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Artificial Invention

Synthesis of Innovative Thermal Networks, Power Cycles, Process Flowsheets and Other Systems

Autor: Alexander Kott

Jazyk:

Vazba: Brožovaná

Vydavatel: Dissertation.Com. - Do Not Use

Dostupnost: Skladem u dodavatele

Odesíláme za 9-15 dnů

876 Kč

This dissertation proposes a computational technique for automated "invention" of conceptual schemes...

Informace o knize

Autor

Alexander Kott

Jazyk

Angličtina

Vazba

Kniha - Brožovaná

Vydáno

2005

Stránek

292

EAN

9781581122640

ISBN

9781581122640

Enbook ID

08744063

Vydavatel

Dissertation.Com. - Do Not Use

Hmotnost

526

Rozměry

189 x 246 x 15

Kompletní popis

This dissertation proposes a computational technique for automated "invention" of conceptual schemes of thermal systems. The input provided to the automated problem solver is a description of the streams entering and leaving the system. The output is a network of elementary processes: compression, expansion, heating, cooling, and chemical processes. The problem solver seeks a network that is feasible, and offers an optimal (or at least favorable) combination of energy and capital costs. The synthesis process is modeled as a heuristic search conducted in a state-space of all possible design versions. The main ideas of the dissertation have been implemented in a computer program called TED, which invented a number of nontrivial schemes. TED starts with an initial state (or states), which may be either proposed by the user or generated automatically. TED evaluates each state using a special technique of exergy analysis applied to an infinitesimal temperature interval. This allows us to describe the thermal system by several integral characteristics which are functions of temperature. One particularly important integral characteristic - a measure of system's Second Law infeasibility - is introduced in this work; it allows a uniform treatment of both feasible and infeasible design states. TED then selects the most promising of the available designs. This selection is guided by a specialized search algorithm BP* which is shown to be probabilistically admissible. The results of the exergy analysis are used to perform a look-ahead evaluation of the design states. BP* also uses backpropagation of the state evaluation function to reduce the amount of backtracking. TED then improves the selected design by applying one of the transforming operators and thereby generating a new design. Each transformation involves addition of an incremental network of thermal processes to the original state and reduces either irreversibility (exergy loss) or infeasibility of the thermal system. The application of the transformations is controlled by a heuristic move generation function that selects the most promising transformations. The new design is added to the database of the available design states. The search continues with these evaluate-select-transform iterations until an (approximately) optimal design is found.

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Artificial Invention

Synthesis of Innovative Thermal Networks, Power Cycles, Process Flowsheets and Other Systems

Informace o knize

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