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DCL Version 1.3

Version 1.3 improves the CDU off-design heat transfer model and extends the calibration workflow to support multi-temperature datasets. Additional vendor CDU performance records are also included.

New features🔗

  • Two-resistance off-design UA model — EpsNTUNominal_LiquidToLiquid is updated to a two-resistance series formulation with independent flow and viscosity scaling per fluid side, replacing the previous single-parameter power-law.
  • Updated GenericCDU record — new calibration parameters (r_TCS, n_mu_TCS, n_mu_FWS) support the two-resistance model. All Vertiv XDU1350 records updated with calibrated values.
  • Extended W1–W4 calibration workflow — the VertivXDU1350 workflow now covers all four ASHRAE liquid-cooling classes, with per-class verification models and a new W4 record.
  • nVent CDU800 records (W1–W3) — three performance records added for the nVent CDU800. Due to limited datasheet data, heat-transfer errors of 4–26% remain after calibration — fully documented in the records.
  • OCP Deschutes 2 MW CDU record (W1–W4) — a single combined record valid across the full W1–W4 range. Accuracy: Q < 1.4% across 10–39 kg/s; ATD < 1.2% above 24 kg/s.
  • Refroid SentraFlo ATD4 records and vendor model — three records classified by facility water loop temperature rise (7 K / 10 K / 12 K), plus a pre-configured vendor CDU model. Single calibration valid across all ASHRAE W-classes.
  • CDU_Nominal input renamed — the TCS mass flow rate setpoint input is renamed from m_flow_TCS to m_flow_TCS_set.
  • In-row CDU package renamed — DataCenter.Facility.CDU.FacilityCDU renamed to DataCenter.Facility.CDU.InRow. A conversion script handles the update.
  • Heat Exchanger Library 5.0 dependency removed.

Conversion🔗

A conversion script handles the breaking changes automatically. Key manual updates:

  • Rename connections to m_flow_TCS → m_flow_TCS_set.
  • Replace FacilityCDU path with InRow in model instantiations and documentation links.
  • Replace the previous n calibration parameter with r_TCS, n_mu_TCS, and n_mu_FWS (all default 0.5); re-run calibration.
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