ISO 10211:2017 pdf free

ISO 10211:2017 pdf free.Thermal bridges in building construction一Heat flows and surface temperatures
The temperature distribution within, and the heat flow through, a construction can be calculated if the boundary conditions and constructional details are known. For this purpose, the geometrical model is divided into a number of adjacent material cells, each with a homogeneous thermal conductivity. The criteria which shall be met when constructing the model are given in Clause 7.
In Clause 8, instructions are given for the determination of the values of thermal conductivity and boundary conditions.
The temperature distribution is determined either by means of an iterative calculation or by a direct solution technique, after which the temperature distribution within the material cells is determined by interpolation. The calculation rules and the method of determining the temperature distribution are described in Clause 9.
NOTE Specific procedures for window frames are given in ISO 10077-2.
It is not usually feasible to model a complete building using a single geometrical model. In most cases,the building is partitioned into several parts (including the subsoil, where appropriate) by using cut-off planes. This partitioning shall be performed in such a way that all differences are avoided in the results of calculation between the partitioned building and the building when treated as a whole. This partitioning into several geometrical models is achieved by choosing suitable cut-off planes.
For two-dimensional calculations, there is a vertical symmetry plane in the middle of the floor (so that one half of the building is modelled). For three-dimensional calculations on a rectangular building,vertical adiabatic boundaries are taken in the ground mid-way across the floor in each direction (so that one quarter of the building is modelled). For non-rectangular buildings, it is necessary either to model the complete building (together with the ground on all sides), or to convert the problem to a two-dimensional one using a building of infinite length and of width equal to the characteristic dimension of the floor, B (see ISO 13370).ISO 10211 pdf download.