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.
BT - 2000 ASHRAE Annual Meeting C1 -Windows and Daylighting Group
C2 - LBNL-44422 CY - Minneapolis, Minnesota DA - 06/2000 LA - eng N2 -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.
PP - Minneapolis, Minnesota PY - 2000 T2 - 2000 ASHRAE Annual Meeting T3 - 2000 ASHRAE Annual Meeting TI - U-Values of Flat and Domed Skylights VL - 106, Part 2 ER -