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VDI 4608 Blatt 2 Energy systems - Combined heat and power - Allocation and evaluation

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German title
Energiesysteme - Kraft-Wärme-Kopplung - Allokation und Bewertung
Publication date
2008-07
Publisher
Engl. VDI-Gesellschaft Energie und Umwelt
Related manuals
Number of pages
71
Available in
German, English
Abstract

The aim of this guideline, which follows on from the definitions and examples provided in VDI 4608 Part 1, is to evaluate the efficiency of the combined generation or conversion of different target energies and to present different allocation methods, in conjunction with a recommendation for a scientifically based procedure. In practice total costs have until now frequently been apportioned to the target products by the remainder value method. The present guideline proposes a differentiated procedure for this: It is recommended that the exergy loss method [1 to 3] be applied for allocating the primary energy, emissions and variable costs to the target energies. As regards allocation of fixed costs, it is recommended, in the event that a straightforward assignment is not possible, that apportionment be based on the ratio of plant costs at the time of investment in the reference plants and supplying heat and power.

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