Extended approach for modelling fixed-flow variable speed pumps

The original algorithm development of direct calculation pump speed by Todini, Tryby, Wu and Walski (2007) was to maintain a target hydraulic head while this paper extends the algorithm and its implementation for direct calculation of pump speed to deliver the fixed flow via a variable speed pump. The fixed flow pumping is desirable in practical conditions where a fixed amount of flow needs to be supplied to the system to meet demand and/or fill a storage tank. The implementation shows that the extended algorithm is very straightforward based upon the original development. An example system is tested to verify the enhanced development and also to demonstrate the application of modeling the fixed flow variable speed pumps.