Simulação computacional de bombas com velocidade de rotação variável no EPANET
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2015-12-10
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Universidade Federal de Goiás
Resumo
In water distribution systems, most of the electricity is consumed by pumping
systems. Thus, reducing the inefficiency of the pump can provide significant energy
savings. This can be achieved by substituting fixed-speed pumps by variable-speed
pumps (VSP). However, the high costs of installation and operation of the VSPs
require a preliminary economic assessment of the design, which is usually
accompanied by the use of hydraulic solvers to simulate the behavior of the water
network. One of the most used softwares for this purpose is the EPANET 2, which
uses the gradient method for the hydraulic analysis of the steady flow. However, the
EPANET 2 is inaccurate when computing the VSP efficiency. This is because the
software does not take into account the changes in the pump efficiency curve when
the pump speed is changed. In this study, a routine for calculating VSPs efficiency,
based on the Sârbu and Borza (1998) formula, is implemented in the source code of
the EPANET 2. The influence of the new routine on the results predicted by the
software for efficiency, power and energy consumption of the VSP is evaluated in
simulations with a hypothetical network. The results showed that the original version
of EPANET 2 tends to underestimate the efficiency and thus overestimate the power
and energy consumption of the VSPs. In the present case, the energy consumption
of the system predicted by the original version of EPANET 2 was 21.99% higher than
the predicted by the modified version. These results point out that the modified
version of EPANET 2 provides a better prediction of VSPs behavior and thus its use
is recommended in the simulation of water distribution networks equipped with VSPs.
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COUTINHO, R. S. Simulação computacional de bombas com velocidade de rotação variável no EPANET. 2015. 88 f. Dissertação (Mestrado em Engenharia do Meio Ambiente) - Universidade Federal de Goiás, Goiânia, 2015.