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Chilled Water Recirculation Loop Diagram for Commercial Building HVAC

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UPDATED 2026-09-24
TYPEPid
USE-CASEWater Recirculation Circuit
EXAMPLEChilled Water Recirculation Loop Diagram for Commercial Building HVAC
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CASE ANALYSIS

Scenario

A commercial building HVAC engineer documents a chilled water recirculation loop for a water-cooled chiller serving an AHU coil, including primary pump, flow control valve, and instrumentation.

Key decisions

  • Model the chiller and AHU coil as shell-and-tube heat exchangers (hx_shell_tube) because dedicated chiller/coil equipment types are not in the schematex-pid catalog.
  • Use an FO (fail-open) diaphragm-actuated control valve on the supply line to maintain loop flow, and add a flow transmitter/controller loop.
  • Keep the loop closed with process lines returning from the coil to the chiller, and omit an expansion tank because line-branch connections are not supported in this grammar.

When to reuse this

Use this template for any closed-loop chilled water or hydronic recirculation diagram where a heat source/sink (chiller, boiler) serves a remote load via supply/return piping and a pump.

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