Chilled Water Pump Vfd

Control question added by rashid ali abdul haque senior mechanical engineer bureau veritas.

Chilled water pump vfd.

The three trane cvhe450 centrifugal chillers also had variable speed compressors. A typical chiller plant consists of a chiller or multiple chillers along with chilled water pumps condenser water pumps and cooling towers. Secondary pump in chilled water system is responsible to pump the chilled water to load end i e. Water differential pressure transmitter near the end of the piping run varies the speed of the vfd.

The building is a large distribution center that primarily uses chilled water for cooling. With state of the art compressor technology and microprocessor based control systems manufacturers now offer variable frequency drives specially designed for centrifugal chillers. 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. 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.

Enable the primary chilled water pump when outside air temperature is above setpoint and at least 1 chilled. Vfd technology is not new to the hvac industry. The single primary pump pumps water through the chiller and to the coils. Vfd to maintain a fixed.