modelHeatStorage

Simple model of a heat storage

Extends from AixLib.Obsolete.BaseClasses.ObsoleteModel (Icon for classes that are obsolete and will be removed in later versions).

Information

Overview

Buffer storage model with support for heating rod and two heating coils.

Concept

It represents a buffer storage stratified into n layers where 1 represents the bottom layer and n represents the top layer. The layers are connected to each other allowing heat and fluid transfer. The conductance, buoyancy and enthalpy flow represent the heat transfer between the layers.

The geometrical data for the storage is read by records in the DataBase package.

The model also includes heat losses over the storage walls (wall, top and bottom).

Parameters

Type	Name	Default	Description
Real	tau	1000	Time constant for mixing
Integer	n	3	Model assumptions Number of Layers
Modelica.Units.SI.CoefficientOfHeatTransfer	hConIn	1500	Heat transfer coefficient at the inner wall
Modelica.Units.SI.CoefficientOfHeatTransfer	hConOut	15	Heat transfer coefficient at the outer wall
AixLib.DataBase.Storage.BufferStorageBaseDataDefinition	data	AixLib.DataBase.Storage.Generic_New_2000l()	Storage data
Integer	n_HC1_up	integer(AixLib.Utilities.Math.Functions.round(data.hHC1Up/(data.hTank/n) + 0.5, 0))
Integer	n_HC1_low	integer(AixLib.Utilities.Math.Functions.round(data.hHC1Low/(data.hTank/n) + 0.5, 0))
Integer	dis_HC1	n_HC1_up - n_HC1_low + 1
Integer	n_HR	integer(AixLib.Utilities.Math.Functions.round(data.hHR/(data.hTank/n) + 0.5, 0))
Integer	n_HC2_up	integer(AixLib.Utilities.Math.Functions.round(data.hHC2Up/(data.hTank/n) + 0.5, 0))
Integer	n_HC2_low	integer(AixLib.Utilities.Math.Functions.round(data.hHC2Low/(data.hTank/n) + 0.5, 0))
Integer	dis_HC2	n_HC2_up - n_HC2_low + 1
Integer	n_TS1	integer(AixLib.Utilities.Math.Functions.round(data.hTS1/(data.hTank/n) + 0.5, 0))
Integer	n_TS2	integer(AixLib.Utilities.Math.Functions.round(data.hTS2/(data.hTank/n) + 0.5, 0))
Medium
AixLib.Obsolete.YearIndependent.FastHVAC.Media.BaseClasses.MediumSimple	medium	AixLib.Obsolete.YearIndependent.FastHVAC.Media.WaterSimple()	Mediums charastics (heat capacity, density, thermal conductivity)
AixLib.Obsolete.YearIndependent.FastHVAC.Media.BaseClasses.MediumSimple	mediumHC1	AixLib.Obsolete.YearIndependent.FastHVAC.Media.WaterSimple()	Mediums charastics for HC1 (heat capacity, density, thermal conductivity)
AixLib.Obsolete.YearIndependent.FastHVAC.Media.BaseClasses.MediumSimple	mediumHC2	AixLib.Obsolete.YearIndependent.FastHVAC.Media.WaterSimple()	Mediums charastics for HC2 (heat capacity, density, thermal conductivity)
Initialisation
Modelica.Units.SI.Temperature	T_start	323.15	Start temperature of medium
Modelica.Units.SI.Temperature	T_start_wall	293.15	Starting Temperature of wall in K
Modelica.Units.SI.Temperature	T_start_ins	293.15	Starting Temperature of insulation in K
Heating Coils and Rod
Boolean	use_heatingCoil1	true	Use Heating Coil1?
Boolean	use_heatingCoil2	true	Use Heating Coil2?
Boolean	use_heatingRod	true	Use Heating Rod?
Modelica.Units.SI.CoefficientOfHeatTransfer	hConHC1	20	Model assumptions heat transfer coefficient HC1 <-> Heating Water
Modelica.Units.SI.CoefficientOfHeatTransfer	hConHC2	400	Model assumptions heat transfer coefficient HC2 <-> Heating Water
Boolean	Up_to_down_HC1	true	Heating Coil 1 orientation from up to down?
Boolean	Up_to_down_HC2	true	Heating Coil 2 orientation from up to down?
Boolean	calcHCon	true	Use calculated value for inside heat transfer coefficient
Modelica.Units.SI.CoefficientOfHeatTransfer	hConIn_const	30	Fix value for heat transfer coefficient inside pipe

Connectors

Type	Name	Description
AixLib.Obsolete.YearIndependent.FastHVAC.Interfaces.EnthalpyPort_a	LoadingCycle_In
AixLib.Obsolete.YearIndependent.FastHVAC.Interfaces.EnthalpyPort_b	LoadingCycle_Out
AixLib.Obsolete.YearIndependent.FastHVAC.Interfaces.EnthalpyPort_b	UnloadingCycle_Out
AixLib.Obsolete.YearIndependent.FastHVAC.Interfaces.EnthalpyPort_a	UnloadingCycle_In
AixLib.Obsolete.YearIndependent.FastHVAC.Interfaces.EnthalpyPort_a	port_HC1_in	Fluid connector a (positive design flow direction is from port_a to port_b)
AixLib.Obsolete.YearIndependent.FastHVAC.Interfaces.EnthalpyPort_b	port_HC1_out	Fluid connector b (positive design flow direction is from port_a to port_b)
AixLib.Obsolete.YearIndependent.FastHVAC.Interfaces.EnthalpyPort_a	port_HC2_in	Fluid connector a (positive design flow direction is from port_a to port_b)
AixLib.Obsolete.YearIndependent.FastHVAC.Interfaces.EnthalpyPort_b	port_HC2_out	Fluid connector b (positive design flow direction is from port_a to port_b)
Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a	heatingRod
Modelica.Blocks.Interfaces.RealOutput[n]	T_layers
Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_a	out

Components

Type	Name	Default	Description
Modelica.Units.SI.Energy	Heat_loss
Modelica.Thermal.HeatTransfer.Components.HeatCapacitor[n]	layer
AixLib.Obsolete.YearIndependent.FastHVAC.BaseClasses.EnergyBalance[n]	energyBalance_load
AixLib.Obsolete.YearIndependent.FastHVAC.BaseClasses.EnergyBalance[n]	energyBalance_unload
Modelica.Thermal.HeatTransfer.Sources.PrescribedTemperature[2]	varTemp_load
Modelica.Thermal.HeatTransfer.Sources.FixedHeatFlow[2]	dummy_load
Modelica.Thermal.HeatTransfer.Sources.PrescribedTemperature[2]	varTemp_unload
Modelica.Thermal.HeatTransfer.Sources.FixedHeatFlow[2]	dummy_unload
AixLib.Obsolete.YearIndependent.FastHVAC.Components.Storage.BaseClasses.HeatingCoil	heatingCoil1
AixLib.Obsolete.YearIndependent.FastHVAC.Components.Storage.BaseClasses.HeatingCoil	heatingCoil2
Fluid.Storage.BaseClasses.StorageCover	top_cover
Fluid.Storage.BaseClasses.StorageMantle[n]	storage_mantle
Fluid.Storage.BaseClasses.StorageCover	bottom_cover
HeatTransfer	heatTransfer

Name	Description
HeatTransfer

Revisions

December 20, 2016 Tobias Blacha:
Moved into AixLib
January 27, 2015 by Konstantin Finkbeiner:
Added documentation.
December 16, 2014 by Sebastian Stinner:
Implemented.