Simple System Pump
by S. Gabel and 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 pump power and leaving fluid temperature for a
given flow rate and entering fluid conditions. The algorithm is designed for
use with system energy calculations in which the detailed pressure balance
information is not known. The pump power consumption is calculated from a
regression of part-load power consumption as a function of part-load flow.
Pump design is characterized by the pressure rise, volumetric flow rate, and
pump/motor power consumption at a rating condition. Power consumption at
part-load is determined by an empirical relationship as a function of the
ratio of operating flow to rated flow. The pressure rise across the pump is not
calculated. The fluid temperature rise is calculated to account for shaft
power input, assuming that both the motor efficiency and the combined pump/motor
efficiency are constant. It should be noted that the algorithm will correctly
calculate inlet fluid conditions given outlet fluid conditions by specifying a
negative fluidflow rate, assuming that there is negligible change in fluid
density across the pump.
Sample input and output included in the source code.
REF: A Toolkit for Secondary HVAC System Energy Calculations May 25, 1992
Joint Center for Energy Management Univ. of Colorado at Boulder