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Heating Water Systems (HWS)

Type Definition

Hydronic heating water systems (HWS) contain boilers (BLR) to heat the water and pumps (PMP) to distribute the heated water to downstream equipment and/or to circulate the water through the boilers.

Type Requirements

  • It must handle water for the purposes of heating.

Example: Variable Primary HWS

This version of HWS has a single set of variable speed pumps which serve boilers and downstream equipment.

BMS Example

HWS Variable Primary Notes:

  • The fields associated with individual devices (e.g., individual supply water temps for each boiler) get mapped to those individual devices while system level telemetry (e.g., system supply water temperature) gets assigned to the heating water system directly.

System Diagram and Connections

HWS Variable Primary

Sample Building Config

BLDG-1:
  type: FACILITIES/BUILDING

ZONE-1:
  connections:
    BLDG-1: CONTAINS
    VAV-1: FEEDS
  type: FACILITIES/ZONE

ZONE-2:
  connections:
    BLDG-1: CONTAINS
    FCU-1: FEEDS
  type: FACILITIES/ZONE

# Define the system that all equipment is part of.
# It will feed all downstream equipment.
HWSYS-BLDG-1:
  cloud_device_id: 1234
  connections:
    BLDG-1: CONTAINS
  type: HVAC/HWS_...
  translation:
    supply_water_temperature_sensor:
      present_value: points.sys_swt.present_value
      units:
        key: pointset.points.sys_swt.units
        values:
          degrees_fahrenheit: 'deg-F'
    differential_pressure_sensor:
      present_value: points.sys_dp.present_value
      units:
        key: pointset.points.sys_dp.units
        values:
          pascals: 'Pa'
    ...


# Define the equipment for the system and connect it to the system
# Additional intrasystem connections can be made as well.
BLR-1:
  cloud_device_id: 12234
  connections:
    BLDG-1: CONTAINS
    HWSYS-BLDG-1: HAS_PART
    PMP-1: FEEDS
    PMP-2: FEEDS
    PMP-3: FEEDS
  type: HVAC/BLR_...
  translation:
    supply_water_temperature_sensor:
      present_value: points.swt.present_value
      units:
        key: pointset.points.swt.units
        values:
          degrees_fahrenheit: 'deg-F'
    ...

BLR-2:
  cloud_device_id: 12334
  connections:
    BLDG-1: CONTAINS
    HWSYS-BLDG-1: HAS_PART
    PMP-1: FEEDS
    PMP-2: FEEDS
    PMP-3: FEEDS
  type: HVAC/BLR_...
  translation:
    supply_water_temperature_sensor:
      present_value: points.swt.present_value
      units:
        key: pointset.points.swt.units
        values:
          degrees_fahrenheit: 'deg-F'
    ...

BLR-3:
  cloud_device_id: 12344
  connections:
    BLDG-1: CONTAINS
    HWSYS-BLDG-1: HAS_PART
    PMP-1: FEEDS
    PMP-2: FEEDS
    PMP-3: FEEDS
  type: HVAC/BLR_...
  translation:
    supply_water_temperature_sensor:
      present_value: points.swt.present_value
      units:
        key: pointset.points.swt.units
        values:
          degrees_fahrenheit: 'deg-F'
    ...

PMP-1:
  cloud_device_id: 12345
  connections:
    BLDG-1: CONTAINS
    HWSYS-BLDG-1: CONTAINS
  type: HVAC/PMP_...
  translation:
    run_command:
      present_value: points.cmd.present_value
      states:
        OFF: 'false'
        ON: 'true'
    ...

PMP-2:
  cloud_device_id: 123432
  connections:
    BLDG-1: CONTAINS
    HWSYS-BLDG-1: CONTAINS
  type: HVAC/PMP_...
  translation:
    run_command:
      present_value: points.cmd.present_value
      states:
        OFF: 'false'
        ON: 'true'
    ...

PMP-3:
  cloud_device_id: 123443
  connections:
    BLDG-1: CONTAINS
    HWSYS-BLDG-1: CONTAINS
  type: HVAC/PMP_...
  translation:
    run_command:
      present_value: points.cmd.present_value
      states:
        OFF: 'false'
        ON: 'true'
    ...


# Define the equipment which is fed from the system, and connect it to the systems.
FCU-1:
  cloud_device_id: 123453
  connections:
    BLDG-1: CONTAINS
    HWSYS-BLDG-1: FEEDS
  type: HVAC/FCU_DFSS_DFVSC_...
  translation:
    heating_water_valve_percentage_command:
      present_value: points.htg_valve_percentage_command.present_value
      units:
        key: pointset.points.htg_valve_percentage_command.units
        values:
          percent: '%'
    ...

VAV-1:
  cloud_device_id: 12346526
  connections:
    BLDG-1: CONTAINS
    HWSYS-BLDG-1: FEEDS
  type: HVAC/VAV_SD_DSP_...
  translation:
    heating_water_valve_percentage_command:
      present_value: points.hwv.present_value
      units:
        key: pointset.points.hwv.units
        values:
          percent: '%'
    ...

Note: All BMS screenshots taken from Google's WebCTRL instances. WebCTRL is a building automation system owned by Automated Logic.