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Simplified approaches for initial assessment of cost efficiency

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Normally, for initial prestudies a detailed assessment of cost-effectiveness of investments are not necessary. Several simplified approaches allow a reliable conclusion at least in those cases, when the results clearly tend either to "cost efficient" or to "not cost efficient".

The following tools for simplified approaches are presented under this menu item:

Based on empiric studies, the probable costs of typical measures can be expressed as a cost function using suitable parameters, e. g. the costs of a thermal insulation of an exterior wall dependent of the intended heat transmission coefficient.

For the examples of modernisation given in this section, a presentation in form of a matrix is applied to determine the equivalent energy price, above which a certain measure is cost efficient. This approach is applicable under certain typical boundary conditions. For this purpose, the overall investment costs must be known as well as the portion of costs assigned to the maintenance or other not energy related inducements.

Cost functions and energy price matrices for specific measures are given with the respective examples of modernisation; their application is explained in that context.

Several institutions offer on their websites modernisation guides that – among other features – help to assess the cost effectiveness of modernisation measures. In the background, these tools also use simplified approaches, but their mode of function and the reliability of results are not always transparent. Three guides that are usable free of charge are presented here.

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