EN 1745 Masonry. Methods for determining design thermal values

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EN 1745:2002 Masonry and masonry products - Methods for determining design thermal values

Size: 0.61 MB | Format: PDF | Publisher: CEN | Year: 2002 | pages: 65

This standard provides rules for the determination of design values for thermal conductivity and thermal resistance of both masonry and masonry products.

It also describes how the basic values for the calculation of design thermal values are determined and also the calculation methods to derive design values from basic values. It covers solid masonry units (clauses 4 and 5) and masonry units with formed voids and composite masonry units (clause 6).

Three procedures for the determination of thermal resistance and/or thermal conductivity are described. These procedures are:
- To use tabulated lambda - and/or R-values.
- To measure the lambda - and/or R-value.
- To calculate the equivalent lambda - and/or R-value.

It takes into account the major different types of masonry products:
- Solid masonry units.
- Masonry units with formed voids.
- Composite masonry units.

The design value of a product characteristic is the value determined for specific application and for use in calculations.

Design thermal values are determined, according to the procedure given in this standard by the user/designer and building authority according to the intended application, environmental and climatic conditions, bearing in mind the purpose of this determination, such as:
- energy consumption;
- design of heating and cooling equipment;
- surface temperature determination;
- compliance with national building codes;
- consideration of non steady state thermal conditions in buildings.

A specific building product can have different design thermal values according to the intended application. Normally the producers/distributors will supply design values for their products.

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