Measurement of Single and Double Glazing Thermal Performance under Realistic Conditions Using The Mobile Window Thermal Test (MoWITT) Facility

TitleMeasurement of Single and Double Glazing Thermal Performance under Realistic Conditions Using The Mobile Window Thermal Test (MoWITT) Facility
Publication TypeConference Paper
Year of Publication1986
AuthorsJoseph H Klems, H. Keller
Conference Name1987 ASME Solar Energy Division Conference
Date Published03/1987
Conference LocationHonolulu, HI
Call NumberLBL-22149
Abstract

The thermal performance of single glazing, clear double glazing, and double glazing with a low-emissivity coating was measured in both south-facing and north-facing orientations under realistic field conditions using the new MoWiTT field test facility. The time-dependent net heat flow through each fenestration was found to be consistent with the predictions of the standard simplified heat transfer model, provided that an angle-dependent shading coefficient is used and diffuse solar gain is included in the calculation. Summer-condition average U-values were derived for each glazing type and were found to agree with the expected values for both types of double glazing. The measured U-value for single glazing was lower than predicted.

LBNL Report Number

LBL-22149