Energy saving analysis on replacing control valves by frequency controlled pumps in terminal of air conditioning chilled water system

Taking the primary pump constant flow chilled water system of FCU with PAU air conditioning system as an example, analyses the mode and characteristics of the new system using frequency controlled pumps replacing control valves, calculates and compares the energy consumption of the pump between the new system and traditional systems in cooling seasons.  The results show that the new system has a certain energy saving potential, but motor loss has a large proportion to total pump power when variable frequency pump is used.