HVAC water flow monitoring method based on online identification of pump characteristic curve

Chai Zhuyue, Zhao Tianyi, Liu Zhongjie and Zhang Jili

2020.02.17

Based on the dynamic characteristics of the pump, fits the power-flow and head-flow characteristic curves by the least square method. Carries out a flow test under 12 working conditions with different pump operating frequencies and supply water temperatures using the fitting results. The results show that the error of using head-flow characteristic curve to identify water flow is the smallest, with about 10%. The method not only avoids the influence of cutting the original pipeline, but also reduces the equipment input of the flow sensor, and can directly realize the online identification of the system water flow and heat through the differential pressure sensor.