TOC

  1. Intro
  2. TagModel
  3. Structure
  4. TimeZones
  5. Units
  6. Grids
  7. Filters
  8. Zinc
  9. Json
  10. Trio
  11. Csv
  12. Rest
  13. Ops
  14. Auth
  15. VFDs
  16. Networks
  17. Energy
  18. Zones
  19. AHUs
  20. VAVs
  21. UnitaryEquips
  22. Chillers
    1. Overview
    2. Chilled Water Plants
    3. Chillers
    4. Cooling Towers
    5. Heat Exchangers
  23. Boilers
  24. Tanks
  25. ElecPanels
  26. Lighting
  27. Builds
  28. Bacnet
  29. ChangeLog
  30. License

Chillers

Overview

A chilled water plant is composed of multiple pieces of equipment used to generate chilled water. The entire plant is modeled as an equip with its own plant-level points. Sub-equipment such as chillers and cooling towers are also modeled as equip contained by the plant via the equipRef tag.

The follow diagram shows the terminology used for logical flow of water through a plant:

chilledWaterPlant

Note that the terminology for sensors/setpoints are based on the perspective of the equipment. The condenser water leaving the chiller, is the condenser water entering the cooling tower.

Chilled Water Plants

We model the entire plant using the chilledWaterPlant tag. The plant is modeled as an equip and it will define its own plant level points:

Chilled water to/from AHUs

Condenser water between Chillers/Cooling Towers

Note: not every combination of sp is listed, just most common setpoints.

We also define the following tags for pipework ands its associated equip and points:

Chillers

Chiller equips are marked with the chiller tag. Equip level tags:

Points associated with chiller equip:

Run/Status

Chilled water to/from AHUs

Condenser water to/from cooling towers

Misc Internal

Note: not every combination of sp is listed, just most common setpoints. Chillers share the same point modeling conventions as VFDs. Chillers which measure energy should model their points using the same conventions as elec meters or thermal meters.

Cooling Towers

Cooling towers equips are marked with the coolingTower tag. Equip level tags:

Points associated with cooling tower equip:

Heat Exchangers

Heat exchangers are tagged with heatExchanger. Equip level tags:

Points associated with heat exchanger equip: