Using the present software you will be able to calculate the U value (or thermal transmittance) of your PV glass system. This magnitude is important because it indicates the heat quantity that can be lost through a glazed structure. In this sense, it relates directly to energy efficiency: the lower the U value is, the greater the thermal insulation is and therefore the greater efficiency level.

In order to calculate this value, it will be required to get information about the number of simple glass layers that comprises the glazing, characteristics of the air house if applies and the characteristics of the encapsulant sheets used to laminate the glass.

There are several requirements to be considered to define the final glazing configuration, therefore availability and suitability must be checked by Onyx Solar's technical team.

Tilt

Tilt
This parameter could affect the ability to transfer heat due to convection phenomenon. In case the tilt is unknown, the vertical option must be chosen.
º
Chambers
Chambers
Gas chambers between glass layers represent the most important part of the glazing in terms of insulation. Normally air is used to fill these chambers, however other inert gases could be applied (i.e. argon gas). A single air chamber uses to be enough to provide the insulation desired, however a second double glazing could be used to further enhance insulation, especially for those regions with extreme/severe weather conditions.
Number of Chambers
0 1 2
Chamber 1
Type of gas
Air
Air
Argon
Krypton
Xenon
Thickness
mm
Emissivity – External Face
Emissivity
Low emissivity coatings (Low-e) are normally applied on the glass panes facing the air/argon chamber; they will reduce heat transmission significantly. Low-e coatings applied on both faces are not always possible and this option should be checked with our staff.

Normal Glass
Emissivity – Inner face
Normal Glass
Chamber 2
Type of gas
Air
Air
Argon
Krypton
Xenon
Thickness
mm
Emissivity – External Face
Normal Glass
Emissivity – Internal Face
Normal Glass
Glass Panes
Glass Panes
Se debe introducir aquí el número total de vidrios simples y sus espesores. Si, por ejemplo, se tiene una unidad de doble laminado, se deberán introducir dos vidrios simples y una lámina polimérica.
Number of glass panes
1 2 3 4 5 6 7 8 9 10
Glass Pane thickness 1
mm
Glass Pane thickness 2
mm
Glass Pane thickness 3
mm
Glass Pane thickness 4
mm
Glass Pane thickness 5
mm
Glass Pane thickness 6
mm
Glass Pane thickness 7
mm
Glass Pane thickness 8
mm
Glass Pane thickness 9
mm
Glass Pane thickness 10
mm
Encapsulant sheets
Encapsulant sheets
Se trata de una láminas que se coloca entre dos unidades de vidrio para unirlas, formando así un vidrio laminado. Convencionalmente, estas láminas son de EVA o PVB y permiten que, en caso de rotura, los trozos de vidrio se queden adheridos a la lámina, evitando que caigan sobre personas y produzcan daños.
Influyen poco en la capacidad de aislamiento térmico, por lo que si no se conoce su espesor puede dejarse el valor por defecto sin que esto suponga un error significativo.
Number of encapsulant sheets
0 1 2 3 4 5 6 7 8 9 10
Encapsulant sheet thickness 1
mm
Encapsulant sheet thickness 2
mm
Encapsulant sheet thickness 3
mm
Encapsulant sheet thickness 4
mm
Encapsulant sheet thickness 5
mm
Encapsulant sheet thickness 6
mm
Encapsulant sheet thickness 7
mm
Encapsulant sheet thickness 8
mm
Encapsulant sheet thickness 9
mm
Encapsulant sheet thickness 10
mm
Calculate

Results

Results
Here you can see several magnitudes among which the thermal transmittance (U value) is the most important one.

Values in green, blue and orange represent the thermal resistance of each glazing component (chamber, glass panes and encapsulant sheets). They are inverse values, so higher values mean a better thermal insulation. Normally, the highest value corresponds to the chamber.

Custom values.