Annual efficiency calculator
Select the unit model:
Enter calculation values :
| Supply | Extract | |
| Airflow: | l/s | l/s |
Duct pressure: |
Pa | Pa |
Place:
| Design temperature: | °C |
| Exhaust air temperature limit: | °C |
| Supply air target temperature : | °C |
| Extract air temperature: | °C |
Enter the target information:
| Handler: | |
| Date: | |
| Target: | |
| Name: | |
| Street address: | |
| Postcode: | |
| Post office: | |
| Project: | |
| Positio: | |
| Additional information: | |
Results:
| Results at the calculation point : | Supply: | Extract: |
| Fan speed: | 44 % | 39 % |
| Air flow: | 40 l/s | 40 l/s |
| Total pressure: | 28 Pa | 27 Pa |
| Air speed: | 2.0 m/s | 1.99 m/s |
| Input power: | 16 W | 13 W |
| Annual fan energy consumption | 251 kWh | |
| SFP value: | 0.71 kW/(m³/s) | |
| Plate heat exchanger: | Supply: | Extract: |
| Pressure drop: | 36 Pa | 36 Pa |
| Efficiency with equal airflows: | 84.4 % | |
| Supply air temperature after the heat exhanger | 13.7 °C | |
| Postheating demand at the calculation point: | 113 W | |
| Off | ||
| On | ||
| Temperature after preheating: | - | |
| Preheating power: | - | |
| DIVK sound values at the calculation point | Lw | LwA |
| Supply air duct: | 61.9 dB | 54.2 dB(A) |
| Extract air duct: | 57.4 dB | 34.4 dB(A) |
| Soundpressure level in the room (10m² absorbtion LpA) |
22.0 dB(A) | |
| SPL-levels by the octavebands | ||||||||||
| 63 | 125 | 250 | 500 | 1k | 2k | 4k | 8k | dB | dB(A) | |
| Through the casing to the room | 44 | 37 | 32 | 22 | 18 | 12 | 9 | 1 | 46.4 | 26.0 |
| Supply | 58 | 55 | 49 | 52 | 50 | 49 | 42 | 34 | 61.9 | 54.2 |
| Extract | 41 | 38 | 39 | 30 | 32 | 21 | 13 | 4 | 57.4 | 34.4 |
| * The sound level of the measurement does not exceed the background noise level | ||||||||||
| Calculation of annual efficiency: | ||
| Exhaust air temperature: | -18.7 °C | |
| Exhaust air temperature limit | 0 °C | |
| Air flow ratio supply / extract | 1.00 | |
| Amount of energy required for ventilation: | 6351 kWh | |
| Achieved energy saving: | 4940 kWh | |
| Total energy consumption for ventilation | 1411 kWh | |
| HRV annual efficiency: | 77.8 % | |