Heating foundations and hobs – escape of heat into the ground
Through the foundation and the base slab is running a significant amount of heat energy , because of the high heat-transfer coefficients of the concrete . In addition, it is not possible warming of foundations and underside of the support plates which is very effective thermal bridge .
This is , that the thicker and more durable the material , the greater permeability of thermal ( heat loss ) has .
We give general recommendations , which in some circumstances may be cost-effective in other irrational. Of course, we write about the ways that have a chance to earn a return or each other for many years (over 10 ) the use of home .
The first way to reduce the escape to the ground , to be considered is the foundation of the building above the groundwater level at any time of the year (preferably 0.5 – 1m) . Water and moisture significantly increases (up to 20 times the air) permeability in thermal . In addition, capillary oozing up wet the surface of the walls and floor of house , also causing significant damage and weakening of the material , fungus , mold . Dry house will be much more economical to heat in winter and cool in summer .
Another way is the foundation of the house on loose soils ( sands ) that are slightly less permeable thermal . In the case of clayey soil even the exchange of land for tens of centimeters thick sand , can give positive effects of energy .
Said the ground , of course, you need to thicken to get the required load-bearing capacity of strip footings for a foundation or foundation plate .
Houses on sandy soils are much drier due to less capillary water and moisture . Additionally, land sand are more stable in relation to the clay in particular in the case of flooding or rising ground water . Clay in these cases becomes malleable and soft which causes , that the building ” works ” , break the wall , footings , connecting to chimneys and walls switching places where there are different ground pressure .
Another way to reduce heat loss through the foundation or floor slab foundation is the use of heating ( alternative ) . Such a solution apply Nordic countries ( very far north ) where they are much more adverse weather conditions than in Poland or central Europe.
Heating foundation can be done in 2 ways:
- heating with air
- Water heating
It consists in placing in the foundation plate of pipes with a diameter of 10cm , which ultimately flows warm air from green energy sources . Unsealing tube does not matter as these air flows , and the method may operate effectively to ” end of life ” home . However, air has a much lower coefficient of heat transfer from the liquid, so the heating efficiency of such a cooling relative to the ground is too high . The tubes have a much larger diameter than the heating water which requires much thicker screed .
It consists in placing in the foundation plate , continuous footings or ground floor directly under the floor as water pipes for underfloor heating . This gives a much better effect heat transfer in relation to the air heating .
the tube is placed in a casing tube which is to limit the pressure directly on the tube .
Negatives are here factors such as mechanical damage to the pipe during installation or during operation which would lead to the use of this heat ( it is not possible repair ) . Damage to or loss of containment pipe will dampness of the baseplate which is also very negative consequences . Water pipes have a much smaller diameter than the air and can be used not only CDs but also the foundation , ceilings , stair boards and other broken concrete at home .
Heating foundations working low – temperature , at temperatures well below the under floor heating and heating the plate to room temperature will result in the reduction of heat loss to the ground by the foundation ( at a temperature difference of 0 degrees ) . Concrete and soil also has a relatively high thermal inertia , and the foundation slab heating to higher temperatures will significantly reduce outlays on heating . Heating to higher temperatures makes sense only as a storage of surplus heat , Thus, since the heating is mainly to reduce the energy to escape to the ground , rather than heating the whole house .
Cost is heating fundamentals of free energy such as . solar water or air . You should also take this into account when planning a solar heating .
For example, if you ultimately intend to use only solar water , in the plate we use water pipes and vice versa .
When water collectors , which have a very low efficiency in winter , We can switch the water flow to the foundation at a time when collectors do not give a sufficient temperature to heat water but it is sufficient to heat the foundation and its energy storage . This way you can heat the floor slab such . February when it is very low outdoor temperature ( less than – 10C) , but the sun is shining and solar work .
In addition, when traveling in the summer we have the possibility to switch of the heat from the collectors to the foundation , which protects them from damage due to lack of reception of thermal energy .
When planning such heating should not be limited to the heating of foundation . Analogously basement floor can be heated , garage , ceilings , Stair board , poured concrete walls , which will allow the storage of free energy and heat by reducing expenditures on heating energy .