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ABSIM–modular simulation of advanced absorption systems: Recent software enhancements.

Author(s) : EVRON Y., GOMMED K., GROSSMAN G.

Type of article: Article, IJR article

Summary

ABSIM (an acronym for ABsorption SIMulation) is a computer code for simulation of absorption systems in flexible and modular form. It may be applied to closed and/or open absorption cycles operating at steady state, as well as to vapor compression and other thermodynamic cycles. This modular code is based on unit subroutines containing the governing equations for the system's units/components and on property subroutines containing thermodynamic properties of the working fluids. The units are linked together by a main program which calls the unit subroutines according to the user's specifications to form the complete cycle. When all the equations for the entire cycle have been established, a mathematical solver routine is employed to solve them simultaneously.

As the simulated system becomes more complex, it is increasingly difficult to find a suitable initial guess. If the user obtains one, there is no guarantee that this guess will be adequate for simulating a different system state, even with but a slight change in its parameters (small change in temperature, and/or flow rate, heat transfer coefficients, etc.). To deal with this problem, an automatic initial guess generating algorithm was developed. This algorithm aids the user by automatically selecting the initial guess for the solver to work with. This is to achieve convergence for different operating conditions, given that at least one good initial guess was already obtained for a certain operating point.

An additional new feature of the ABSIM software is the implementation of a genetic optimization algorithm. It is enabled by the above automated initial guess algorithm.

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Pages: 79-84

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Details

  • Original title: ABSIM–modular simulation of advanced absorption systems: Recent software enhancements.
  • Record ID : 30024674
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 93
  • Publication date: 2018/09
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2018.06.011

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