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Table 3 The results of design power simulations

From: Mapping the low enthalpy geothermal potential of shallow Quaternary aquifers in Finland

Climatic zone I Climatic zone II
(minimum outside temperature = -26C) (minimum outside temperature = -29C)
Class Detached house Apartment building Detached house Apartment building
  Design power (W/m 2 ) Design power (W/m 2 ) Design power (W/m 2 ) Design power (W/m 2 )
  Heating Re-heating of air supply unit Heating Re-heating of air supply unit Heating Re-heating of air supply unit Heating Re-heating of air supply unit
A 97 - 65 - 103 - 69 -
B 34 9 16 12 36 10 17 13
C 25 7 12 10 26 8 13 11
Climatic zone III Climatic zone IV
(minimum outside temperature = -32C) (minimum outside temperature = -38C)
Class Detached house Apartment building Detached house Apartment building
  Design power (W/m 2 ) Design power (W/m 2 ) Design power (W/m 2 ) Design power (W/m 2 )
  Heating Re-heating of air supply unit Heating Re-heating of air supply unit Heating Re-heating of air supply unit Heating Re-heating of air supply unit
A 109 - 74 - 121 - 82 -
B 38 11 18 15 42 14 20 17
C 28 10 14 12 31 12 15 15
  1. The results are divided according to the four climate zone categories in Finland, and the design power is calculated separately for detached houses and apartment buildings. The outside temperature limit for the design is according to the National Building Code of Finland (2012). Class definition: A = House or apartment building built before 1960. Ventilation: natural ventilation, air exchange rate 0.4 l/h. Heat distribution system: water radiators 70/40°C. B = Thermal insulation according the minimum requirement of the National building code of Finland (2010). Ventilation: mechanical supply and exhaust with heat recovery, air exchange rate 0.5 l/h. Temperature ratio of supplied air is 0.6. Air tightness rate (n50) in detached house 2.0 l/h and apartment building 0.7 l/h. Heat distribution system in detached house by hydronic floor heating (design temperatures 40°C/30°C), in apartment building hydronic radiators (design temperatures 70°C/40°C). C = Ultra-low energy building. Ventilation: mechanical supply and exhaust with heat recovery, air exchange rate 0.5 l/h. Temperature ratio of supplied air is 0.85. Air tightness rate (n50) in detached house 0.6 l/h and apartment building 0.6 l/h. Heat distribution system in detached house by hydronic floor heating (design temperatures 40°C/30°C), in apartment building hydronic radiators (design temperatures 70°C/40°C).