Point Dictionary: TOWER

Cooling-tower point dictionary. LOOP-SIDE SEMANTICS: water leaving the tower is the COLD stream that enters the chiller condenser, so tower_leaving_temp and its active target ground as Entering_Condenser_Water points; tower_entering_temp is the WARM chiller-leaving return. Bind per tower/cell when outlets and fans are individually sensed; common-header points are valid only where a card explicitly permits them. ASHRAE 223 local names were checked against public-review artifact 223p-1.0.0-ppr2.1.ttl (owl:versionInfo 1.0.0-ppr.2.1; SHA-256 1f156f9938c0be430d2216e01e31bb183c438ba318d8d4a23d2f074ebcd6f573), not an inferred final 2026 release, replacing the former unverified v1.0.0-2026 label. That artifact imports QUDT 3.1.8; quantity-kind and unit local names here were independently checked against the repository-declared QUDT 3.1.4 artifacts. Connection direction and tower/basin location belong in topology/patterns, not invented aspects. Brick 1.4.4 was checked against Brick.ttl SHA-256 b65720b7b9b64c646745c689777e6138c0d59ce0088df0aeb78fbd444d04d8e7.

tower_leaving_temp

Tower leaving (cold, tower-to-chiller) condenser water temperature

• 223P: TemperatureSensor observes a QuantifiableObservableProperty at the CoolingTower Fluid-Water outlet ConnectionPoint that supplies the chiller condenser inlet
• QUDT unit: DEG_C

brick:Entering_Condenser_Water_Temperature_Sensor is exact in Brick 1.4.4: tower-leaving/cold water next enters the condenser. ASHRAE 223 uses s223:CoolingTower, TemperatureSensor, ConnectionPoint and Fluid-Water; leaving direction is topology, not an aspect. TOWER-0001 approach and TOWER-0002 range use this point; TOWER-0005 requires the individual-cell outlet when evaluating an individual fan.

tower_entering_temp

Tower entering (warm, chiller-to-tower) condenser water temperature

• 223P: TemperatureSensor observes a QuantifiableObservableProperty at the CoolingTower Fluid-Water inlet ConnectionPoint returning from the chiller condenser outlet
• QUDT unit: DEG_C

brick:Leaving_Condenser_Water_Temperature_Sensor is exact in Brick 1.4.4 because this warm stream has just left the condenser. Same physical stream as points/chw.points.json cwst. ASHRAE 223 expresses entering direction through the tower inlet ConnectionPoint, not a nonexistent aspect. TOWER-0002 range = tower_entering_temp - tower_leaving_temp.

oa_wetbulb

Outdoor air wet-bulb temperature (normally host-derived psychrometric)

• 223P: Host Function hasOutput a QuantifiableProperty representing outdoor Fluid-Air wet-bulb temperature; a physical Air_Wet_Bulb_Temperature_Sensor is an alternative binding
• QUDT unit: DEG_C

Usually a multivariable psychrometric result from dry-bulb, RH, and station pressure. PPR2.1 provides Function/hasOutput/QuantifiableProperty but no exact derived-wet-bulb aspect; the derivation record carries that meaning. Brick is null because this canonical point is explicitly host-derived; a separate physical binding may use exact brick:Air_Wet_Bulb_Temperature_Sensor and a TemperatureSensor/QOP pattern. The host must document routine, inputs, freshness, and accuracy near saturation. EnergyPlus supplies a native outdoor wet-bulb output.

tower_fan_speed

Individual tower-fan speed feedback (verified command or effective-airflow proxy only when explicitly documented)

• 223P: QuantifiableObservableProperty on the CoolingTower Fan or contained motor via hasProperty
• QUDT unit: PERCENT

ASHRAE 223 PPR2.1 supports an observable DimensionlessRatio/PERCENT property on s223:Fan. Brick 1.4.4 has Motor_Speed_Sensor, but its inherited Speed applicable-unit set does not include PERCENT; this same percent-speed conflict is documented for AHU/VFD points, so the mapping is provisional. Feedback is required for TOWER-0001 and preferred for TOWER-0005. A verified command proxy is weaker; EnergyPlus Cooling Tower Air Flow Rate Ratio x 100 is an explicitly simulation-only effective-airflow proxy rather than mechanical VFD feedback.

tower_fan_status

Independent individual cooling-tower fan run proof

• 223P: EnumeratedObservableProperty on the CoolingTower Fan via hasProperty

brick:Fan_On_Off_Status and PPR2.1 s223:Fan with Binary-OnOff EnumeratedObservableProperty are exact. Bind independent electrical, rotation, airflow, or auxiliary-contact proof for one fan/cell, not command echo or fleet OR. TOWER-0003 counts this point’s rising edges; TOWER-0004 compares it with the final same-fan command.

tower_fan_cmd

Final individual cooling-tower fan run command

• 223P: EnumeratedActuatableProperty on the CoolingTower Fan via hasProperty

brick:Start_Stop_Command is exact and equipment-agnostic; attach it to brick:Cooling_Tower_Fan. PPR2.1 s223:Fan plus Binary-OnOff EnumeratedActuatableProperty is exact. TOWER-0004 requires the final per-fan request after staging, free-convection, anti-cycle, and normal interlock logic; plant enable is invalid.

tower_leaving_temp_sp

Active tower-leaving cold condenser-water temperature setpoint

• 223P: QuantifiableActuatableProperty with Aspect-Setpoint controlling the CoolingTower Fluid-Water outlet ConnectionPoint that supplies the chiller condenser inlet
• QUDT unit: DEG_C

brick:Entering_Condenser_Water_Temperature_Setpoint is exact: tower-leaving cold water is entering-condenser water. PPR2.1 uses exact Aspect-Setpoint; outlet direction remains topology. Bind the active delivered target after reset/limit logic, not an upstream request. A common condenser-loop supply setpoint is valid for individual parallel cells only when the sequence actually gives each cell that target.

oat

Outdoor dry-bulb temperature representative of cooling-tower exposure

• 223P: TemperatureSensor observes a QuantifiableObservableProperty located in an OutdoorPhysicalSpace representative of the CoolingTower exposure
• QUDT unit: DEG_C

brick:Outside_Air_Temperature_Sensor and s223:OutdoorPhysicalSpace are exact. Unlike an AHU intake point, tower ambient exposure is a physical-space observation; Role-OutdoorAirIntake is therefore not used or mis-serialized as an aspect. TOWER-0006 requires representative tower exposure rather than a remote weather point with materially different wind/sun conditions.

tower_basin_temp

Representative cooling-tower collection-basin/sump water temperature

• 223P: TemperatureSensor observes a QuantifiableObservableProperty of Fluid-Water in a site-defined basin/storage component contained in the CoolingTower
• QUDT unit: DEG_C

brick:Collection_Basin_Water_Temperature_Sensor is exact in Brick 1.4.4. PPR2.1 has CoolingTower, TemperatureSensor and Fluid-Water but no collection-basin equipment class, so basin topology is site-defined and the cross-ontology mapping is provisional. Bind a submerged bulk-water sensor away from the heater plume and stagnant pockets; the host separately proves water level and applicability.

tower_basin_heater_cmd

Final request for cooling-tower basin heater operation

• 223P: Binary-OnOff EnumeratedActuatableProperty on an ElectricResistanceElement contained in the CoolingTower and identified by site topology as the basin heater

Brick 1.4.4 has exact Collection_Basin_Water_Heater and Start_Stop_Command classes; attach the command to that equipment. PPR2.1 has ElectricResistanceElement and the enumerated property pattern but no basin-heater class, so basin identity/topology remains provisional. Bind the final local post-thermostat/post-safety request, not a remote enable upstream of low-water or OEM interlocks. A non-electric equivalent needs a site-defined s223 equipment class rather than the ElectricResistanceElement pattern.

tower_basin_heater_status

Independent proof of cooling-tower basin heater operation

• 223P: Binary-OnOff EnumeratedObservableProperty on an ElectricResistanceElement contained in the CoolingTower and identified by site topology as the basin heater

Brick 1.4.4 has exact Collection_Basin_Water_Heater and On_Off_Status classes. PPR2.1 has the electrical element/property terms but no basin-heater class, so the mapping remains provisional. Prefer current, power, contactor, or defensible thermal proof; a command echo is invalid. A proven heater does not prove safe basin level or adequate bulk-water temperature.