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DCL Version 1.4

Version 1.4 extends cooling flexibility across the chiller and facility layers. Chiller subsystems gain replaceable components and external setpoint connectors. A new datasheet-driven CRAH model (CRAH_Nominal) and a full-system 7 MW example are added.

New features🔗

DataCenter7MW — Full-System Example

A 7 MW data centre plant model integrating the complete cooling chain:

  • High-temperature (HT) loop — WSE chiller plant (Carrier 19FA, 5651 kW) feeding six Vertiv XDU1350 CDUs. At 28 °C ambient, the WSE delivers the full HT load via free cooling.
  • Low-temperature (LT) loop — WSE chiller (McQuay PFH, 2043 kW) feeding three CRAH_Nominal FanWall pairs.
  • IT loads — six NetAiNetRow rows with liquid-cooled AI racks (132 kW, 87% liquid fraction) and air-cooled network racks (22 kW). Total: ~7 MW.
  • EthyleneGlycolWater20 throughout both facility and technical loops.

Replaceable Chiller in WithEconomizer

The chiller in WithEconomizer is now declared replaceable, allowing swapping between LowFidelity.LiquidCooled and HighFidelity.LiquidCooled via a single redeclare at instantiation, without modifying the subsystem.

CRAH_Nominal

A new CRAH model deriving UA from five nominal design-point temperatures and two nominal flow rates — no coil geometry required. Uses a two-resistance power-law for off-design heat transfer with cross-flow (both-fluids-unmixed) effectiveness, consistent with real finned-tube CRAH coils.

NetAiNetRow

A new row-level assembly combining liquid-cooled AI racks and air-cooled network racks in a single reusable component.

Conversion🔗

A conversion script handles breaking changes. Some changes require manual model updates.

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