Unit heat consumption of buildings in Finland

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Question

What is the average unit heat consumption (energy purchase, kWh/m2/year) of different types of residential buildings in Finland?

Characterisation of buildings:

  • Building type (detached house, row house, apartment building)
  • Construction decade
  • Primary heat source (light oil, pellet, district heat, electricity, geothermal)

Answer

Rationale

Heat consumption of a building depends on the outdoor air temperature, preferred indoor air temperature, insulation, air tightness and surface area of the building envelope (walls, roof, floor, windows, doors), ventilation rate and heat recovery from the ventilated air, heating system (efficiency of heat production and recovery of lost heat), hot water demand, internal heat gains from people and electrical equipment, and external heat gains from the sun.

Models for calculating building heat consumption

Outdoor temperature in Finland

  • Finnish Meteorological Institute temperature statistics[3]:
    • Monthly temperatures (Celsius) in different observation points in Finland in 1971-2000
    • Areas (Southern Finland, Western Finland, Eastern Finland, Northern Finland) are defined based on Statistics Finland major regions classification[4]
    • The average monthly temperature in each area has been calculated as the mean of all the observation points (cities) within that area.
Area/City January February March April May June July August September October November December Average for September-May
Southern Finland
Kaarina (Yltöinen) -4.6 -5.5 -1.9 3.1 9.6 14.4 16.9 15.3 10.4 5.7 1 -2.2 1.7
Helsinki-Vantaa (airport) -5.2 -5.7 -2.2 3.3 10 14.6 16.9 15.3 10.1 5.2 0.1 -2.2 1.5
Lahti (Laune) -6.8 -7.3 -2.9 2.8 9.9 14.6 16.6 14.6 9.1 4.2 -0.8 -2.2 0.7
Lappeenranta (airport) -8 -8.1 -3.2 2.5 9.9 14.7 17.2 14.9 9.4 3.9 -1.4 -2.2 0.3
Average -6.2 -6.7 -2.6 2.9 9.9 14.6 16.9 15.0 9.8 4.8 -0.3 -2.2 1.1
Western Finland
Tampere-Pirkkala (airport) -6.7 -7 -2.8 3 9.5 14.4 16.6 14.6 9.4 4.7 -1 -2.2 0.8
Jyväskylä (airport) -8.5 -8.7 -4 1.4 8.7 14 16 13.7 8.2 3.2 -2.2 -6.4 -0.9
Seinäjoki (Pelmaa) -7.1 -7.3 -3.2 2.2 8.8 13.9 15.4 13.8 8.7 3.9 -1.4 -6.4 -0.2
Average -7.4 -7.7 -3.3 2.2 9.0 14.1 16.0 14.0 8.8 3.9 -1.5 -5.0 -0.1
Eastern Finland
Tohmajärvi (Kemie) -10 -9.8 -4.4 1.3 8.6 14 16.1 13.5 8.2 3 -2.9 -6.4 -1.4
Valtimo (Kk) -11.1 -10.8 -5 0.6 8 13.7 16 13.3 7.8 2.3 -3.7 -6.4 -2.0
Siikajoki -9.4 -9 -4.4 1 7.6 13.1 15.5 13 7.9 2.8 -3.1 -6.4 -1.4
Average -10.2 -9.9 -4.6 1.0 8.1 13.6 15.9 13.3 8.0 2.7 -3.2 -6.4 -1.6
Northern Finland
Rovaniemi (airport) -11.7 -11.0 -6.1 -1.0 5.8 12.2 14.9 12.1 6.6 0.2 -6.1 -10.0 -3.7
  • Jylhä et al. 2009[5]
    • Estimates for climate change in Finland by the Finnish Meteorologigal Institute.
    • Projected change in seasonal and annual mean temperature (Celsius) in 2010-2039 relative to 1971-2000 as averaged over the territory of Finland. In addition to the best estimate (50%), six other percentiles of the probability distribution are given. The projection is based on the simulations performed with 19 global climate models, with IPCC greenhouse gas emission scenarios A1B, A2 and B1 considered equally likely.
Probability distribution percentile: 5 % 10 % 25 % 50 % 75 % 90 % 95 %
Winter 1.1 1.4 1.8 2.2 2.7 3.1 3.3
Spring 0.4 0.6 1 1.4 1.9 2.3 2.5
Summer 0 0.3 0.6 1.1 1.5 1.9 2.1
Autumn 0.6 0.8 1.1 1.4 1.7 2 2.2
Annual 0.7 0.9 1.2 1.5 1.9 2.2 2.3

Building structure heat transfer coefficients

  • Development of U-values (W / m2 K) in Finnish building regulations:
1978-1985 1985-2002 2003-2006 2007-2010 2010-
Building structure Mass less than 100 kg / m2 Mass over 100 kg / m2 Warm area > 17 °C Half warm area > 5 °C Warm area > 17 °C Half warm area > 5 °C Warm area 17 °C Half warm area > 5 °C Warm area 17 °C Half warm area > 5 °C
Wall 0,29 0,35 0,28 0,45 0,25 0,45 0,24 0,38 0,17 0,26
Roof 0,23 0,29 0,22 0,45 0,16 0,45 0,15 0,28 0,09 0,14
Floor 0,23 0,29 0,22 0,45 0,16 0,45 0,15 0,28 0,09 0,26
Floor structure directly against ground 0,4 0,4 0,36 0,45 0,25 0,45 0,24 0,34 0,16 0,24
Window 2,1 3,1 1,4 2,1 1,4 1,8 1 1,4
Door 0,7 2,9 1,4 2,1 1,4 1,8 1 1,4


Dependencies

  • Outdoor air temperature
  • Indoor air temperature
  • Building envelope (walls, roof, floor, windows, doors)
    • Insulation (heat conductance)
    • Air tightness (involuntary air leakage)
  • Air ventilation (rate, heat recovery)
  • Heating system (heat production efficiency and heat loss from distribution within a building)
  • Internal heat gains (electrical equipment, people, recovery of heat loss from heat distribution within a building)
  • External heat gains (sun)
  • Hot water demand

Formula

See also

Keywords

Building, heat consumption

References

  1. ↑ Ympäristöministeriö 2007. Rakennuksen energiakulutuksen ja lämmitystehon tarpeen laskenta.. Ohjeet 2007. D5 Suomen rakentamismääräyskokoelma, Ympäristöminiteriö, Asunto- ja rakennusosasto.
  2. ↑ Ympäristöministeriö 2007. Rakennuksen energiakulutuksen ja lämmitystehon tarpeen laskenta.. Ohjeet 2007. D5 Suomen rakentamismääräyskokoelma, Ympäristöminiteriö, Asunto- ja rakennusosasto. Luonnos 28.9.2010
  3. ↑ Ilmatieteenlaitos, kuukausitilastot
  4. ↑ Tilastokeskus, Suomen suuraluejako
  5. ↑ Jylhä et al. 2009. Arvioita Suomen muuttuvasta ilmastosta sopeutumistutkimuksia varten. ACCLIM-hankkeen raportti 2009. Ilmatieteen laitos, raportti 2009:4.

Related files

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Unit heat consumption of buildings in Finland. Opasnet . [1]. Accessed 23 May 2024.


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