Heat pump / final energy demand / annual performance factor

  • Erstellt am 2015-12-01 13:55:07

Saruss

2015-12-03 19:54:34
  • #1

Regarding 2) I would just ignore the solar production for heating, since this does not really matter during heating demand in winter/night anyway.
Then it means 45 kWh/m²a * 155 m² = 6975 kWh heating demand (estimated).
Now divide by the performance factors, which results in the electricity demand,
e.g. 6975 / 3.34 = 2088 or 6975 / 4.67 = 1493 (in kWh, so about 600 kWh difference, approx. 130€ per year).
However, this is only a very rough calculation; since it is only the energy saving ordinance calculations ("estimates" according to certain specifications), your heating/use behavior is missing, hot water is not considered (which can especially impact air-water heat pumps on cold days if you need a lot), and so on.
 

Saruss

2015-12-03 20:07:24
  • #2
Too late for edit: I have now looked at my Energy Saving Ordinance calculations: Planned KfW-70 house 160 sqm living area (usable area in the certificate states 289 sqm, as it includes the basement (insulated), which I am partially finishing myself). Heating energy demand 44.27 kWh/m²a Primary energy demand 42.16 kWh/m²a Final energy demand 16.22 kWh/m²a System efficiency factor eP: 0.743 Calculated heating energy demand was therefore approx. 12,000 kWh. My brine heat pump required 2,000 kWh of electricity for one year of heating and hot water. You can already see, reality always looks different. But, for example, the Energy Saving Ordinance also lists maximum (assumed) values for some window areas; I know that my windows are actually a good deal better than what is stated there. Thermal bridges are also only averaged..
 

Uhtred

2015-12-06 12:23:11
  • #3
I can’t say anything about the coverage ratio, only that no large photovoltaic yields are to be expected from December to January. The VAT obligation with photovoltaics is done in order to get the VAT back on the purchase; it can be ended again after 5 years. But you always get your own electricity for free, about 10 ct/kWh. After the first 20 years, you only need to calculate 1 ct/kWh. Otherwise, I am also considering whether a heat pump or direct electric heating will replace my currently old oil heating in a few years.
 

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