modelDynamicOnePhaseFlowPipe

Dynamic one-phase flow pipe

Extends from ThermoSysPro.Fluid.Interfaces.IconColors (Colors of the static, singular and dynamic model icons).

Information

## Copyright © EDF 2002 - 2026   
## ThermoSysPro Version 4.2

Parameters

Type	Name	Default	Description
Units.SI.Length	L	10.	Pipe length
Units.SI.Diameter	D	0.2	Internal pipe diameter
Real	rugosrel	0.0007	Pipe relative roughness
Integer	ntubes	1	Number of pipes in parallel
Units.SI.Position	z1	0	Pipe inlet altitude
Units.SI.Position	z2	0	Pipe outlet altitude
Real	CSailettes	1	Increase/decrease factor of the heat exchange surface for solar receiver or boiler
Real	dpfCorr	1.00	Corrective term for the friction pressure loss (dpf) for each node
Real	hcCorr	1.00	Corrective term for the heat exchange coefficient (hc) for each node
Integer	Ns	10	Number of segments
Units.SI.AbsolutePressure	P0	1.e5	Fluid initial pressure (active if steady_state = false)
Units.SI.Temperature[Ns]	T0	fill(290, Ns)	Initial fluid temperature (active if steady_state = false and option_temperature=true)
Units.SI.SpecificEnthalpy[Ns]	h0	fill(1e5, Ns)	Initial fluid specific enthalpy (active if steady_state = false and option_temperature=false)
Boolean	inertia	true	true: momentum balance equation with inertia - false: without inertia
Boolean	advection	false	true: momentum balance equation with advection terme - false: without advection terme
Boolean	dynamic_energy_balance	true	true: dynamic energy balance equation - false: static energy balance equation
Boolean	dynamic_mass_balance	true	true: dynamic mass balance equation - false: static mass balance equation (active if dynamic_energy_balance=true)
Boolean	simplified_dynamic_energy_balance	true	true: simplified dynamic energy balance equation - false: full dynamic energy balance equation (active if dynamic_energy_balance=true and dynamic_mass_balance=true)
Boolean	steady_state	true	true: start from steady state - false: start from T0 (if option_temperature = true) or h0 (if option_temperature=false)(active if dynamic_energy_balance=true)
Boolean	option_temperature	true	true: initial temperature is fixed - false: initial specific enthalpy is fixed (active if steady_state=false)
Boolean	continuous_flow_reversal	false	true: continuous flow reversal - false: discontinuous flow reversal
Boolean	diffusion	false	true: energy balance equation with diffusion - false: energy balance equation without diffusion
Fluid › Fluid properties
IF97Region	region	IF97Region.All_regions	IF97 region (active for IF97 water/steam only)

Connectors

Type	Name	Default	Description
ThermoSysPro.Fluid.Interfaces.Connectors.FluidInlet	C1
ThermoSysPro.Fluid.Interfaces.Connectors.FluidOutlet	C2
ThermoSysPro.Thermal.Connectors.ThermalPort[Ns]	CTh

Components

Type	Name	Default	Description
Units.SI.AbsolutePressure[N + 1]	P		Fluid pressure in node i
Units.SI.MassFlowRate[N]	Q		Mass flow rate in node i
Units.SI.SpecificEnthalpy[N + 1]	h		Fluid specific enthalpy in node i
Units.SI.SpecificEnthalpy[N]	hb		Fluid specific enthalpy at the boundary of node i
Units.SI.Density[N - 1]	rho1		Fluid density in thermal node i
Units.SI.Density[N]	rho2		Fluid density in hydraulic node i
Units.SI.Density[N + 1]	rhoc		Fluid density at the boudary of node i
Units.SI.MassFlowRate[N - 1]	BQ		Right hand side of the mass balance equation for thermal node i
Units.SI.Power[N - 1]	BH		Right hand side of the energy balance equation for thermal node i
Units.SI.Power[N - 1]	dW1_conv		Convection thermal power exchanged on the liquid side for node i
Units.SI.Power[N - 1]	dW1_diff		Diffusion thermal power exchanged on the liquid side for node i
Units.SI.Power[N - 1]	dW1		Thermal power exchanged on the water side for node i
Units.SI.Power	W1t		Total power exchanged on the water side
Units.SI.Temperature[N - 1]	Tp		Wall temperature in node i
Units.SI.CoefficientOfHeatTransfer[N - 1]	hc		Fluid heat exchange coefficient in node i
Units.SI.ReynoldsNumber[N - 1]	Re1		Fluid Reynolds number in thermal node i
Units.SI.ReynoldsNumber[N]	Re2		Fluid Reynolds number in hydraulic node i
Real[N - 1]	Pr		Fluid Prandtl number in node i
Units.SI.ThermalConductivity[N - 1]	k1		Fluid thermal conductivity in thermal node i
Units.SI.ThermalConductivity[N]	k2		Fluid thermal conductivity in hydraulic node i
Units.SI.DynamicViscosity[N - 1]	mu1		Fluid dynamic viscosity in thermal node i
Units.SI.DynamicViscosity[N]	mu2		Fluid dynamic viscosity in hydraulic node i
Units.SI.SpecificHeatCapacity[N - 1]	cp1		Fluid specific heat capacity in thermal node i
Units.SI.SpecificHeatCapacity[N]	cp2		Fluid specific heat capacity in hydraulic node i
Units.SI.Temperature[N - 1]	T1		Fluid temperature in thermal node i
Units.SI.Temperature[N]	T2		Fluid temperature in hydraulic node i
ThermoSysPro.Units.SI.PressureDifference[N]	dpa		Advection term for the mass balance equation in node i
ThermoSysPro.Units.SI.PressureDifference[N]	dpf		Friction pressure loss in node i
ThermoSysPro.Units.SI.PressureDifference[N]	dpg		Gravity pressure loss in node i
Real[N]	khi		Hydraulic pressure loss coefficient in node i
Real[N]	lambda		Friction pressure loss coefficient in node i
Units.SI.DerDensityByPressure[N - 1]	ddph		Density derivative wrt. pressure
Units.SI.DerDensityByEnthalpy[N - 1]	ddhp		Density derivative srt. enthalpy
FluidType	ftype		Fluid type
Integer	fluid	Integer(ftype)	Fluid number
ThermoSysPro.Units.SI.MassFraction	Xco2		CO2 mass fraction
ThermoSysPro.Units.SI.MassFraction	Xh2o		H2O mass fraction
ThermoSysPro.Units.SI.MassFraction	Xo2		O2 mass fraction
ThermoSysPro.Units.SI.MassFraction	Xso2		SO2 mass fraction
Real[N]	diff_res		Diffusion resistance in hydraulic node i
Real	diff_res_t		Total diffusion resistance in the pipe
Real[N - 1]	diff_res_e		Diffusion resistance at inlet of thermal node i
Real[N - 1]	diff_res_s		Diffusion resistance at outlet of thermal node i
Units.SI.MassFlowRate[N]	gamma		Total diffusion conductance in hydraulic node i
Units.SI.MassFlowRate[N - 1]	gamma_e		Diffusion conductance at inlet of thermal node i
Units.SI.MassFlowRate[N - 1]	gamma_s		Diffusion conductance at outlet of thermal node i
Units.SI.Power[N - 1]	Je		Thermal power diffusion from inlet of thermal node i
Units.SI.Power[N - 1]	Js		Thermal power diffusion from outlet of thermal node i
Units.SI.Power[N - 1]	J		Total thermal power diffusion of thermal node i
Real[N - 1]	re		Value of r(Q/gamma) for inlet of thermal node i
Real[N - 1]	rs		Value of r(Q/gamma) for outlet of thermal node i

Revisions

Authors  

Daniel Bouskela  
Baligh El Hefni