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: | 55 % | 44 % |
| Air flow: | 40 l/s | 40 l/s |
| Total pressure: | 48 Pa | 33 Pa |
| Air speed: | 1.6 m/s | 1.63 m/s |
| Input power: | 18 W | 13 W |
| Annual fan energy consumption | 277 kWh | |
| SFP value: | 0.79 kW/(m³/s) | |
| Plate heat exchanger: | Supply: | Extract: |
| Pressure drop: | 28 Pa | 28 Pa |
| Efficiency with equal airflows: | 61.6 % | |
| Supply air temperature after the heat exhanger | 3.0 °C | |
| Postheating demand at the calculation point: | 632 W | |
| DIVK sound values at the calculation point | Lw | LwA |
| Supply air duct: | 56.6 dB | 45.7 dB(A) |
| Extract air duct: | 52.1 dB | 37.7 dB(A) |
| Soundpressure level in the room (10m² absorbtion LpA) |
32.8 dB(A) | |
| SPL-levels by the octavebands | ||||||||||
| 63 | 125 | 250 | 500 | 1k | 2k | 4k | 8k | dB | dB(A) | |
| Through the casing to the room | 50 | 51 | 42 | 37 | 29 | 15 | 12 | * | 53.4 | 36.8 |
| Supply | 48 | 48 | 44 | 45 | 41 | 39 | 29 | 18 | 56.6 | 45.7 |
| Extract | 46 | 45 | 44 | 39 | 24 | 25 | 7 | * | 52.1 | 37.7 |
| * The sound level of the measurement does not exceed the background noise level | ||||||||||
| Calculation of annual efficiency: | ||
| Exhaust air temperature: | -8.0 °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: | 3858 kWh | |
| Total energy consumption for ventilation | 2493 kWh | |
| HRV annual efficiency: | 60.7 % | |