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: | 52 % | 48 % |
| Air flow: | 40 l/s | 40 l/s |
| Total pressure: | 49 Pa | 34 Pa |
| Air speed: | 3.3 m/s | 3.26 m/s |
| Input power: | 21 W | 18 W |
| Annual fan energy consumption | 343 kWh | |
| SFP value: | 0.98 kW/(m³/s) | |
| Plate heat exchanger: | Supply: | Extract: |
| Pressure drop: | 43 Pa | 43 Pa |
| Efficiency with equal airflows: | 83.5 % | |
| Supply air temperature after the heat exhanger | 13.2 °C | |
| Postheating demand at the calculation point: | 134 W | |
| Off | ||
| On | ||
| Temperature after preheating: | - | |
| Preheating power: | - | |
| DIVK sound values at the calculation point | Lw | LwA |
| Supply air duct: | 65.9 dB | 60.9 dB(A) |
| Extract air duct: | 55.9 dB | 42.7 dB(A) |
| Soundpressure level in the room (10m² absorbtion LpA) |
26.8 dB(A) | |
| SPL-levels by the octavebands | ||||||||||
| 63 | 125 | 250 | 500 | 1k | 2k | 4k | 8k | dB | dB(A) | |
| Through the casing to the room | 51 | 45 | 36 | 29 | 15 | 1 | * | * | 53.5 | 30.8 |
| Supply | 61 | 60 | 57 | 54 | 58 | 56 | 49 | 41 | 65.9 | 60.9 |
| Extract | 50 | 46 | 43 | 45 | 40 | 33 | 23 | 9 | 55.9 | 42.7 |
| * The sound level of the measurement does not exceed the background noise level | ||||||||||
| Calculation of annual efficiency: | ||
| Exhaust air temperature: | -18.2 °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: | 4904 kWh | |
| Total energy consumption for ventilation | 1447 kWh | |
| HRV annual efficiency: | 77.2 % | |