Energy calculator

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Project
Customer
Designed by
Location
A

Default values

Supply air
Extract air
Air flow
Duct pressure
Cooker hood airflow
Learn more

Airflow can either be extracted from a seperate roof fan, or via by-pass from the AHU (selected models). In both cases without heat recovery.

usage time per day
Indoor temperature 21°C
Minimum supply air temperature (+10°C…+21°C)

*) Additional accessories may be needed

Eco-Design requirements
SEC class:
A
SEC cold / average / warm climates
 
-71.6 -35.1 -11.5 / kWh/a.m2
Max airflow rate
288 m3/h
Sound power level:
41 dB(A)
This unit can be equipped with:
Learn more

Central = DCV with one sensor
Local = DCV with more than one

W3 is ventilation unit with counterflow heat exchanger
 
Fan power and energy use EN13141-7
Supply air 31 W
Extract air 29 W
SPI 0.33 W / (m³/h)
SFP 1.20 kW / (m³/s) Learn more

Measurements made according to EN 13141-7.

Annual energy use of fans 526 kWh
 
Energy used to heat the air EN13141-7
Preheating 398 kWh
Reheating to 17 °C 74 kWh 78W peak load
Heating the supply air to 21 °C 1277 kWh Learn more

Heating the supply air is energy consumption consumed when supply air is heated to +21°C degrees.

Heating the infiltraded air to 21 °C 239 kWh Learn more

Warming of infiltrated air is energy consumption consumed when leakage air (outdoor air coming inside from cracks etc.) is heated to +21°C

Energy used to heat up ventilated air to 21°C 1988 kWh
Energy used without heat recovery 7824 kWh
Annual energy efficiency for room (21°C) 75 % Learn more

The part of the annual energy that the unit recovers up to room temperature +21°C

 
Heating the infiltraded air to 17 °C 211 kWh
Energy used to heat up ventilated air to 17 °C 472 kWh
Annual energy efficiency for AHU (17 °C) 94 % Learn more

The part of the annual energy that the unit recovers up to selected supply air temperature

 
Temperature efficiency of heat exchanger 81 % Learn more

Heat exchanger efficiency according to SFS-EN308

Temperature efficiency of air handling unit 81 % Learn more

SFS-EN13141-7 (including fans)

Acoustic data
Octave band (Hz) 63, LW 125, LW 250, LW 500, LW 1k, LW 2k, LW 4k, LW 8k, LW Lwa
Sound emmited to: dB dB dB dB dB dB dB dB dB(A)
supply air duct 75 66 64 58 50 45 38 33 60
extract air duct 54 62 55 41 32 30 22 9 50
outdoor air duct 65 56 54 48 40 35 28 23 50
exhaust air duct 75 67 65 58 50 46 39 33 60
kitchen bypass duct 57 60 57 47 43 40 35 23 52
surroundings 58 50 45 33 27 26 18 11 40
 
surroundings at -4dB sound attentuation Lpa, dB(A) 36

Finnish national regulations

E -value calculation
Energy form factor
1.7
Efficiency
97 %
Efficiency
90 %
Energy form factor
1.7

Finnish national regulations

AHU temperature efficiency 1:1 78 % Learn more

Calculations are done according Finnish national building regulations part D3, D5:2012 and annex 122 by The Ministry of Environment

Defrost start limit 3.2 °C
Annual efficiency of the exhaust air 71 %
 
Preheating 676 kWh
Reheating to 126 kWh
Heating the supply air to 2486 kWh
Heating the infiltraded air to 466 kWh
Energy used to heat up ventilated air to 21°C 3755 kWh