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 Source: Schott Solar AG |
The "U" thermal transmittance coefficient is the measurement unit for determining the loss of heat in a building element. It expresses the quantity of heat which crosses a square metre of a building element per second for a temperature difference of 1°C between internal and external air. The lower the value, the higher the thermal insulation. Typical values vary between 6W/m2K for a simple glass window to 1W/m2K for a double glazed low emission window. |
Photovoltaic product from Ertex Solar with information on the "U" value
Source: Ertex Solar
Comparison of the heat transmittance coefficient for different glazing configurations and a double glazed photovoltaic module (a-Si)
| U-value (EN673) [W/m2K] |
|
| Single glass pane or laminated glass | 5.6 |
| Double glazed unit without low-e coating | 2.7 |
| Double glazed unit with low-e coating | 1.2 |
| ASI THRU double glazed unit | 1.2 |
| sc-Si photovoltaic module with insulated glazing | 1.1 |
| a-Si/a-Si photovoltaic module with insulated glazing | 1.1 |
| a-Si photovoltaic module with insulated glazing | 1.2 |
| Micromorph photovoltaic module with insulated glazing | 1.2 |
Source: Schott Solar AG & ISAAC-SUPSI
Examples of thermal transmittance values as a function of the specific characteristics of an integrated photovoltaic module fro transparent roofs and facades
Source: Ertex Solar