Centrifugal Pump
by Jurgen Eckstein 1990

	This type represents a centrifugal pump, which is designed to
run with an electric motor.  The model requires two sets of data:
head-flowrate data at reference speed and efficiency-flowrate data at
reference speed.  A linear regression is performed to fit a curve through 
those data.  The normal equations are solved using Gaussian elimination
with partial pivoting.  Newtons method is implemented to solve a 
system of nonlinear equations.  Sample input and output are included in 
the source code.

REF: Detailed Modeling of Photovoltaic System Components (Masters Thesis)
      Solar Energy Laboratory   University of Wisconsin at Madison