Working in partnership with the trusted manufacturer of renewable energy equipment Stiebel Eltron, Go Geothermal can offer full bespoke Mechanical Ventilation & Heat Recovery systems. Full designs are done in conjunction with our partners in Germany and with a range of units available virtually all applications can be catered for.
Why is ventilation so important?
For practical thermal insulation purposes, nowadays, modern homes are so airtight that virtually no energy is lost. Low energy houses in particular have an airtight building envelope primarily to prevent heat losses. This also prevents any natural air change and makes mechanical ventilation essential.
However, ventilation is also an issue in older homes. As a result of subsequent thermal insulation measures, there is often no longer an adequate supply of outdoor air through gaps and other previously air permeable spots. This creates a conflict of interest between practical thermal insulation and the need for fresh air, which can be resolved with mechanical ventilation systems.
The increasing impermeability of new buildings and modernised residential dwellings in particular, calls for a continuous air change, for example, in order to avoid the growth of mould fungus and damage to the building. However, ventilation via windows is not very practicable as the sole means of ventilation. To ensure an energy efficient and hygienic minimum air change, ventilation via windows would have to occur four to six times a day for approx. 5 minutes each time. Heating would have to be turned off and windows fully open, making this virtually impossible. Mechanical ventilation systems reliably safeguard the necessary supply of fresh air, as well as energy efficient central heating and DHW.
Sealed rooms require regular supplies of fresh air. The hourly minimum air change required is 0.4-times the room volume.
Ventilation results in the loss of approx. 50% of the heating energy through windows and infiltration. It is just like throwing money out of the window!
Air tight buildings
A tight building envelope and closely sealed windows reduce heating bills, but also greatly reduce air change rates.
Lack of ventilation increases the relative humidity indoors. The result is moisture damage and mould growth.