modelPartialAirLiquidRearDoorHex
Partial model for hybrid rack combining liquid-cooled and air-cooled components with a rear door heat exchanger
Extends from Buildings.Fluid.DataCenters.Racks.Hybrid.BaseClasses.AirLiquid (Partial hybrid rack model combining liquid-cooled and air-cooled components).
Information
Partial model of a hybrid IT rack that combines liquid-cooled and air-cooled components with a rear door heat exchanger.
This model extends Buildings.Fluid.DataCenters.Racks.Hybrid.BaseClasses.AirLiquid and adds a partial model for a rear door heat exchanger.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Performance data | |||
| Buildings.Fluid.DataCenters.Racks.Hybrid.Data.AirLiquid.Generic | dat (from AirLiquid) | Performance data | |
| Dynamics › Liquid cooling | |||
| Modelica.Fluid.Types.Dynamics | energyDynamicsLiq (from AirLiquid) | Modelica.Fluid.Types.Dynamics.DynamicFreeInitial | Type of energy balance for liquid-cooled component: dynamic (3 initialization options) or steady state |
| Modelica.Units.SI.Time | tauLiq (from AirLiquid) | 2 | Time constant of liquid outlet temperature at nominal flow |
| Initialization › Liquid cooling | |||
| Modelica.Units.SI.Temperature | TLiq_start (from AirLiquid) | 293.15 | Start value of liquid temperature |
| Liquid cooling | |||
| Modelica.Units.SI.VolumeFlowRate | VColPla_flow_nominal (from AirLiquid) | sum(dat.liq.theRes.V_flow)/size(dat.liq.theRes.V_flow, 1) | Design flow rate of one cold plate for liquid cooling |
| Real | nColPla (from AirLiquid) | dat.liq.PIT_nominal/(VColPla_flow_nominal*1000*4200*(dat.liq.PIT_nominal/(dat.liq.m_flow_nominal*4200))) | Number of cold plates for liquid cooling |
| Advanced › Liquid cooling | |||
| Boolean | linearizedLiq (from AirLiquid) | false | = true, use linear relation between m_flow and dp for liquid cooling |
| Dynamics › Air cooling | |||
| Modelica.Fluid.Types.Dynamics | energyDynamicsAir (from AirLiquid) | Modelica.Fluid.Types.Dynamics.DynamicFreeInitial | Type of energy balance for air-cooled component: dynamic (3 initialization options) or steady state |
| Modelica.Units.SI.Time | tauAir (from AirLiquid) | 2 | Time constant of air outlet temperature at nominal flow |
| Initialization › Air cooling | |||
| Modelica.Units.SI.Temperature | TAir_start (from AirLiquid) | 293.15 | Start value of air temperature |
| Fan controller | |||
| Buildings.Fluid.DataCenters.Racks.FanControllers.Types.Strategy | fanControl (from AirLiquid) | Buildings.Fluid.DataCenters.Racks.FanControllers.Types.Strategy.Load | Type of fan control strategy |
| Real[:,:] | fanSpeed (from AirLiquid) | [0.0, 0.0; 1.0, 1.0] | Load and fan speed matrix (1st column normalized IT load, 2nd fan speed), e.g., fanSpeed=[0, 0; 0.5, 0.7; 1, 1]) |
| Modelica.Units.SI.Temperature | TAirOut_set (from AirLiquid) | dat.air.TOut_nominal | Set point temperature for rack outlet air |
| Real | k (from AirLiquid) | 1 | Gain of fan PI controller |
| Modelica.Units.SI.Time | Ti (from AirLiquid) | 60 | Integrator time constant of fan PI controller |
| Assumptions | |||
| Boolean | allowFlowReversalAir (from AirLiquid) | true | = false to simplify equations, assuming, but not enforcing, no flow reversal for air loop |
| Boolean | allowFlowReversalLiq (from AirLiquid) | true | = false to simplify equations, assuming, but not enforcing, no flow reversal for liquid loop |
| Boolean | allowFlowReversalCoo | true | = false to simplify equations, assuming, but not enforcing, no flow reversal for rear door heat exchanger coolant |
Connectors
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Buildings.Fluid.DataCenters.Racks.Liquid.ColdPlateR_P | liq (from AirLiquid) | Liquid-cooled rack component | |
| Buildings.Fluid.DataCenters.Racks.Air.Rack_P | air (from AirLiquid) | Air-cooled rack component | |
| Buildings.Fluid.DataCenters.Racks.RearDoorHeatExchangers.BaseClasses.PartialRearDoorHeatExchanger | reaDooHex |
Contents
| Name | Description |
|---|---|
 MediumReaDooHex | Medium for rear door heat exchanger coolant loop |
Revisions
-
September 12, 2026, by Michael Wetter:
First implementation.