ᐅ Energy Saving Regulation 2016 or KfW 55 Standard for a Bungalow with Air-to-Water Heat Pump and Controlled Mechanical Ventilation, Optional Photovoltaic System
Created on: 5 Jun 2019 08:25
M
micric3
Good morning,
We are currently in the preliminary planning phase and are being flooded with information from various builders.
The topic of the "Energy Saving Ordinance 2016 or KfW 55 standard" especially leads to additional discussions.
The current concept for a household of four is as follows:
- Underfloor heating + air-to-water heat pump / controlled mechanical ventilation system combo, for example Vaillant recoCOMPACT (alternative: Nibe 730/750)
- Photovoltaic system ready for later retrofitting
- No gas connection possible/available
Opinions from some builders:
- KfW 55 was only attractive because of the low interest rates compared to traditional bank loans
- Currently, few are building to KfW 55 standard; the Energy Saving Ordinance 2016 is 'back in trend'
Calculation from another builder:
30 cm (12 inches) exterior masonry instead of 24 cm (9.5 inches) exterior masonry (both according to Energy Saving Ordinance 2016) = (costs €3,750)
(Additional costs for KfW 55 with 36.5 cm (14 inches) exterior masonry, floor slab insulation, increased roof insulation, and KfW 55 calculations and documentation were (costs €14,680))
I would like to hear some opinions on this:
Good luck
Michael
We are currently in the preliminary planning phase and are being flooded with information from various builders.
The topic of the "Energy Saving Ordinance 2016 or KfW 55 standard" especially leads to additional discussions.
The current concept for a household of four is as follows:
- Underfloor heating + air-to-water heat pump / controlled mechanical ventilation system combo, for example Vaillant recoCOMPACT (alternative: Nibe 730/750)
- Photovoltaic system ready for later retrofitting
- No gas connection possible/available
Opinions from some builders:
- KfW 55 was only attractive because of the low interest rates compared to traditional bank loans
- Currently, few are building to KfW 55 standard; the Energy Saving Ordinance 2016 is 'back in trend'
Calculation from another builder:
30 cm (12 inches) exterior masonry instead of 24 cm (9.5 inches) exterior masonry (both according to Energy Saving Ordinance 2016) = (costs €3,750)
(Additional costs for KfW 55 with 36.5 cm (14 inches) exterior masonry, floor slab insulation, increased roof insulation, and KfW 55 calculations and documentation were (costs €14,680))
I would like to hear some opinions on this:
Good luck
Michael
The sale of photovoltaic electricity is subsidized. However, the installation of systems themselves is not.
This means that producing one kilowatt-hour of electricity using photovoltaics in a private household costs about 4-5 cents. Selling this electricity on the open market would not cover the costs, which is why there is a subsidy guaranteeing a purchase price.
But to claim that production is uneconomical is, from the perspective of the homeowner as an end consumer in the electricity market facing the respective conditions, complete nonsense.
Allowing personal political views to influence customer “advice” is, to put it mildly, unprofessional.
Regarding the 2019 Building Energy Act, it should be noted that the latest draft from the federal government defines the current energy-saving ordinance standard for new buildings as the definition of a low-energy house. Although there is still political debate, the warnings that only passive houses will be allowed in new construction soon are not accurate.
This means that producing one kilowatt-hour of electricity using photovoltaics in a private household costs about 4-5 cents. Selling this electricity on the open market would not cover the costs, which is why there is a subsidy guaranteeing a purchase price.
But to claim that production is uneconomical is, from the perspective of the homeowner as an end consumer in the electricity market facing the respective conditions, complete nonsense.
Allowing personal political views to influence customer “advice” is, to put it mildly, unprofessional.
Regarding the 2019 Building Energy Act, it should be noted that the latest draft from the federal government defines the current energy-saving ordinance standard for new buildings as the definition of a low-energy house. Although there is still political debate, the warnings that only passive houses will be allowed in new construction soon are not accurate.
nichts zu schwör schrieb:
@lesmue79
You cannot skip the insulation, as it is already required to comply with the 2013 Energy Saving Ordinance. Also, you are overlooking the thermal bridge correction, which means you can no longer apply an optimized standard value for the building. This means not only is your calculation incorrect, but achieving any KfW-certified house is impossible, no matter how inefficient it is.
[/SIZE]Currently, according to the latest thermal protection verification including circulation and 10cm (4 inches) of Styrodur under the slab, the building’s heat transfer coefficient (HT-value) is 0.14 and is just barely missing the KfW 40 standard. When I enter the values into the widely known Energy Saving Ordinance heating load calculator, I end up with about 2.5 kW... So I’m still below my maximum heating load, as long as the general contractor doesn’t come back with a 5 kW heat pump and a supply temperature design for the underfloor heating of 35°C (95°F), I’ll be happy.
N
nix zu schwör23 Jul 2019 18:36@guckuck2
The purchase, installation, and feed-in are subsidized.
The 4-5 cents/kWh are only achieved with a modern medium-sized power plant, according to the current Fraunhofer ISE study dated May 29, 2019.
The problem remains storage, as energy is generated at times when it is not needed in a private household (cold winter nights).
The levelized cost of electricity from photovoltaic systems increases by approximately 2.7 €cents/kWh.
For comparison: Coal power costs 3-7 cents/kWh, gas power costs 6-9 cents/kWh.
Quote regarding self-consumption:
The self-consumption user cannot consider the full difference between their gross electricity price (for supply from the grid) and the Renewable Energy Act remuneration (used as an estimate for their own electricity generation costs) as a “profit.” On the one hand, self-consumption increases the fixed costs per externally purchased kilowatt-hour. When the same connection fees are spread over a smaller electricity consumption volume, the cost of electricity from the grid (cents/kWh) increases. It should also be noted that taxes and levies may apply to electricity taken from a photovoltaic system for self-consumption, depending on the tax classification of the system.
The purchase, installation, and feed-in are subsidized.
The 4-5 cents/kWh are only achieved with a modern medium-sized power plant, according to the current Fraunhofer ISE study dated May 29, 2019.
The problem remains storage, as energy is generated at times when it is not needed in a private household (cold winter nights).
The levelized cost of electricity from photovoltaic systems increases by approximately 2.7 €cents/kWh.
For comparison: Coal power costs 3-7 cents/kWh, gas power costs 6-9 cents/kWh.
Quote regarding self-consumption:
The self-consumption user cannot consider the full difference between their gross electricity price (for supply from the grid) and the Renewable Energy Act remuneration (used as an estimate for their own electricity generation costs) as a “profit.” On the one hand, self-consumption increases the fixed costs per externally purchased kilowatt-hour. When the same connection fees are spread over a smaller electricity consumption volume, the cost of electricity from the grid (cents/kWh) increases. It should also be noted that taxes and levies may apply to electricity taken from a photovoltaic system for self-consumption, depending on the tax classification of the system.
N
nix zu schwör24 Jul 2019 12:26This is what Fraunhofer (ISE) states, not me, see the quote.
However, you can also refer to the latest figures from Elon Musk and his Powerwall from SolarCity. Updated data has also been published on this. The average efficiency is around 15% for new installations.
Degradation of up to 25% after one year lowers the value to about 11%.
See also manufacturer warranties, which generally do not guarantee more than 80% performance after the typical 20-year depreciation period.
You can also publicly check subsidies, such as those from KfW or ongoing feed-in tariffs.
These are simply technical and economic data related to this technology, comparable to those available for other technologies.
However, you can also refer to the latest figures from Elon Musk and his Powerwall from SolarCity. Updated data has also been published on this. The average efficiency is around 15% for new installations.
Degradation of up to 25% after one year lowers the value to about 11%.
See also manufacturer warranties, which generally do not guarantee more than 80% performance after the typical 20-year depreciation period.
You can also publicly check subsidies, such as those from KfW or ongoing feed-in tariffs.
These are simply technical and economic data related to this technology, comparable to those available for other technologies.
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