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Executive Summary 3-10 Modelling calculations and economic models 3 Modelling calculations and economic models The Task 2 Report intended to outline how the integration of IHP in processes is sup- ported by computer software, i.e. by modeling. In order to ‘update’ the Annex 21 screening program in the sense of a ‘modern’ devel- opment taking the original goals into account a proposal has been made that allows a consistent integration of a heat pump into a process based on pinch analysis. The basic elements of this concept are: Substitution of the problem table algorithm by an extended transshipment model which allows a simultaneous optimization of utilities and heat pump. Approximation of the heat exchanger network as in the standard pinch anal- ysis. Development of an algorithm for selecting of a hot and cold stream (may be of several hot and cold streams) to which the heat pump could be connect- ed. Development of a heat pump data base to be used within the simultaneous optimization. Since this optimization is nonlinear a special algorithm needs to be developed that enables convergence. This concept of integrating a heat pump into a process is ‘below’ the sophisticated methods given by H.E. Becker [Methodology and Thermo-Economic Optimization For Integration of Industrial Heat Pumps, THÈSE NO 5341 (2012), ÉCOLE POLYTECHNIQUE FÉDÉRALE DE LAUSANNE, Suisse, 2012]. Presently it is impossible to state whether such a development is unprecedented, relevant and needed. The scoping analysis of existing models shows that the difference between ‘pure’ pinch models and sophisticated mathematical optimization models has been bridged in mod- ern software tools. Regarding the integration of heat pumps into a process, codes like OSMOSE or CERES (amongst may be others) look promising. Independent of any software tools, approaches and optimizations, a general heat pump data base should come more into the focus. Such a data base is needed for many pur- poses. Typical information to the database are not only source and sink temperature as well as size of heat pump etc. but also further details of the selected hot and cold streams to which the heat pump is selected, because this would allow to select a specific heat pump type. The goals of Task 2 should be carefully reconsidered if a “new Task 2” team should be constituted. The State of the Art as well as industrial needs of research organizations, large companies as well as of energy consultants should be critically reviewed. We con- clude that the application of general optimization methods is limited to a fairly small number of research groups and highly specialized groups within large companies. Energy consultants probably will prefer pinch analysis type models. In the whole context we consider the thesis of H.C. Becker (directed by F. Maréchal) as key reference due to the systematic methodology, based on pinch analysis and process integration techniques, to integrate heat pumps into industrial processesPDF Image | Industrial Heat Pumps
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