Behaim
2012-01-06 18:00:25
- #1
We are currently facing this difficult decision as well. We want to build in summer 2012 and here are a few key data points about the house:
Solid house made of 30cm Poroton bricks + 10cm ETICS polystyrene
Approx. 135 sqm living space
Triple glazing
Decentralized ventilation system Schiedel AERA Comfort (without heat recovery, as we are not convinced of it, we do not want fresh air from a duct system but want to minimize ventilation heat losses)
Roof structure with 20cm insulation between rafters
BRAAS roof tiles
Basement as a white tank, 30cm concrete + 10cm perimeter insulation, floor insulation in basement screed
Large window area facing south, but also dormer windows to the north.
Designed for 2 adults and 2-3 children
So here are my considerations about the heating system:
We want a heat pump, that is certain (so please don’t try to convince otherwise).
a) Ground-source heat pump (Alpha Innotec) with probe drilling (probably up to about 80m possible here with 45W/m efficiency, clayey subsoil)
b) Air-water heat pump with COP >3.5 (Alpha Innotec) in monovalent operation
Possibly there will also be a normal tiled stove in the living-dining area, intended to support heating in the transitional seasons.
Climatically speaking, we are not located in a really favorable region, so rather medium to lower average temperatures compared to climatically favored regions, e.g. in southern Germany.
I am interested in what would make the most sense energetically, completely independent of investment costs. Of course, the investment costs are also interesting, whereby the pure air-water heat pump would of course be the "cheapest"... but is that "economical" for our planned house?
We would like to achieve KfW 70, which should be feasible. Do you see a chance for KfW 55, and what else would be necessary for that?
Many thanks already for the help!
Solid house made of 30cm Poroton bricks + 10cm ETICS polystyrene
Approx. 135 sqm living space
Triple glazing
Decentralized ventilation system Schiedel AERA Comfort (without heat recovery, as we are not convinced of it, we do not want fresh air from a duct system but want to minimize ventilation heat losses)
Roof structure with 20cm insulation between rafters
BRAAS roof tiles
Basement as a white tank, 30cm concrete + 10cm perimeter insulation, floor insulation in basement screed
Large window area facing south, but also dormer windows to the north.
Designed for 2 adults and 2-3 children
So here are my considerations about the heating system:
We want a heat pump, that is certain (so please don’t try to convince otherwise).
a) Ground-source heat pump (Alpha Innotec) with probe drilling (probably up to about 80m possible here with 45W/m efficiency, clayey subsoil)
b) Air-water heat pump with COP >3.5 (Alpha Innotec) in monovalent operation
Possibly there will also be a normal tiled stove in the living-dining area, intended to support heating in the transitional seasons.
Climatically speaking, we are not located in a really favorable region, so rather medium to lower average temperatures compared to climatically favored regions, e.g. in southern Germany.
I am interested in what would make the most sense energetically, completely independent of investment costs. Of course, the investment costs are also interesting, whereby the pure air-water heat pump would of course be the "cheapest"... but is that "economical" for our planned house?
We would like to achieve KfW 70, which should be feasible. Do you see a chance for KfW 55, and what else would be necessary for that?
Many thanks already for the help!