ABSTRACT: |
| The work aimed at to develop an application computacional
so that it was used as practical and exactness tool in the projection of
systems of it presses down. The application accomplishes calculations continuous
losses of load using the equations of Darcy-Weissbach, of Hazen-Williams,
of Fair-Whipple-Hsiao, of Flamant and of Manning. The located loss of load
is accomplished by the method of the equivalent length using the number
of diameters. The software permits calculate the pressure height total and
the economical analysis where it is determined the diameter of presses down
economical and the monthly and yearly costs with energy. It grew up windows
that allow the register of pump and electric motors models, so that they
can used in the selection seeking to assist to the project points requested
by the user. It was registered 102 models of pumps and 56 models of electric
motors models. The selection of the pumps can happen through the curve of
the system or through aproject point. The association can be made in series
or in parallel, informing the curve of the system, the model and the number
of bombs to be associated. The program also allows calculate available NPSH.
The results obtained by the application were compared with found them in
the literature. The differences were insignificant and in some cases they
didn’t exist. This software can be used in systems of it presses down
destined to the irrigation, to the water supply and in other types that
seek the transport of fluids. It is recommended the register of new pumps
and electric motors models existent in the area of performance, as well
as the constant updating of the existent databases. Keywords: pressure pump, load loss, economical evaluation |