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Valve

Simple valve

 

Description

Connections

Variables

Parameters

Initial Conditions

See Also

Description

The Valve component is a two-port thermal-fluid component that models a simple valve. A boolean parameter selects one of two characteristics: linear or exponential. The equations are

KvKv1=kv0 + (1kv0)ylimy1LinearCharacteristic=truekv0exp(ln(1kv0)ylimy1)otherwise

ΔpΔp0=ρρ0VflowKvVflowKv

Qflow=fLΔpVflow

ylim=maxminy,y1,0

Connections

Name

Description

flowPorta

Thermal-fluid flow port

flowPortb

Thermal-fluid flow port    

y

Real signal input that controls the valve

Variables

Symbol

Units

Description

Modelica ID

Δp

Pa

Pressure drop from a to b

dp

Qflow

W

Heat addition to flow in pipe

Q_flow

Vflow

m3s

Volume flow from a to b

V_flow            

ylim

-

Bounded signal that controls valve

yLim

Parameters

Symbol

Default

Units

Description

Modelica ID

medium

fluidMedium

-    

Thermal-Fluid Media

medium

m

0

kg

Mass of medium in component

m

T0

293.15

K

Initial temperature

(parameter hidden when m=0)

T0

Linear Characteristic

true

-

Specifies whether component uses the linear or exponential equations

LinearCharacteristic

y1

1

-

Maximum valve opening

y1

Kv1

1

m3s

Maximum flow at y=y1

Kv1

kv0

0.01

Leakage flow / max. flow, at y&equals;0.  0<kv0<1

kv0

&Delta;p0

1

Pa

Standard pressure drop

dp0

&rho;0

10

kgm3

Density of standard medium

rho0

fL

0

-

Friction loss factor

frictionLoss

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

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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