ᐅ Gas heating plus photovoltaic system possible without proof
Created on: 12 Dec 2019 16:30
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lucciano-sL
lucciano-s12 Dec 2019 16:30Hello, 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 However, for me, solar thermal is becoming outdated, and I would prefer gas combined with photovoltaic panels.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 However, for me, solar thermal is becoming outdated, and I would prefer gas combined with photovoltaic panels.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.
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lucciano-s12 Dec 2019 17:06Ideally, I would prefer just a gas system combined with a central ventilation system with heat recovery...
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hampshire13 Dec 2019 11:22Where is the problem? That the program isn’t working? The solutions are available after all.
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lucciano-s13 Dec 2019 13:36If we only use gas heating with a central ventilation system, unfortunately, the target value will not be reached.
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hampshire13 Dec 2019 15:12Is the value for a subsidy or the legally required value? You can choose to forgo a subsidy if you want. We have a system that is not eligible for funding and falls outside the KfW guidelines. We simply wanted it that way and proceeded accordingly.
Search engine: "photovoltaic system energy saving ordinance," the first PDF directly.
Otherwise, when dealing with gas and controlled mechanical ventilation, you have only four adjustment options:
1) Improve insulation
2) Fine-tune the default values (the DIN standard uses outdated values that modern systems actually exceed)
3) Optimize system technology (shorter or better-insulated pipes, installation location inside heated areas, etc.)
4) Access alternative "energy sources" (e.g., shower pipe or stove)
Otherwise, when dealing with gas and controlled mechanical ventilation, you have only four adjustment options:
1) Improve insulation
2) Fine-tune the default values (the DIN standard uses outdated values that modern systems actually exceed)
3) Optimize system technology (shorter or better-insulated pipes, installation location inside heated areas, etc.)
4) Access alternative "energy sources" (e.g., shower pipe or stove)
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