This is defined as the condition of total psychophysical satisfaction of a person with regards to the environment that he is in.

ASSESSMENT OF THERMAL COMFORT OF WINDOWS

At the moment two models exist in order to assess thermal comfort, both recognised by current norms.

1. The studies-experiments carried out by the Danish P. Ole Fanger (recognised in the norm EN ISO 7730 and in ASHRAE 55 Standard 2004);
2. Another theory, known as the Adaptive method, (recognised in the norm EN 15251 and in ASHRAE 55 Standard 2004).

The models may co-exist: normally the second model is used for non-climatised environments, so-called free running.

From an analysis of the FANGER method (first model) and the norm EN ISO 7730, it can be seen that the FEELING OF THERMOHYGROMETRIC COMFORT DOES NOT DEPEND ON THE EXTERNAL CLIMATE.

Fanger developed a comfort model based on the following parameters:

• Air temperature
• Radiant temperature
• Relative humidity
• Air speed
• Type of activity
• Thermal resistance of clothing

The model is based on the thermal balance of the human body, or the energy exchanges between the body and the surrounding environment.

If you are interested in learning more about the balance equation, the factors that form it or anything else, please send an email to  web@nurith.it.

We must remind you that the conditions of thermohygrometric wellness are:

WINTER: To = 20-24°C; Ur = 30-70%

SUMMER: To = 23-26 °C; Ur = 30-70%

Where: To = Operative temperature; Ur = Relative humidity

In order to guarantee thermohygrometric wellness, a good window is required.  It must be able to guarantee control of the passage of air, light, noise, excessive heat and excessive cold, smells, rain and insects.  This is why NURITH is constantly carrying out technological innovation, searching for new instruments in order to guarantee thermohygrometric wellness.

Parameters of asessment are: thermal insulation and acoustic insulation.

The THERMAL INSULATION of a window depends on the material of the frame, the type of glass and the type of conduit.  The index ncessary to understand the level of a window is "U" (themal transmittance) and it is the flow of average heat (in terms of square metre of the surface) that passes through a structure that divides two environments at different temperatures.

The lower the index, the better the level of insulation of the window is (Uw is the general thermal transmittance of a window). Apart from this index, sealing against water, air and wind pressure is important.  These indexes are identified through the allocation of classes deriving from our laboratory tests.

The THERMAL INSULATION of a window is critical in terms of the different materials used for the components.  Each one of them should be individually performing: glass, frame, counterframe and brickwork.  The numbers indicated before the dB (decibel) indicate the sound-insulation R power of the window, therefore the difference between the sound level that a partition can maintain between the disturbing environment and the receiving one.  The higher the index, the better the insulating features of the window are.

The values achieved through the tests with our windows “Domus” and “Pr1ma" are:

• Thermal insulation Uw up to 0,80 W/m²K (with suitable glass)
• Acoustic insulation up to 40 dB (with suitable glas)

For further information please visit the section Windows.

Furthermore NURITH is more and more ecosustainable.  Our windows have reduced maintenance costs, they contribute to energy savings and therefore protect resources.

Creative commons - Attribution FINESTRE NURITH.