Clear Tempered Single Pane Low E Glass. U – Value is the rate of heat transfer or heat loss. The heat transfer coefficient Uw relates to the entire window.
This value also incorporates the U – values for the glazing and the frame Uf. The table shows the relevant data for windows with wood and PVC- U frames, and highlights the . The means of rating the thermal performance of building products is the “ U Value ” or “R Value”.
The R Value is the value of the thermal resistance . The following chart is an extract from the performance data table. The information is for the standard. U Value – measurement unit is watts per mper degree. The U – value of a window is a measurement of the rate of heat loss indicating how well your windows are keeping valuable heat in.
It is expressed as Watts per . When we talk of heat loss, it is normally quoted as U value. Please remember the U value quoted for glass can be quite different than the overall U value for a window , but the lower the U value the lower. See the graph below for further detail:.