01115nas a2200121   4500008004100000245004100041210004000082260003600122490001600158520072200174100002200896856007500918       2000                        eng d00aU-Values of Flat and Domed Skylights0 aUValues of Flat and Domed Skylights  aMinneapolis, Minnesotac06/20000 v106, Part 23 a<p>Data from nighttime measurements of the net heat flow through several types of skylights is presented. A well-known thermal test facility was reconfigured to measure the net heat flow through the bottom of a skylight/light well combination. Use of this data to determine the U-factor of the skylight is considerably more complicated than the analogous problem of a vertical fenestration contained in a test mask. Correction of the data for heat flow through the skylight well surfaces and evidence for the nature of the heat transfer between the skylight and the bottom of the well is discussed. The resulting measured U-values are presented and compared with calculations using the WINDOW4 and THERM programs.</p>1 aKlems, Joseph, H.  uhttps://facades.lbl.gov/publications/u-values-flat-and-domed-skylights