’t get far; even better would be a heat load calculation that takes into account your personal temperature preferences.
Starting with the wall and roof insulation, the amount and insulation quality of the window areas, the building envelope and the ratio of exterior surface to interior volume, all the way to the comfort factor.
For reference: We have a really poor building shape with a large number of exterior surfaces, but very good insulation and well-insulated windows, and we manage with an 8 kW heating system for 125 sq meters (1350 sq ft) of living space plus a utility room, without a basement, including hot water preparation.
But without performing the energy saving calculation required by building regulations (energy performance certificate), you won’t get far; even better would be a heat load calculation that takes into account your personal temperature preferences.
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SimonMoers27 Dec 2015 20:51Which KfW standard did you build according to?
When is the energy saving regulation (EnEV) calculated? We have just submitted the building permit / planning permission.
What is the heating load for a house with 150 m² (1600 sq ft) of heated floor area and insulation according to the 2009 energy saving regulation (EnEV)?
From Table 31, the specific heating load for insulation according to the 2009 EnEV is 30 W/m² (3 W/sq ft). This results in a heating load of:
Q = 150 m² (1600 sq ft) x 30 W/m² (3 W/sq ft) = 4500 W = 4.5 kW.
If you build to KfW 70 standard, it’s clear that the house is well insulated and the windows have a U-value around 0.7. However, I feel that heating systems are often oversized. That’s why I’m interested to know how large your heating systems are, depending on the floor area and which KfW standard you built to?
When is the energy saving regulation (EnEV) calculated? We have just submitted the building permit / planning permission.
What is the heating load for a house with 150 m² (1600 sq ft) of heated floor area and insulation according to the 2009 energy saving regulation (EnEV)?
From Table 31, the specific heating load for insulation according to the 2009 EnEV is 30 W/m² (3 W/sq ft). This results in a heating load of:
Q = 150 m² (1600 sq ft) x 30 W/m² (3 W/sq ft) = 4500 W = 4.5 kW.
If you build to KfW 70 standard, it’s clear that the house is well insulated and the windows have a U-value around 0.7. However, I feel that heating systems are often oversized. That’s why I’m interested to know how large your heating systems are, depending on the floor area and which KfW standard you built to?
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Sebastian7927 Dec 2015 21:11A heating load calculation according to DIN standards costs around 200 euros – why wouldn’t you invest in that?
Calculating it yourself as a layperson is also a bad idea – you, BeHaElJa, should know that by now.
Calculating it yourself as a layperson is also a bad idea – you, BeHaElJa, should know that by now.
I hired someone who designed the underfloor heating with a supply temperature of 45°C (113°F) and in the end calculated an individual room heating load of 12 kW... which is quite disappointing.
We have 190 sqm (2,045 sq ft) and a 5.3 kW brine-to-water heat pump.
Generalizations like 30 W/sqm (3 W/sq ft) seem questionable to me. As an approximation, sure...
We have 190 sqm (2,045 sq ft) and a 5.3 kW brine-to-water heat pump.
Generalizations like 30 W/sqm (3 W/sq ft) seem questionable to me. As an approximation, sure...
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