100,003 research outputs found
Optimal Distributed Power Generation Under Network-Load Constraints
In electrical power networks nowadays more and more customers are becoming power-producers, mainly because of the development of novel components for decentralized power generation (solar panels, small wind turbines and heat pumps). This gives rise to the question how many units of each type (solar panel, small wind turbine or central heating power units) can be inserted into any transmission line in the network, such that under given distributions on the typical production and consumption over time, the maximum loads on the lines and components will not be exceeded.
In this paper, we present a linear programming model for maximizing the amount
of decentralized power generation while respecting the load limitations of the
network.
We describe a prototype showing that for an example network the maximization
problem can be solved efficiently. We also modeled the case were the power consumption and decentralized power generation are considered as stochastic variables, which is inherently more complex
The flow of power law fluids in elastic networks and porous media
The flow of power law fluids, which include shear thinning and shear
thickening as well as Newtonian as a special case, in networks of
interconnected elastic tubes is investigated using a residual based pore scale
network modeling method with the employment of newly derived formulae. Two
relations describing the mechanical interaction between the local pressure and
local cross sectional area in distensible tubes of elastic nature are
considered in the derivation of these formulae. The model can be used to
describe shear dependent flows of mainly viscous nature. The behavior of the
proposed model is vindicated by several tests in a number of special and
limiting cases where the results can be verified quantitatively or
qualitatively. The model, which is the first of its kind, incorporates more
than one major non-linearity corresponding to the fluid rheology and conduit
mechanical properties, that is non-Newtonian effects and tube distensibility.
The formulation, implementation and performance indicate that the model enjoys
certain advantages over the existing models such as being exact within the
restricting assumptions on which the model is based, easy implementation, low
computational costs, reliability and smooth convergence. The proposed model can
therefore be used as an alternative to the existing Newtonian distensible
models; moreover it stretches the capabilities of the existing modeling
approaches to reach non-Newtonian rheologies.Comment: 12 pages, 4 figure
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