Chilled Water Pump Vfd

A typical chiller plant consists of a chiller or multiple chillers along with chilled water pumps condenser water pumps and cooling towers.

Chilled water pump vfd.

The three trane cvhe450 centrifugal chillers also had variable speed compressors. Vfd s variable frequency drives are usually employed to serve the purpose of feeding electrical power to pump motors as these provide a good control over speed of motor which in turn changes the gpm s gallon per minutes being supplied to load end. Enable the primary chilled water pump when outside air temperature is above setpoint and at least 1 chilled. Variable frequency drives have been used extensively for air handling unit fans cooling tower fans and water pumps for a long time.

Vfd to maintain a fixed. The selection of this equipment is driven by the individual efficiencies at full and partial loads and also by how the system efficiency will respond to the building loads. Actually vfd normally used in secondary pump but in some diagram it shows in primary pump so please clarify what is role of vfd in chilled water system and where it used. With state of the art compressor technology and microprocessor based control systems manufacturers now offer variable frequency drives specially designed for centrifugal chillers.

Control question added by rashid ali abdul haque senior mechanical engineer bureau veritas. The existing chilled water system consisted of two variable flow primary chilled water pumps three variable speed cooling fans and three constant volume condenser water pumps. Water differential pressure transmitter near the end of the piping run varies the speed of the vfd. The single primary pump pumps water through the chiller and to the coils.