modelHeatConvOutside

Model for heat transfer at outside surfaces. Choice between multiple models

Extends from Modelica.Thermal.HeatTransfer.Interfaces.Element1D (Partial heat transfer element with two HeatPort connectors that does not store energy).

Information

Overview

The HeatTransferOutside is a model for the convective heat transfer at outside walls

Concept

It allows the choice between three different models:

after DIN 6946: h = 4+4v , where h (hCon) is the heat transfer coefficent and v is the wind speed
after the ASHRAE Fundamentals Handbook from 1989, the way it is presented in EnergyPlus Engineering reference from 2011: h = D+Ev+Fv^2 , where h (hCon) and v are as above and the coefficients D, E, F depend on the surface of the outer wall.
Attention: This is a combined coefficient for convective and radiative heat exchange.
with a custom constant h (hCon) value

References

DIN 6946 p.20
ASHRAEHandbook1989, as cited in EnergyPlus Engineering Reference. : EnergyPlus Engineering Reference, 2011 p.56

Example Results

AixLib.Utilities.Examples.HeatTransfer_test

November 16, 2016 by Ana Constantin:
Conditioned input WindSpeedPort and introduced protected input WindSpeed_internal

April 1, 2014 by Ana Constantin:
Uses components from MSL and respects the naming conventions

Type	Name	Default	Description
Computational Models
AixLib.ThermalZones.HighOrder.Components.Types.CalcMethodConvectiveHeatTransfer	calcMethod	AixLib.ThermalZones.HighOrder.Components.Types.CalcMethodConvectiveHeatTransfer.ASHRAE_Fundamentals	Calculation method for convective heat transfer coefficient
Surface properties
Modelica.Units.SI.Area	A		Area of surface
Modelica.Units.SI.CoefficientOfHeatTransfer	hCon_const	25	Custom convective heat transfer coeffient
DataBase.Surfaces.RoughnessForHT.PolynomialCoefficients_ASHRAEHandbook	surfaceType	DataBase.Surfaces.RoughnessForHT.Brick_RoughPlaster()	Surface type

Type	Name	Default	Description
HeatPort_a	port_a (from Element1D)
HeatPort_b	port_b (from Element1D)
Modelica.Blocks.Interfaces.RealInput	WindSpeedPort

Type	Name	Description
SI.HeatFlowRate	Q_flow (from Element1D)	Heat flow rate from port_a -> port_b
SI.TemperatureDifference	dT (from Element1D)	port_a.T - port_b.T
Modelica.Units.SI.CoefficientOfHeatTransfer	hCon	Convection heat transfer coeffient