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Modeling simple and complex systems
06/23/2011.
To make the best use of the potential of simulators as Thermoptim by performing reliable modeling of complex systems, you must adopt good methods of construction and verification of models, such as those which are presented in this section.
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Thermoptim extensions
06/23/2011.
This section discusses the different ways to extend Thermoptim through the mechanism of external classes, in order to add new substances and new components, or to drive the simulator.
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Simulation of solar energy systems
06/23/2011.
Solar energy systems have the particularity of having to adapt to a fluctuating energy source, which implies specific calculation methodologies, presented in this section.
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Qualitative analysis of cycles: comparison with the Carnot cycle
06/23/2011.
Among the possible qualitative analysis, the comparison with the Carnot cycle is almost always relevant.
It concerns the shape of the cycle and the nature of the irreversibilities encountered, which are mainly of two types: mechanical and due to heterogeneities in temperature. The plot of the cycle on the usual charts makes it possible to visualize the shape and facilitates the analysis.
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Exergy analyses
06/23/2011.
The conventional performance analysis of various technologies consists in calculating their energy balance.
In addition, particularly when trying to optimize a system, the establishment of their exergy balance is of great interest, as it allows one to quantify the irreversibilities.
Exergy balance poses no particular problem but needs to be done carefully otherwise errors can be committed.
Various tools to conduct exergy balances are proposed: a methodological guide and a spreadsheet for simple systems, the use of productive structures for complex systems.
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Systems optimization / pinch method or thermal integration
06/23/2011.
To choose an efficient heat exchanger configuration, methods derived from thermal or heat integration are emerging among the most efficient, and have particularly the advantage of providing insights that enhance the physical sense of the analyst while the purely automatic methods forced him to work in the dark.
But their main advantage is: it is only after having minimized power consumption of the system studied that the heat exchanger network architecture is defined. For optimal heat transfer, it is sufficient to know all the streams involved, without needing to make a priori assumptions about how they will be connected.
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Technological design and off-design operation
06/23/2011.
The usual phenomenological models presented in this portal certainly allow one to study the thermodynamic cycle of the technology under study, but not to perform a specific technological design or to simulate the off-design performance, the latter two problems being much more complex than the first. This section discusses various developments to address this issue
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