ᐅ KfW 70 energy standard with Poroton bricks, domestic hot water heat pump, gas heating, and decentralized ventilation system
Created on: 26 Jan 2014 22:12
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diefamilie1978
Hello experts, homeowners, and friends of energy efficiency,
As a new homeowner (Stuttgart region), I have been focusing strongly on the topic of "energy" for the past few days.
Based on the latest calculations with the architect and structural engineer, a plastered Poroton T8 solid wall (Poroton T8) is fixed. According to the Schlagmann Poroton table, this option with 36.5 bricks meets the KfW 70 requirements.
Triple glazing is also confirmed. The house has a floor area of 220 sqm (2,368 sq ft).
The goal now is to create an optimum for the house’s energy efficiency to achieve KfW 70 without unnecessary financial loss. After the latest energy fair here in the region and initial consultations with building services providers, I see this home energy design as optimal:
1) Domestic hot water heat pump, also supported by photovoltaics, since I will have photovoltaic panels with self-consumption (about 5 kWp from the roof according to the plan)
2) For underfloor heating and peak load in winter, a gas boiler
3) Decentralized ventilation system with heat recovery
Is such a combination sufficient to meet the KfW 70 targets?
If not, where might the weak point in this setup be?
Thanks in advance for any answers or recommendations.
P.S. I removed solar thermal from the plan because, in my case, the payback calculation with photovoltaics and self-consumption is much more attractive.
As a new homeowner (Stuttgart region), I have been focusing strongly on the topic of "energy" for the past few days.
Based on the latest calculations with the architect and structural engineer, a plastered Poroton T8 solid wall (Poroton T8) is fixed. According to the Schlagmann Poroton table, this option with 36.5 bricks meets the KfW 70 requirements.
Triple glazing is also confirmed. The house has a floor area of 220 sqm (2,368 sq ft).
The goal now is to create an optimum for the house’s energy efficiency to achieve KfW 70 without unnecessary financial loss. After the latest energy fair here in the region and initial consultations with building services providers, I see this home energy design as optimal:
1) Domestic hot water heat pump, also supported by photovoltaics, since I will have photovoltaic panels with self-consumption (about 5 kWp from the roof according to the plan)
2) For underfloor heating and peak load in winter, a gas boiler
3) Decentralized ventilation system with heat recovery
Is such a combination sufficient to meet the KfW 70 targets?
If not, where might the weak point in this setup be?
Thanks in advance for any answers or recommendations.
P.S. I removed solar thermal from the plan because, in my case, the payback calculation with photovoltaics and self-consumption is much more attractive.
D
DerBjoern28 Jan 2014 14:22It's quite similar for us as well. In terms of insulation (Ht), we fall between the requirements for KfW40 and KfW55 standards. Without solar support and using only a gas condensing boiler and controlled ventilation with heat recovery, we barely manage to achieve KfW70 in the end.
I also prefer to invest more in insulation than in technology. However, there are limits to what makes sense here...
For small gas condensing boilers in this range, Thision is often mentioned. They have a unit that can modulate down to 1 kW.
I also prefer to invest more in insulation than in technology. However, there are limits to what makes sense here...
For small gas condensing boilers in this range, Thision is often mentioned. They have a unit that can modulate down to 1 kW.
D
diefamilie197829 Jan 2014 20:48Hello everyone,
Thank you very much for the numerous comments. According to the architect, the calculation of the heating demand and related assessments have not been completed yet....
I will update you on the situation as soon as there are any concrete developments.
Thanks again!
Thank you very much for the numerous comments. According to the architect, the calculation of the heating demand and related assessments have not been completed yet....
I will update you on the situation as soon as there are any concrete developments.
Thanks again!
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