Heat loss calculator
Building heat loss to SP 50.13330.2012 “Thermal performance of buildings”
Climate
-28
Building parameters
Building volume:270 m³
Building envelope
Infiltration
AirtightLimitDraughts
Results
Heat loss
Class E
13.80
kW (total)
138
W/m²
ΔT = 48°C (20°C - -28°C)
Loss distribution
Wall 80m²4.45 kW (32%)
Wall 60m²3.03 kW (22%)
Window 12m²1.11 kW (8%)
Window 6m²0.61 kW (4%)
Roof 100m²1.37 kW (10%)
Floor 100m²1.07 kW (8%)
Infiltration2.17 kW (16%)
Annual consumption
34.1
MWh/year
171 000
₽/year (≈5 ₽/kWh)
Calculated from 4943 heating degree-days
Recommendations
- •Specific heat loss is high. Additional insulation is recommended.
Help
Specific heat loss — the building's thermal efficiency figure. Typical for dwellings: 50–90 W/m².
Class A — very high energy efficiency (passive house).
Class C — normal for new buildings under SP 50.13330.2012 (Russian thermal code).