Hello,
we would like to build a one-and-a-half-story single-family house with about 125 sqm (1,345 sq ft) plus additional development space in the attic. Without a basement but with a 9 m (30 ft) garage.
We have a plot of land in sight, which we hope to reserve by May. We have already had several appointments with construction companies, including TaC, a developer from Krefeld, and one from Sonsbeck. I feel increasingly uncertain. Both developers offer roughly the same concept, but their prices differ significantly. One says that a ventilation system is not necessary for a KfW 55 solid construction house, while the other says it is very important. I am completely confused. Intuitively, the developer from Sonsbeck was our favorite—until we saw the cost estimate.
It is just too expensive! With TaC, the costs are within our budget, but opinions about the company are mixed.
Does anyone have experience in the NRW area?
Best regards
we would like to build a one-and-a-half-story single-family house with about 125 sqm (1,345 sq ft) plus additional development space in the attic. Without a basement but with a 9 m (30 ft) garage.
We have a plot of land in sight, which we hope to reserve by May. We have already had several appointments with construction companies, including TaC, a developer from Krefeld, and one from Sonsbeck. I feel increasingly uncertain. Both developers offer roughly the same concept, but their prices differ significantly. One says that a ventilation system is not necessary for a KfW 55 solid construction house, while the other says it is very important. I am completely confused. Intuitively, the developer from Sonsbeck was our favorite—until we saw the cost estimate.
It is just too expensive! With TaC, the costs are within our budget, but opinions about the company are mixed.
Does anyone have experience in the NRW area?
Best regards
Alex85 schrieb:
The equation remains incorrect. The auxiliary energy supplied has no direct correlation to the recovered heat energy, so your statement doesn’t make sense. I only read through your discussion after posting (just skimmed).
One kilowatt-hour (kWh) used by a mechanical ventilation system with heat recovery typically saves about 15 to 20 kWh of heating energy on an annual average. Of course, in summer it saves almost nothing, and in winter the savings are considerably more than 20 kWh. This calculation works similarly to heat pumps, and on an annual average, you get around 15 to 20 kWh saved per kWh used (for an average house, etc.).
T
toxicmolotof3 May 2017 22:07Alex85 schrieb:
The equation is still incorrect. The auxiliary energy supplied does not have a direct correlation to the recovered heat energy, so your statement is nonsense.
The question is whether controlled residential ventilation saves heating costs compared to window ventilation. What you have been doing for hours misses the point.No, it doesn’t. Auxiliary energy is and remains energy consumed.
It is undisputed that controlled residential ventilation saves heating energy. I have never claimed otherwise. But what good is it if I save heating energy but need more auxiliary energy instead?
You are ignoring the reality of the energy required (regardless of what it is used for within the system). Either you can’t understand it or you don’t want to. My analysis starts and ends with the electricity (and possibly gas) meter for the entire system (not just one part). That is the only relevant measurement point. It doesn’t help to say that heating costs are (correctly) saved but additional ventilation costs (not mentioned) are added. In both cases, the electricity bill ultimately shows 2000 kWh.
toxicmolotow schrieb:
That mechanical ventilation with heat recovery saves heating energy is undisputed. I have never claimed otherwise. But what use is it if I save heating energy but need more auxiliary energy? As I said, that is not true. For every kWh of electricity used by the mechanical ventilation system, 15 to 20 kWh of thermal energy is saved.
T
toxicmolotof3 May 2017 22:10@Grym
Source? And at which point is the kWh measured?
Let's say 17.5 kWh of heating energy corresponds to only 4 kWh of primary electricity with a good heat pump.
Source? And at which point is the kWh measured?
Let's say 17.5 kWh of heating energy corresponds to only 4 kWh of primary electricity with a good heat pump.
T
toxicmolotof3 May 2017 22:12Heat energy emitted does not equal primary energy used.
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