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Temperatures of two glazed roofs; Laempoetilat kahdessa valokatossa

Technical Report:

Abstract

The purpose of the study was to determine temperature variations in glazed roofs. Temperatures were measured in two buildings: the offices of Lasitukku Oy and the Siuntion Kylpylae bathing establishment of special interest were temperature differences between day and night, maximum and minimum temperatures, temperature distributions in the roof, maximum heating and cooling rate, and occurance of water vapour condensation on inner or outer surfaces. The results showed the maximum temperature difference between day and night to be 50 deg C and maximum temperature variations during the time of measurement 80 deg C. The maximum temperature of the outer surface was 66 deg C and the minimum temperature -22 deg C. Metallic roofs parts were of equal temperature +- deg C in both winter and summer. Maximum heating rates of outer surfaces were 10-13 deg C/h and minimum cooling rates 15-25 deg C/h. No water condensation was observed on either surfaces of the roofs. In Lasitukku Oy the roof glass is a sealed double-pane unit, the inner pane being electrically heated. This minimizes the risk of condensation At Siuntion Kylpylae the roof glass is a sealed triple-pane unit In Siuntion Kylpylae condensation would have occurred during the coldest night according  More>>
Authors:
Hemmilae, K [1] 
  1. Technical Research Centre of Finland, Espoo (Finland). Building Materials Lab.
Publication Date:
Dec 31, 1992
Product Type:
Technical Report
Report Number:
VTT-TIED-1380
Reference Number:
SCA: 320107; PA: FI-92:003441; SN: 93000918050
Resource Relation:
Other Information: PBD: 1992
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; ROOFS; GLAZING; GLASS; TEMPERATURE DISTRIBUTION; TEMPERATURE DEPENDENCE; THERMAL EXPANSION; OFFICE BUILDINGS; FIELD TESTS; SEASONS; 320107; BUILDING SYSTEMS
OSTI ID:
10111581
Research Organizations:
Technical Research Centre of Finland, Espoo (Finland)
Country of Origin:
Finland
Language:
Finnish
Other Identifying Numbers:
Other: ON: DE93752868; ISBN 951-38-4193-6; TRN: FI9203441
Availability:
OSTI; NTIS
Submitting Site:
FI
Size:
50 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Hemmilae, K. Temperatures of two glazed roofs; Laempoetilat kahdessa valokatossa. Finland: N. p., 1992. Web.
Hemmilae, K. Temperatures of two glazed roofs; Laempoetilat kahdessa valokatossa. Finland.
Hemmilae, K. 1992. "Temperatures of two glazed roofs; Laempoetilat kahdessa valokatossa." Finland.
@misc{etde_10111581,
title = {Temperatures of two glazed roofs; Laempoetilat kahdessa valokatossa}
author = {Hemmilae, K}
abstractNote = {The purpose of the study was to determine temperature variations in glazed roofs. Temperatures were measured in two buildings: the offices of Lasitukku Oy and the Siuntion Kylpylae bathing establishment of special interest were temperature differences between day and night, maximum and minimum temperatures, temperature distributions in the roof, maximum heating and cooling rate, and occurance of water vapour condensation on inner or outer surfaces. The results showed the maximum temperature difference between day and night to be 50 deg C and maximum temperature variations during the time of measurement 80 deg C. The maximum temperature of the outer surface was 66 deg C and the minimum temperature -22 deg C. Metallic roofs parts were of equal temperature +- deg C in both winter and summer. Maximum heating rates of outer surfaces were 10-13 deg C/h and minimum cooling rates 15-25 deg C/h. No water condensation was observed on either surfaces of the roofs. In Lasitukku Oy the roof glass is a sealed double-pane unit, the inner pane being electrically heated. This minimizes the risk of condensation At Siuntion Kylpylae the roof glass is a sealed triple-pane unit In Siuntion Kylpylae condensation would have occurred during the coldest night according to calculations if the relative humidity of the inside air had been 35 % or more. Unequal heating and different thermal expansion coefficients of materials cause bending and stresses in the glass, frames and sealings. Temperature differences between the edge and middle of the glass pane causes stresses in the glass. Temperature variations of a sealed glass unit cause variation in pressure, giving rise to stress in the edge sealing compound and shortening the life of the sealed glass unit. High temperatures, major temperature difference between night and day, and high cooling and heating rates cause stresses in sealing compounds and weather strips, and were the most important stress factors observed in this study.}
place = {Finland}
year = {1992}
month = {Dec}
}