Composition of heating demand in the area

A survey conducted in 2002 by the workgroup behind the Ballen-Brundby district heating plant received a total of 178 responses from a total of 290 potential consumers in the area.

The energy demand at the time consisted of the following:

  • 171 households and 7 large consumers (industry, hotels)
  • Avg. household size = 125.2 m2
  • 145 households with an avg. oil-based heating demand = 2 150 litres/year
  • 18 households with an avg. electrical heating demand = 10.73 MWh/year
  • 8 households with an avg. combined oil/electrical heating demand = 1 763 litres + 9.79 MWh /year
  • Avg. heating demand from large consumers equal = 67 MWh/year (for simplification, we are going to assume the large consumers are ordinary households in this example, with energy consumption like the oil-based households).

Given that the energy content of oil is 10 KWh/liter (Energy content) the energy consumption of oil is 21.5 MWh/year with solely oil-based heating demand(note that this is not equal to the energy demand, as this needs to be multiplied with the energy efficiency rate for an oil furnaces. Assuming that none of the furnaces are from before 1977, the average efficiency rate is 0.77 (Heat source efficiency) which gives a heating demand of 21.5*0.77 = 16.55 MWh).

In addition to oil consumption, an oil-based boiler uses electricity to work the burner, to circulate heat and for automatic responses, if the boiler is automated. The circulation pump alone uses at least 175 KWh annually in an average household (unless it is a new, energy efficient model), whereas the burner and the automation use a minimum of 100 KWh/year and 35 KWh/year, respectively (Campaign from the Danish Energy Agency(external link)) This sums to a minimum of 310 KWh/year per boiler.

Created by tanja.groth. Last Modification: Friday 02 July 2010 12:00:40 CEST by tanja.groth.