modelHeatingPipe

Model of a heating distribution netwrok. Pipe model using a 1-D fluid flow model (finite volume discretization - incompressible fluid model).

Information

The fluid in the heating pipes from the greenhouse heating ciruit is modeled by means of the discretized model for incompressible flow (Flow1DimInc), in which a dynamic energy balance and static mass and momentum balances are applied on the fluid cells. Heat is transferred by long-wave radiation to the canopy, floor and cover, and by convection to the air. The heat transfer is set to be computed by an ideal model. However, the user can select other heat transfer models in the parameters of the fluid flow model.

Greenhouse heating circuits are commonly made of several parallel heating loops. The user must set the physical characteristics of the circuit (i.e. the number of parallel loops, the pipes diameter, the installed length per loop and the nominal mass flow rate) and the number of nodes in which a loop is discretized.

Parameters

TypeNameDefaultDescription
IntegerN_p1number of cells in parallel
IntegerN2number of cells
Modelica.Units.SI.Diameterdpipe diameter
Modelica.Units.SI.Lengthllength of heating pipes
Modelica.Units.SI.AreaAGreenhouse floor surface
BooleanfreePipetruetrue if pipe in free air, false if hindered pipe
Modelica.Units.SI.MassFlowRateMdotnom0.528Nominal mass flow rate of the pipes

Connectors

TypeNameDefaultDescription
Interfaces.Heat.HeatPorts_aheatPorts
Modelica.Fluid.Interfaces.FluidPort_apipe_in
Modelica.Fluid.Interfaces.FluidPort_bpipe_out

Components

TypeNameDefaultDescription
Modelica.Units.SI.AreaA_PipeFloorpipe external area
Realc
RealFF
Flows.FluidFlow.Flow1DimIncflow1DimInc