Grym
2016-09-01 12:24:19
- #1
Sorry, but that is completely wrong. That’s why the calculation.Without considering the inventory, in a 150m² house with a ceiling height of 2.70m, you have about 400m³ of air. With 225m³ circulation and taking the inventory into account, you exchange the air roughly every 1.5 hours and increase the temperature each time by 0.5-1°
Heat or cold is stored in the building components and not in the air. You have to calculate energy input. In such great houses, which are heated with air-to-air heat pumps, the air is partly blown in at 50 degrees and more, and at significantly higher volumes per hour. Nevertheless, people have problems getting the place warm. Even KfW40 or KfW55 houses. It is not like the entire air is exchanged after half an hour and suddenly it’s 50 degrees in the room.
For comparison, the energy input of a south-facing window irradiated by the sun, direct and diffuse radiation, about 1kW/m² (of which 650-700 watts direct and the rest diffuse radiation). 2.00 meters by 2.30 meters = 4.6m² = 4.6kW. Of this, triple glazing lets through 55 percent, so 2.53kW.
Controlled ventilation living room: 0.0136 kW
South-facing window living room: 2.53 kW
Running controlled ventilation for one hour: 0.0136 kWh energy input
An unshaded single south-facing window for 19.35 seconds: 0.0136 kWh energy input
Conclusion: The controlled ventilation with heat recovery has no noticeable heat input. The waste heat from 3 LEDs with 5.5 watts each is higher than the energy input of the controlled ventilation.