- A perfect indoor climate - once and for all
- How to discover problems with the indoor climate
- Causes of indoor air problems
- Health and well-being with home ventilation
A perfect indoor climate with home ventilation
- Heat recovery ventilation units - how it works
- Which size of home ventilation unit?
- Installation and dimensioning
- Vertical and horizontal models
- It is so easy with Dantherm home ventilation
- Energy conservation with Dantherm heat recovery ventilation unit
- Approvals and certificates
- Wide range of accessories
- Case stories - home ventilation
- Heat recovery home ventilation - product descriptions
- Connection to Building Management System
Energy conservation with Dantherm
heat recovery ventilation unit
Energy calculation - what
is the net energy saving with a home ventilation
A sound indoor environment is important. So is the global environment. With a heat recovery ventilation unit from Dantherm you will get a solution that saves energy, provides a pleasant indoor environment and contributes to reduced CO2 emissions. Dantherm heat recovery ventilation units are fitted with highly efficient heat exchangers recovering up to 95% of the heat from the exhaust air.
In order to calculate the net saving with a heat recovery ventilation unit, we must take into account the energy consumption for heating and electricity, as the home ventilation unit uses electricity and at the same time it reduces the heating demand of the house.
Below we have made a calculation where we compare the consumption in a new-build house (constructed in accordance with the latest building regulations) with mechanical heat recovery ventilation, with the consumption in a house with traditional ventilation. As it appears, there is a nice saving on the total energy consumption.
Energy balance sheet - example
A tight and insulated detached house of 140 m2 is fitted with a mechanical heat recovery ventilation system with counterflow heat exchanger. The ventilation unit has a heat recovery of 80% and SFP of 1000 J/m3. The house is a standard one-storey detached house with utility room, a kitchen, a bathroom and a toilet.
|Annual energy conservation in kWh||
Gas consump. heating
of ventilated air
|Annual cost reduction in
consump. converted to m3 gas
Cost reduction gas*
Electricity costs** for running of the ventilation system
Cost reduction in DKK
kWh/year / 11 kWh/m3 =
9,25 kr./m3 x 520 m3=
2,25 kr./kWh x 520 kWh =
4.810 DKK - 1.170 DKK =
* Natural gas price: 9,25 DKK pr. m3 ** Electricity price: 2,25 DKK pr. kWh
Source: Danish "Videncenter for energibesparelser".
1 liter fuel = 8-10 kWh. 1 m3 natural gas = 9-11 kWh, (highest for new boilers).
CO2-emissions for various kinds of heating:
- Natural gas: 0,205 kg CO2 pr. kWh
- Fuel oil: 0,265 kg CO2 pr. kWh
- District heating: 0,122 kg CO2 pr. kWh
- Electricity: 0,478 kg CO2 pr. kWh