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What is the thermal comfort?

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What is the thermic comfort?

"Not to feel too cold or too hot, not to feel unpleasant streams of air"

The human body mentains its heat at a temperature close to 37 degrees C thanks to he contribution of calories from aliments and to a sum of biological elements. It permanently exchanges heat with the neighboring enviroment.
In order to have thermic confort in your house the materials need to respect the following qualities:

INSULATION = reduction of the quantity of heat which crosses the wall, the purpose is to minimize the energetic consumption.
Feature size: thermic resistance (m2K/W)

ACCUMULATION = Capacity of the material to accumulate then return the heat in winter and the coolness in summer (for a certain volume): that is to adjust the variations of internal temperature.
Feature size: thermic capacity on surface (that is inertia) (Wh/m2K)

AMORTISATION = Abiliy of the wall to atenuate the variations of the external temperature during a day.

PHASE DISPLACEMENT = the variations of external temperature consitute a wave. Phase displacement represents the time necessary to this wave to cross the wall.
Feature size: atenuation and the transfer time (the two sizes being correlated).

In order to make an analysis over the different types of external walls we define the three types of thermic confort:

Winter confort: ability of the house to offer to its occupants a pleasant temperature in winter with a shorter time of heating.

Confort in half season : ability of the house to preserve a stable temperature for its occupants to diminish the time of heating.

Summer confort : ability of the house to remain cool in summer without air conditioning.

We present you in the below tables the structures of the walls and the values of the coeficients of the thermic transfer "U", for the different solutions of assembly of the walls.
Each value has been transformed in marks on 100, so that the best structure of the wall obtains 100/100

Heat loss of a building transmission through walls and windows are characterized by the coefficient of heat loss through the walls and ceiling of the building, called "U", expressed in W / (mē K), and determined the calculation Th-CE.

Conclusions due to calculus:
- the thermic transfer coefficinet U must be inferior to:
0,45 for the exterior walls
0,40 for a floor crawlspace
2,6 for windows and terrace doors.

We present you, in the following tables, the correspondence between the exterior wall structure and the values of the thermal comfort for the different wall solutions that our company produce .
Each value was converted in notes from 1 to 100 so that the best wall structure, regarding the comfort, receive the note 100.

- The calculations for the values below presented are made for the following materials :
- Wood - dried spruce of 14% +/- 2%
o Volumetric mass = 480 Kg/m3
o Specific heat = 0,76 Wh/kg.K
o Thermal conductivity lambda = 0,12 W/m.K
- Mineral wool insulation (rolls)
o Volumetric mass = 25 Kg/m3
o Specific heat = 0,26 Wh/kg.K
o Thermal conductivity lambda = 0,037 W/m.K

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