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Underfloor heating


Since the floor cover basically affects selection of heating surface following the calculation of the required heat, it is necessary to go into its heat feeling in details.

Let’s set out from the floor cover, it is basically definitive when deciding to have underfloor heating in the room or not. It affects considerably the size of the surface in addition to floor that could be necessary for heating respectively for cooling. This is the key topic to speak about since the most of heat feeling problems might be attributed to it.
On basis of their heat absorption coefficient the floors can be classified as follows (according to extinct standard MSZ 04-140-2):

  • warm floor: b < 0.700
  • half warm floor: 0.700 < b > 0.840
  • cold floor: b > 0.840

 

The “b” heat absorption coefficients of the different floor covers are indicated in chart No. 2.2.2.2-a:

 

Burkolat anyaga

Hőelnyelési tényező "b"

Padló besorolása

márvány

3

hideg

beton

1.5

hideg

csempe

1.26

hideg

linoleum

1

hideg

parketta

0.5

meleg

parafa

0.1

meleg


2.2.2.2-a Táblázat

 

Heat feeling requirements to floor quality:

  • dwelling room, hospital ward, day nursery, nursery school and other similar rooms and spaces of high thermal demand: „warm”
  • office, theater, etc. and other workshops where the workers are staying long-lasting in one place: „half warm” at least
  • in lavatories and other similar places, industrial workshops in general, depots, sub-space, etc. „cold” is permissible

 

 

When the client in lack of knowledge of directions or simply due to his demand does not want to meet these instructions and according to his own conception, insists on cold floor i.e. in the living room (aesthetics, easy-to-clean, abrasion resistance), it is expedient to construct underfloor heating, otherwise he will face the fact of unpleasant heat feeling.
Health problems may arise from inadequate floor surface temperature depending that it is either too warm or too cold:

  • in case of unheated cold floor: cold heat feeling and rheumatic problems.
    To protect, the temperate floor heating of constant surface temperature is advisable.
  • in case of overheating the floor surface: hot heat feeling and circulatory disturbances.
    To protect, planning and designing based on medical and technical heat feeling surveys, considering the instructions for surface temperature, respectively scheduled implementation and control are advisable. Limitation of the surface temperature will, at the same time, involve the accessible W/m2 value of specific efficiency.

Through the application of underfloor heating the required heat can be technically granted in all probability. Planning of a potential additional wall heating necessitates the special approval and decision of both the client and designer.

The control is based generally on keeping the adjusted value of the room temperature constant. In the transition period (in autumn and spring) there is often no need of underfloor heating, so the heat feeling can be changed.

Due to the changing heat feeling the occurrence of the relating problem is more intensive in spring and less intensive in autumn owing to inertia of the floor surface respectively of heat control of the room when the floor surface becomes cold. This is because we get less dressed in autumn than in spring in the open air – the same way changes our heat feeling also within the house. This problem can be eliminated by underfloor heating of constant surface temperature.

Floor cooling

This is perhaps the most controversial solution from among the surface heating/cooling systems.

A well designed and constructed floor heating will never result in worse state than it would otherwise occur by itself, too. Not the system but the selection of cold floor is responsible for cold feeling.
The floor cooling is mainly applicable when the floor surface (either due to heat technical or heat feeling reasons) is considered at the heating; it means pipes are laid in the floor. We must not leave this possibility unexploited since we can reach significant cooling efficiency, maybe, not in a great extent, but due to the large surface with a smaller specific cooling efficiency. The client can reduce the investments costs this way, because otherwise the cooling would need further built-in surfaces.