modelDXCooling

DX cooling coil operation

Extends from Buildings.Fluid.DXSystems.Cooling.BaseClasses.PartialCoilInterface (Partial block for DX coil).

Information

This block combines the models for the dry coil and the wet coil. Output of the block is the coil performance which, depending on the mass fraction at the apparatus dew point temperature and the mass fraction of the coil inlet air, may be from the dry coil, the wet coil, or a weighted average of the two.

Parameters

Type	Name	Description
Buildings.Fluid.DXSystems.Cooling.AirSource.Data.Generic.DXCoil	datCoi (from EssentialParameters)	Performance data
Boolean	use_mCon_flow (from PartialCoilInterface)	Set to true to enable connector for the condenser mass flow rate
Boolean	variableSpeedCoil	Flag, set to true for coil with variable speed

Connectors

Type	Name	Description
Modelica.Blocks.Interfaces.IntegerInput	stage (from PartialCoilInterface)	Stage of coil, or 0/1 for variable-speed coil
Modelica.Blocks.Interfaces.RealInput	speRat (from PartialCoilInterface)	Speed ratio
Modelica.Blocks.Interfaces.RealInput	m_flow (from PartialCoilInterface)	Air mass flow rate
Modelica.Blocks.Interfaces.RealInput	TEvaIn (from PartialCoilInterface)	Temperature of air entering the cooling coil
Modelica.Blocks.Interfaces.RealInput	TConIn (from PartialCoilInterface)	Outside air dry bulb temperature for an air cooled condenser or wetbulb temperature for an evaporative cooled condenser
Modelica.Blocks.Interfaces.RealOutput	EIR (from PartialCoilInterface)	Energy Input Ratio
Modelica.Blocks.Interfaces.RealOutput	Q_flow (from PartialCoilInterface)	Total cooling capacity
Modelica.Blocks.Interfaces.RealInput	mCon_flow (from PartialCoilInterface)	Water mass flow rate at condensers for water source DX units
Modelica.Blocks.Interfaces.RealOutput	mWat_flow	Mass flow rate of water condensed at cooling coil
Modelica.Blocks.Interfaces.RealOutput	SHR	Sensible Heat Ratio: Ratio of sensible heat load to total heat load
Modelica.Blocks.Interfaces.RealInput	XEvaIn	Inlet air mass fraction
Modelica.Blocks.Interfaces.RealInput	p	Pressure at inlet of coil
Modelica.Blocks.Interfaces.RealInput	hEvaIn	Specific enthalpy of air entering the coil

Components

Type	Name	Description
WetCoil	wetCoi	Wet coil condition
DXSystems.BaseClasses.DryCoil	dryCoi	Dry coil condition
Buildings.Fluid.DXSystems.Cooling.BaseClasses.DryWetSelector	dryWet	Actual coil condition

Name	Description
Medium	Medium model

Revisions

September 20, 2012 by Michael Wetter:
Revised implementation.
September 4, 2012 by Michael Wetter:
Renamed connector to follow naming convention.
April 12, 2012 by Kaustubh Phalak:
First implementation.