Heated Pipe - MapleSim Help

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Heated Pipe

Model of a pipe with heat exchange

 

Description

Connections

Variables

Parameters

Initial Conditions

Constants

See Also

Description

The Heated Pipe component is a two-port thermal-fluid component that models a pipe with friction loss, head loss, and heat exchange with a heat port. The equations are

&Delta;p&equals;&rho;ghg&plus; &Delta;plamVflowVFlam&plus;&lcub;kVflowVFlam2Vflow&gt;VFlamkVflow&plus;VFlam2Vflow<VFlam0otherwise

 

 

Qfric&equals; fLVflow&Delta;p

Qflow&equals;Qfric&plus;Qport

k &Delta;pnom&Delta;plamVFnomVFlamVFnomVFlam2

Tport&equals;Tq

 

 

Connections

Name

Description

flowPorta

Thermal-fluid flow port

flowPortb

Thermal-fluid flow port    

heatPort

Thermal port

Variables

Symbol

Units

Description

Modelica ID

&Delta;p

Pa

Pressure drop from a to b

dp

Qflow

W

Heat addition to flow in pipe

Q_flow

Qfric

W

Power loss due to friction in pipe    

Q_friction

Qport

W

Heat flow into heatport

heatPort.Q_flow

Tport

K

Temperature at heatport        

heatPort.T    

Tq

K

Temperature used for heat exchange with the ambient.  Depends on Ta, Tb, and Ttap.

T_q

Vflow

m3s

Volume flow from a to b

V_flow        

Parameters

Symbol

Default

Units

Description

Modelica ID

medium

fluidMedium

-    

Thermal-Fluid Media

medium

m

1

kg

Mass of medium in component

m

T0

293.15

K

Initial temperature

T0

tapT

1

0..1

Specifies averaging of temperatures at ports a and b

tapT

VFlam

0.    1

m3s

Laminar volume flow

V_flowLaminar

VFnom

1

m3s

Nominal volume flow

V_flowNominal

&Delta;plam

0.1

Pa

Laminar pressure drop

dpLaminar

&Delta;pnom

1

Pa

Nominal pressure drop

dpNominal

fL

0

-

Friction loss factor

frictionLoss

hg

0

m

Geodetic height increase from flowPorta to flowPortb

h_g

Initial Conditions

Symbol

Units

Description

Modelica ID

&Delta;p0

Pa

Initial pressure across device

dp

Qflow0

W

Initial heat addition to flow

Q_flow

Vflow0

m3s

Initial volumetric flow through device

V_flow

Constants

Symbol

Value

Units

Description

g

9.8066

ms2

Gravitation acceleration

See Also

Thermal Pipes and Valves

Thermal Overview

The components described in this topic are from the Modelica Standard Library. To view the original documentation, which includes author and copyright information, click here.

 

 

 

 

 


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