Thermal bridges : a noncomputerized calculation procedure
(1986) Abstract
 This study presents a noncomputerized calculation procedure for steady state twodimensional conductive heat losses through thermal bridges. The heat flow is divided into distinct flow paths based on physical considerations. A resistance is derived analytically for each flow path. These resistances are combined into a net work. The network simulates the construction. Calculating the total resistance of the network gives the thermal resistance of the construction. The algorithm is compared with a finite forward difference method. The relative error on the linear thermal transmittance of the thermal bridges calculated does not exceed 10%. The absolute error on the mean surface temperature is approximately 1°C and independent of the type of... (More)
 This study presents a noncomputerized calculation procedure for steady state twodimensional conductive heat losses through thermal bridges. The heat flow is divided into distinct flow paths based on physical considerations. A resistance is derived analytically for each flow path. These resistances are combined into a net work. The network simulates the construction. Calculating the total resistance of the network gives the thermal resistance of the construction. The algorithm is compared with a finite forward difference method. The relative error on the linear thermal transmittance of the thermal bridges calculated does not exceed 10%. The absolute error on the mean surface temperature is approximately 1°C and independent of the type of construction. The minimum inside surface temperature can be estimated in only a few cases; the absolute error is approximately 0.5°C. The algorithm is devel oped mainly for designers. Its simplicity and the possibility it offers for quick and ac curate control calculations makes it an ideal design tool. It can be programmed in Lotus for specific applications of a designer. It is ideal for prevention of condensa tion, more so than predicting heat loss (or gain). (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/record/8054454
 author
 Staelens, Peter
 supervisor
 publishing date
 1986
 type
 Thesis
 publication status
 published
 subject
 keywords
 värmeflöden, köldbryggor, beräkningsmetoder
 pages
 146 pages
 publisher
 Byggnadsfysik LTH, Lunds Tekniska Högskola
 external identifiers

 other:TVBH3011
 language
 English
 LU publication?
 no
 additional info
 Licentiatuppsatsen som avslutades på Avd Husbyggnadsteknik vid Chalmers, presenterades den 19 februari 1988.
 id
 6c3c414aba5b4c928e57a07c551f489b (old id 8054454)
 date added to LUP
 20160401 15:24:39
 date last changed
 20181121 20:34:17
@misc{6c3c414aba5b4c928e57a07c551f489b, abstract = {This study presents a noncomputerized calculation procedure for steady state twodimensional conductive heat losses through thermal bridges. The heat flow is divided into distinct flow paths based on physical considerations. A resistance is derived analytically for each flow path. These resistances are combined into a net work. The network simulates the construction. Calculating the total resistance of the network gives the thermal resistance of the construction. The algorithm is compared with a finite forward difference method. The relative error on the linear thermal transmittance of the thermal bridges calculated does not exceed 10%. The absolute error on the mean surface temperature is approximately 1°C and independent of the type of construction. The minimum inside surface temperature can be estimated in only a few cases; the absolute error is approximately 0.5°C. The algorithm is devel oped mainly for designers. Its simplicity and the possibility it offers for quick and ac curate control calculations makes it an ideal design tool. It can be programmed in Lotus for specific applications of a designer. It is ideal for prevention of condensa tion, more so than predicting heat loss (or gain).}, author = {Staelens, Peter}, language = {eng}, note = {Licentiate Thesis}, publisher = {Byggnadsfysik LTH, Lunds Tekniska Högskola}, title = {Thermal bridges : a noncomputerized calculation procedure}, year = {1986}, }