SYMPOSIA PAPER Published: 01 January 1990

A Survey of Window -Value Measurements in Sweden (1977–1987)


At the Swedish National Testing Institute (SP) window thermal transmittance (U-value) measurements are carried out in a Guarded Hot Box (GHB). It is shown that the GHB meets the requirements of the relevant Swedish Standard (SS 024212,13) and International Standard Draft Proposal (ISO/DP 8990). The SS 024213 measurement routines are discussed.

A survey of measurement results acquired during the last ten years shows the continuous improvement of the U-value of windows produced in Sweden as well as the increasing importance of additional panes and improved sealed glazing units.

By way of comparative Guarded Hot Plate (GHP) and GHB measurements on sealed glazing units it is shown that the GHP method should be examined thoroughly and its results handled with care in order to prevent misinterpretation by, for instance, the client. It is further noted that the GHB technique, although commonly used, is not completely investigated and that on the level of standardization much work is yet unfinished.

Author Information

Staelens, P
Swedish National Testing Institute, Borås, Sweden
Price: $25.00
Contact Sales
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Developed by Committee: C16
Pages: 421–436
DOI: 10.1520/STP23321S
ISBN-EB: 978-0-8031-5109-3
ISBN-13: 978-0-8031-1278-0