Chilled water systems


Published on This presentation is a quick overview of the function of a chilled water system

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Chilled water systems

  1. 1. Chilled Water System Typical Operational Overview
  2. 2. Training Overview  Purpose of a chilled water system  Parts of a chilled water system  Plate frame for cooling  Plate frame for reheat  System pumps  Multi pump / chiller systems  Chilled water system sequence of operation  Condenser sequence of operation
  3. 3. Purpose of a chilled water system The purpose of a chilled water system is to provide cold water to air-handler equipment for the purpose of cooling supply air to control space temperature.  Water is cooled to a predetermined set-point that is set within the chiller itself.
  4. 4. Parts of the chilled water system  Evaporator  Area of the chiller that cools the water  Condenser  Area of the system that pulls heat off the machine  Cooling Tower  Cools water from the condenser by dissipating it into the air.  Tower Bypass Valve  Controls condenser water flow either over the cooling tower or recirculates it through the machine.
  5. 5. Parts of the chilled water system
  6. 6. Plate frame for cooling A system that has a plate frame heat exchanger configured for cooling will provide chilled water to air-handlers by using cooler outside air temperatures to cool the water.  Condenser water flows over cooling tower to be cooled by outside air.  Cold condenser water flows through plate frame heat exchanger to cool the chilled water.
  7. 7. Plate Frame for cooling
  8. 8. Plate frame for reheat  A plate frame heat exchanger that is configured for reheat uses the heat generated by the chiller to provide heat for the hot water system.  Heat that isn’t pulled off the machine by the plate frame is pulled off by the cooling tower.
  9. 9. Plate frame for reheat
  10. 10. System pumps  Single pump systems only have one chilled water pump that moves water through the chiller and air handlers.  Multi pump systems have primary chilled water pumps and secondary chilled water pumps.  Primary chilled water pump flows water through the evaporator side of the chiller.  Secondary pumps flow water through AHU’s  Condenser pumps flow water over the cooling tower to remove heat from the machine.
  11. 11. System Pumps
  12. 12. Multi pump / chiller systems Some systems have a total of four chilled water pumps and four condenser water pumps as well as two chillers.  Lead Lag Systems  Allow for either pump combination to run with any chiller  Fixed pump systems  Allow only for a specific pump to run with a specific chiller.
  13. 13. Chilled Water System Sequence of Operation  Chilled water system lockout set-point  Common set-point for economizer disable and chilled water system lockout.  System enable  Chilled water and condenser water pumps start BEFORE the chiller startup  System disable  Chilled water and condenser pumps run for a period of time AFTER chiller is disabled.
  14. 14. Condenser Sequence of operation When condenser water reaches a specific temperature the system reacts to keep temperature from getting too hot. A high condenser temperature can damage the machine. Most chillers will trip on high head pressure.  Cooling tower bypass valve (where equipped) allows condenser water to flow over the tower or recirculate through the machine.  Cooling tower fans help push air through the tower to cool condenser water.  The Plate Frame heat exchanger (where equipped) will also pull heat from the condenser loop.
  15. 15. Questions?