Few studies have addressed the need for new testing standards for the determination of the SHGC, U-factor
, and electrical performance of STPV systems (and building integrated photovoltaic technologies in general).
Also, the windows selected were high performance, having a total unit performance U-factor
With a good U-factor
and SHGC, Solarban 70XL glass also reduced the chance that the space will overheat, which is very important in our naturally cooled space.
Which of the following statements about U-factor
and R-value are true?
The glass is a high performance Softcoat Low Emissivity (Low E) glass to achieve a lower U-factor
(heat loss/gain) or Solar Heat Gain Coefficient (SHGC) The glass is sprayed with a coating of metal oxide particles that produce a higher heat reflectance.
For instance, requirements associated with building envelope assemblies have evolved from a single overall average U-factor
to specific requirements for each product or material used in each building envelope component.
The thermal models for the prediction of the U-factor
were compared with the measurement data taken from the certified product directory database of the National Fenestration Rating Council (NFRC) and CFD simulations.
Alpen High Performance products 9H and L series windows, averaging U-factor
The curtainwall provides enhanced condensation performance and tow U-Factor
, along with panoramic, floor-to-ceiling views.
rating measures the efficiency of the windows.
Specific guidelines for U-factor
and solar heat gain coefficient (SHGC) of replacement glass; minimum R-values for insulation; exemptions for lighting replacements of less than 50% of a space, as well as bulb and ballast-only lighting alterations, so long as these don't result in increased power consumption; and requirements for door and roof replacements, as to when additional insulation is mandated, and when it is not.
The National Fenestration Rating Council is a good first stop, since o it rates windows on factors like air leakage and offers a U-factor
measurement of how well the window guards against heat loss.