U-value
Heat transfer coefficient
U-value is a measure of how well heat passes through a material or building component—the lower the number, the better the insulation.
Windows, walls, and doors are rated by U-value to indicate energy efficiency: Double-pane windows have a much lower U-value than single-pane.
The term appears in building codes and energy assessments.
The opposite measure is R-value, which rates resistance to heat flow.
building-standards
Green architecture certification
- complianceAdhering to requirements
- certificationAttestation of qualification
- fenestrationPlacement of openings
- retrofittingUpdating existing with new
materials
Reinforced woven strand composite
- polystyreneLightweight synthetic foam plastic
- polyurethaneVersatile synthetic resin compound
- cellulosePlant wall polysaccharide
- double-glazingTwo-layered window glass
LEED
Green architecture certification
- complianceAdhering to requirements
- certificationAttestation of qualification
- fenestrationPlacement of openings
fiberglass
Reinforced woven strand composite
- polystyreneLightweight synthetic foam plastic
- polyurethaneVersatile synthetic resin compound
- cellulosePlant wall polysaccharide
double-glazing · weatherstripping · aerogel · timber-frame · cladding
conductivity
Ability to carry current
- steady-stateCondition of constant balance
- unitsunit, angstrom, yard, meter, base units
- HVACair conditioner, furnaces, furnace, ductwork, central air
- heat transferconduction, convection, heat flow, heat transfer, conductors
- heatingfurnace, boiler, baseboard heaters, radiator, heat pump
- Electrical Unitswatt, ampere, volt, coulomb, ohm
- Heat lossheat transfer, heat dissipation, conduction, convection, radiation