Detailed Pump (Pressure Dependent)
By M. Brandemuehl
Revised for TRNSYS by N. Blair and R. Schwarz
This model was adapted strictly for use with the TRNSYS Program by
the Solar Energy Laboratory.
The algorithm calculates power consumption and leaving fluid
conditions for a given flow rate and entering fluid conditions. The algorithm
determines the performance and outlet conditions based on a dimensionless
performance curve that relate pressure rise and efficiency to fluid flow rate.
the performance curves are represented by polynomials with empirical
coefficients supplied by the user. It is designed for use with system energy
calculations that include detailed pressure balancing to determine flow rates.
The same model applies to both pumps and fans. The fan model is calculated in
component 1210. The only fundamental difference is in the calculation of
fluid properties. The pump model uses a constant density and specific heat of
the fluid.
The algorithm will correctly calculate inlet air conditions given
outlet air conditions by specifying a negative airflow rate, assuming that
there is negligible change in air density across the fan.
Sample input and output are included in the source code.
REF: A Toolkit for Secondary HVAC System Energy Calculations May 25, 1992
Joint Center for Energy Management University of Colorado at Boulder