Glossary · U
U-Value (Thermal Transmittance)
A measure of how much heat passes through a wall, roof or window, where a lower figure means better insulation.
What is U-Value (Thermal Transmittance)?
A U-value is the rate of heat transfer through a structure, such as a wall or a glass window, divided by the temperature difference across it. It is also called thermal transmittance and is measured in W/m²K. A lower U-value means better insulation. In the hot Indian climate, a low U-value cuts the electricity that air conditioning uses.
Practical example
An architect designing a luxury hotel in Dubai or Delhi rejects standard single-pane glass, which has a U-value of 5.8 and lets a large amount of heat in. The architect specifies a double glazed unit (DGU) with a Low-E coating instead, which brings the U-value down to 1.8, keeps the interior cooler and cuts the HVAC electricity bill.
In SuperWise
In SuperWise a U-value requirement can be written in the specifications of an RFQ line and again on the purchase order line, where it prints on the PO. A resource such as facade glass can also carry a quality checklist that the site team fills at delivery, with number and photo fields for the rated value on the manufacturer's data sheet.
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