The aim of this bachelor thesis is to determine how large, depending on air velocity and temperature, the heat
transfer coefficient on a vertical wall with forced convection is. The determined heat transfer coefficients
should serve the test bench, which examines the age resistance of a compact facade from the company
swisspor. The calculation of the heat transfer coefficient is dependent on the air velocity, as well as
temperature, which creates a law describing the coefficient regarding air velocity and temperature. But since
the calculation or creation of such a law is not trivial, an ingenious method is required to formulate it.
In order to create this law, the basics of the area heat transfer through materials had to be investigated, which
enabled the development of the calculation process. Additionally, a lot of research on already existing
formulas describing the heat transfer coefficient’s magnitude, was conducted, giving an overview of the law’s
range. Using calculations and literature, a law between the heat transfer coefficient and the air velocity can be
formulated. The integration of temperature in this law was neglected, due to metrological reasons. The result
is a formula describing the heat transfer coefficient in dependence of air velocity.
With the help of this formula, which is also referred to as the Nusselt-Formula, it is possible to calculate
relevant heat transfer coefficients for the test bench. Further, there is the possibility to include this formula in
other simulation programs, which enhances the accuracy of the compact facade’s thermal behaviour and thus,
enables more precise statements about the resistance of that facade.
(Abstract deutsch fehlt)
Kqiku Blerant, Hochschule Luzern - Departement Technik & Architektur