U-values of flat and domed skylights

Conference · Fri Oct 01 00:00:00 EDT 1999

OSTI ID:775098

Klems, Joseph H

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.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Assistant Secretary for Energy Efficiency and Renewable Energy. Office of Building Technology, State and Community Programs. Office of Building Research and Standards (US)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 775098
• Report Number(s): LBNL-44422; Mo-420; R&D Project: 474712; TRN: AH200110%%85
• Resource Relation: Conference: ASHRAE 2000 Annual Meeting, Minneapolis, MN (US), 06/24/2000--06/28/2000; Other Information: PBD: 1 Oct 1999
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
SKYLIGHTS
HEAT TRANSFER
LIGHTING SYSTEMS
U VALUES
DESIGN