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Modeling hybrid solar gas-turbine power plants:1
Thermodynamic projection of annual performance and2
emissions3
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R.P. Merch´ana, M.J. Santosa, I. Reyes-Ram´ırezb, A. Medinaa, A. Calvo4
Hern´andeza
aDepartment of Applied Physics, University of Salamanca, 37008 Salamanca, Spain
bUPIITA - Instituto Polit´ecnico Nacional, M´exico D.F., M´exico
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Abstract
The annual performance, fuel consumption and emissions of a hybrid ther-
mosolar central tower Brayton plant is analyzed in yearly terms by means
of a thermodynamic model. The model constitutes a step forward over a
previously developed one, that was satisfactorily validated for fixed solar ir-
radiance and ambient temperature. It is general and easily applicable to
different plant configurations and power output ranges. The overall system
is assumed as formed by three subsystems linked by heat exchangers: solar
collector, combustion chamber, and recuperative Brayton gas-turbine. Sub-
system models consider all the main irreversibility sources existing in real
installations. This allows to compare the performance of a real plant with
that it would have in ideal conditions, without losses. Furthermore, the im-
proved version of the model is capable to consider fluctuating values of solar
irradiance and ambient temperature. Numerical calculations are presented
taking particular parameters from a real installation and actual meteorolog-
ical data. Several cases are analyzed, including plant operation in hybrid
or pure combustion modes, with or without recuperation. Previous studies
concluded that this technology is interesting from the ecological viewpoint,
but that to be compelling for commercialization, global thermal efficiency
should be improved (currently yearly averaged thermal efficiency is about
30% for recuperative plants). We analyze the margin for improvement for
each plant subsystem, and it is concluded that, the Brayton heat engine,
by far, is the key element to improve overall thermal efficiency. Numerical
estimations of achievable efficiencies are presented for a particular plant and
real meteorological conditions.
Preprint submitted to Energy Conversion and Management December 14, 2016
Email addresses: rpmerchan@usal.es (R.P. Merch´an), smjesus@usal.es (M.J.
Santos), ireyesram@hotmail.com (I. Reyes-Ram´ırez), amd385@usal.es (A. Medina),
anca@usal.es (A. Calvo Hern´andez) |
