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Fluid Properties Check

Accessory component to check Fluid properties

 

Description

Equations

Variables

Connections

Parameters

See Also

Description

The Fluid Properties Check component models Air fluid properties calculation.

Before using HeatConvection component and components in Air and Water subpackage, you can check how to calculate fluid properties

which are used for the component internally.

And, if you'd like to define your own definition for the heat transfer coefficient calculation, this component is helpful to get the fluid properties.

Equations

Average temperature is :

T=Tin1Tin22

Type of Media = Actual Air (CoolProp)

Density of Air calculated from pressure and temperature :

ρ=Function__ρpin, Tin1

(Function__ρ call a function of CoolProp library internally)

Specific enthalpy of Air calculated from pressure and temperature :

hflow=Function__hflowpin, Tin1
(Function__hflow call a function of CoolProp library internally)

Viscosity of Air calculated from pressure and temperature is :

μ=Function__μpin, Tin1(Function__μ call a function of CoolProp library internally)

Thermal conductivity of Air calculated from pressure and temperature is :

k=Function__kpin, Tin1(Function__k call a function of CoolProp library internally)

Specific heat capacity at the constant pressure of Air calculated from pressure and temperature is :

c__p=Function__c__ppin, Tin1

(Function__c__p call a function of CoolProp library internally)

Reynolds number of Air calculated from pressure and temperature is :

Re=Function__Repin, Tin1, Tin2, X, Vin

( Re=ρVinXμ, and ρ and μ is calculated from pin and T )

Prandtl number of Air calculated from pressure and temperature is :

Pr=Function__Prpin, Tin1, Tin2, X

( Pr=c__pμk, and c__p and μ and k is calculated from pin and T )

Grashof number of Air calculated from pressure and temperature is :

Gr=Function__Grpin, Tin1, Tin2,9.81, X

( Gr=gβT[1]T[2]X3μ2, and g=9.81, β=1T,μ and ρ is calculated from pin and T )

Type of Media = Ideal Air (NASA Poly)  

Density of Air calculated from pressure and temperature :

ρ=pinR__gasTin1

Specific enthalpy of Air calculated from pressure and temperature :

hflow=Function__hflowTin1
(Function__hflow call a function of a NASA Polynomial internally)

Viscosity of Air calculated from pressure and temperature is :

μ=Function__μTin1(Function__μ call a fitted equation internally)

Thermal conductivity of Air calculated from pressure and temperature is :

k=Function__k Tin1(Function__k call a fitted equation internally)

Specific heat capacity at the constant pressure of Air calculated from pressure and temperature is :

c__p=Function__c__pTin1

(Function__c__p call a function of NASA Polynomial internally)

Reynolds number of Air calculated from pressure and temperature is :

Re=Function__ReTin1, Tin2, X, Vin

( Re=ρVinXμ, and ρ and μ is calculated from T )

Prandtl number of Air calculated from pressure and temperature is :

Pr=Function__PrTin1, Tin2, X

( Pr=c__pμk, and c__p and μ and k is calculated from T )

Grashof number of Air calculated from pressure and temperature is :

Gr=Function__GrTin1, Tin2,9.81, X

( Gr=gβT[1]T[2]X3μ2, and g=9.81, β=1T,μ and ρ is calculated from T )

Type of Media = Simple Air (Constant)  

Density of Air calculated from pressure and temperature :

ρ=pinR__gasTin1

Specific enthalpy of Air calculated from temperature :

hflow=c__pT+hflow__off

hflow__off=124648.4919

Viscosity of Air is a constant μ.

Thermal conductivity of Air is a constant k.

Specific heat capacity at the constant pressure of Air is a constant c__p.

Reynolds number of Air is :

Re=ρVinXμ

Prandtl number of Air is :

Pr=c__pμk

Grashof number of Air is :

Gr=9.811TT[1]T[2]X3μ2

Type of Media = Water (IAPWS/IF97)  

Density of Water calculated from pressure and temperature :

ρ=Function__ρpin, Tin1

(Function__ρ call a function of Modelica.Media.Water,IAPWS/IF97, internally)

Specific enthalpy of Air calculated from pressure and temperature :

hflow=Function__hflowpin, Tin1
(Function__hflow call a function of Modelica.Media.Water,IAPWS/IF97, internally)

Viscosity of Air calculated from pressure and temperature is :

μ=Function__μpin, Tin1(Function__μ call a function of Modelica.Media.Water,IAPWS/IF97, internally)

Thermal conductivity of Air calculated from pressure and temperature is :

k=Function__kpin, Tin1(Function__k call a function of Modelica.Media.Water,IAPWS/IF97, internally)

Specific heat capacity at the constant pressure of Air calculated from pressure and temperature is :

c__p=Function__c__ppin, Tin1

(Function__c__p call a function of Modelica.Media.Water,IAPWS/IF97, internally)

Reynolds number of Air calculated from pressure and temperature is :

Re=Function__Repin, Tin1, Tin2, X, Vin

( Re=ρVinXμ, and ρ and μ is calculated from pin and T )

Prandtl number of Air calculated from pressure and temperature is :

Pr=Function__Prpin, Tin1, Tin2, X

( Pr=c__pμk, and c__p and μ and k is calculated from pin and T )

Grashof number of Air calculated from pressure and temperature is :

Gr=Function__Grpin, Tin1, Tin2,9.81, X

( Gr=gβT[1]T[2]X3μ2, and g=9.81, β=1T,μ and ρ is calculated from pin and T )

Type of Media = Liquid water (Lookup table of IAPWS/IF97)  

Density of Air calculated from pressure and temperature :

ρ=LUT__ρpin, Tin1

(LUT__ρ is a lookup table which is generated with Modelica.Media.Water, IAPWS/IF97)

Specific enthalpy of Air calculated from pressure and temperature :

hflow=LUT__hflowpin, Tin1
(LUT__hflow is a lookup table which is generated with Modelica.Media.Water, IAPWS/IF97)

Viscosity of Air calculated from pressure and temperature is :

μ=LUT__μpin, Tin1(LUT__μ is a lookup table which is generated with Modelica.Media.Water, IAPWS/IF97)

Thermal conductivity of Air calculated from pressure and temperature is :

k=LUT__kpin, Tin1(LUT__k is a lookup table which is generated with Modelica.Media.Water, IAPWS/IF97)

Specific heat capacity at the constant pressure of Air calculated from pressure and temperature is :

c__p=LUT__c__ppin, Tin1

(LUT__c__p is a lookup table which is generated with Modelica.Media.Water, IAPWS/IF97)

Reynolds number of Air calculated from pressure and temperature is :

Re=ρVinXμ

Prandtl number of Air calculated from pressure and temperature is :

Pr=c__pμ)

Grashof number of Air calculated from pressure and temperature is :

Gr=gβT[1]T[2]X3μ2

β=1T

Type of Media = Simple Air (Constant)  

Density of Water calculated from pressure and temperature :

ρ=pinR__gasTin1

Specific enthalpy of Water calculated from temperature :

hflow=c__pT+hflow__off
hflow__off=1142798.49977

Viscosity of Air is a constant μ.

Thermal conductivity of Water is a constant k.

Specific heat capacity at the constant pressure of Water is a constant c__p.

Reynolds number of Water is :

Re=ρVinXμ

Prandtl number of Water is :

Pr=c__pμk

Grashof number of Water is :

Gr=9.811TT[1]T[2]X3μ2

 

Outputs are :

out1=ρ

out2=hflow

out3=μ

out4=k

out5=c__p

out6=Re

out7=Pr

out8=Gr

 

Variables

Symbol

Units

Description

Modelica ID

T__

K

Averaged temperature between Tin[1] and Tin[2]

 

ρ

kgm3

Density of Air

 

μ

m2s

Dynamic viscosity of Air

 

k

WmK

Thermal conductivity of Air

 

c__p

JkgK

Specific heat capacity at the constant pressure of Air

 

Re

Reynolds number

 

Pr

Prandtl number

 

Gr

Grashof number

 

g

ms2

Acceleration of gravity

 

β

1K

Volume coefficient of expansion

 

 

Connections

Name

Units

Condition

Description

Modelica ID

pin

Pa

-

Pressure input

pin

Tin2

K

-

Temperature inputs

Tin[2]

Vin

ms

-

Wind speed

Vin

out8

-

-

Air fluid properties

1 : Density

2 : Specific enthalpy

3 : Dynamic viscosity

4 : Thermal conductivity

5 : Specific heat capacity at the constant pressure

6 : Reynolds number

7 : Prandtl number

8 : Grashof number

out[8]

Parameters

Symbol

Default

Units

Description

Modelica ID

Type of Media

Actual Air CoolProp

Select type of media

 - Actual Air (CoolProp)

 - Ideal Air (NASA Poly)

 - Simple Air (Constant)

 - Water (IAPWS/IF97)

 - Liquid Water (Lookup table of IAPWS/IF97)

 - Simple Water (Constant)

TypeOfMedia

X

1.0

m

Streamwise length

X

See Also

Heat Transfer Library Overview

Properties Overview