ᐅ Gas heating plus photovoltaic system possible without proof
Created on: 12 Dec 2019 16:30
L
lucciano-s
Hello, I have a question and urgently need your expertise.
I am planning a new build using monolithic construction with Poroton 36.5cm (14.4 inches) blocks without an external thermal insulation composite system.
Now, instead of an air-source heat pump, I would like to install a gas heating system. Unfortunately, my architect’s 2016 energy calculation software only offers the option of a solar thermal system. This is how compliance with the energy-saving ordinance (EnEV) is demonstrated. However, for me, solar thermal is becoming outdated, and I would prefer gas combined with photovoltaic panels. Allegedly, this should be possible with a gas heating system and 10m² (108ft²) of photovoltaic without further proof…
Can anyone provide more details or a tip on where I can officially verify this?
The calculations of the various options currently show the following for our house…
1. With air-source heat pump
Primary energy demand is 36.2 kWh/m²*a and
corresponds to KfW Efficiency House 55.
2. Option: Gas + Solar + Ventilation system
Primary energy demand is 45.1 kWh/m²*a and
corresponds to KfW Efficiency House 70.
3. Option: Gas + Ventilation system
Primary energy demand is 58.10 kWh/m²*a
Efficiency house rating is 82.1% and proof of compliance not achieved.
4. Option: Gas with solar thermal
Primary energy demand is 52.9 kWh/m²*a, requirement value 53.1 — > energy-saving ordinance fulfilled.
I am planning a new build using monolithic construction with Poroton 36.5cm (14.4 inches) blocks without an external thermal insulation composite system.
Now, instead of an air-source heat pump, I would like to install a gas heating system. Unfortunately, my architect’s 2016 energy calculation software only offers the option of a solar thermal system. This is how compliance with the energy-saving ordinance (EnEV) is demonstrated. However, for me, solar thermal is becoming outdated, and I would prefer gas combined with photovoltaic panels. Allegedly, this should be possible with a gas heating system and 10m² (108ft²) of photovoltaic without further proof…
Can anyone provide more details or a tip on where I can officially verify this?
The calculations of the various options currently show the following for our house…
1. With air-source heat pump
Primary energy demand is 36.2 kWh/m²*a and
corresponds to KfW Efficiency House 55.
2. Option: Gas + Solar + Ventilation system
Primary energy demand is 45.1 kWh/m²*a and
corresponds to KfW Efficiency House 70.
3. Option: Gas + Ventilation system
Primary energy demand is 58.10 kWh/m²*a
Efficiency house rating is 82.1% and proof of compliance not achieved.
4. Option: Gas with solar thermal
Primary energy demand is 52.9 kWh/m²*a, requirement value 53.1 — > energy-saving ordinance fulfilled.
Subwkloofer4 Jan 2020 14:45It’s exactly the same for us.
If gas is used, then only with solar support.
A ventilation system provides additional improvements but unfortunately doesn’t eliminate the need for solar thermal.
Photovoltaics would be great, but that doesn’t apply to gas because you can’t support a gas heating system with electricity—only with solar and a water heat storage tank.
If gas is used, then only with solar support.
A ventilation system provides additional improvements but unfortunately doesn’t eliminate the need for solar thermal.
Photovoltaics would be great, but that doesn’t apply to gas because you can’t support a gas heating system with electricity—only with solar and a water heat storage tank.
B
boxandroof4 Jan 2020 14:56As Dr. Hix writes, gas heating combined with controlled residential ventilation is not impossible, even with insulation levels worse than KfW55.
I would avoid solar thermal and reserve the space for photovoltaic panels.
I would avoid solar thermal and reserve the space for photovoltaic panels.
So, 2 out of the 3 general contractors we shortlisted back in 2016 still build their standard, code-compliant energy-saving houses with gas heating and mechanical ventilation with heat recovery. The previous building was just replaced with mechanical ventilation with heat recovery in 2016. Both are not large contractors, and the houses are quite ordinary; it doesn’t seem to be rocket science.
Subwkloofer4 Jan 2020 22:46Well, for us (two-story city villa, 137sqm (1475 sq ft) with a basement), it seems almost impossible without solar, if you believe the energy consultant. Maybe in your case, it’s due to the house itself (KFW insulation standard) or the heating system.
What kind of heating system (kW and storage size) is planned to be installed, and what is the size of your house in square meters?
What kind of heating system (kW and storage size) is planned to be installed, and what is the size of your house in square meters?
Subwoofer schrieb:
Well, for us (two-story city villa, 137 sqm (1476 sq ft) with a basement), it seems almost impossible without solar power—if you believe the energy consultant.
Maybe for you, it’s due to the house itself (KFW insulation standard) or the heating system.
What kind of heating system (kW and storage size) will be installed, and how many square meters is your house planned to be? If you mean me, we built a single-story city villa, 160 sqm (1722 sq ft) with an extension, meeting KFW 55 standards, equipped with a heat pump and centralized mechanical ventilation with heat recovery. Since this was fixed from the beginning, KFW 55 was overall the most cost-effective option due to the conditions, and we found the heat pump more appealing, so gas was not an option for us.
However, any typical standard house, including ours, built to standard energy saving regulations, is equipped with a standard gas condensing boiler and decentralized mechanical ventilation with heat recovery by Lunos. Check out the websites of Tönjes and Meichsner or Ernst and Ernst and show them to your energy consultant.
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