At CDES, our team of design engineers develops 3D CAD solid models that can be used for simulation and analysis ensuring shorter and cost effective product development.
At CDES, our team of design engineers develops 3D CAD solid models that can be used for simulation and analysis ensuring shorter and cost effective product development.
dsaFull description
minimum technical requirements for the design, supply, storage, application and inspection of thermal and acoustic insulation of pipe work and equipment for onshore and offshore oil and gas explora...Full description
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SYSTEM AND EQUIPMENT ISOLATIONDescription complète
minimum technical requirements for the design, supply, storage, application and inspection of thermal and acoustic insulation of pipe work and equipment for onshore and offshore oil and gas explora...
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The ultimate purpose of a finite element analysis is to recreate mathematically the behavior of an actual engineering system. In other words, the analysis must be an accurate mathematical m…Descripción completa
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DYNSIM OTS Training Course 5.- DYN DYNSIM SIM Mod Modell elling ing:: Equipment and Streams
5.- DYNSIM Modelling: Equipment and Streams •
DYNSIM Equipment Models
•
DYNSIM Streams
2
DYNSIM Equipment Models •
•
Pressure Nodes Flow Devices
DYNSIM Pressure Nodes •
Source
•
Sink
•
Header
•
Drum
•
Separator
•
Fired Heater (Gas Side)
•
Tank
•
Column (Legacy)
•
Tower
Multiple inputs and outputs Can leave models unconnected
4
Pressure Nodes: Common Features •
Pressure Nodes set pressure. They do not set flows
Pressure Nodes: Equipment Connection In DYNSIM, Pressure Node devices and equipment can not be connected together. There must be at least one Flow Device object connecting pressure nodes
6
DYNSIM Flow Devices • Valve
• Expander
• Relief
Valve
• Heat
Exchanger
• Pipe
• Utility
• Centrifugal
• Combustor
Compressor • Reciprocating
Compressor • Pump • Slate
Exchanger
• Fired
Heater (Pipe Side)
• Multi
Exchanger
• Stream
Set
Change Single input and single output Can leave models unconnected
7
Flow Devices Common Features •
Flow devices set flows. They do not set pressures
•
One inlet and one exit stream
•
Reverse Flow possible on all flow devices
•
Flow Devices do not typically include holdup –
Pipe and Heat Exchangers are exceptions
• Most use a conductance named “ J” to relate flow and
pressure drop W
J
P R MASS
8
Flow Devices: Equipment Connection Flow Devices can be connected together. These are all legal
9
DYNSIM Streams •
•
•
Stream Types Process Stream Structure Flow Device Properties Calculations
Stream Types •
Process Streams –
•
Mechanical Streams –
•
Connect rotating equipment
Heat Streams –
•
Enthalpy based, not temperature based
Connect utility exchanger
Electrical Streams –
Connect current and voltage
Note that Controls are connected by parameter connections (when graphical) or references, not streams In DYNSIM Power, stream are not drawn most of the times, just the reference is added to the object (OEV) 11
Stream Types
Pressure Nodes to Flow Devices Flow devices to Flow Devices Supports Reverse Flow
Motor or Shaft to Pump, Compressor Expander to Shaft
Utility Exchanger to Drum, Separator, Pipe, or Header
Electric Devices
12
Stream Bi-Directional Data Transfer Resistance
Capacitance
calc flux
calc potential Flow
Process:
Flow Device
Pressure
Pressure Node
Power
Mechanical:
Rotating Equip Speed
Shaft/Motor
Duty
Heat:
Utility Exchanger
Temperature
Drum
Current
Electrical:
Motor
Voltage
Bus
Note the analogy in that every stream passes a “potential” in one direction and a “flux” in the other direction. 13
Process Stream Structure • Stream
Parameters
–
F
–
Z (mole fraction array)
–
T
–
P
–
H (enthalpy
–
VF (vapor fraction)
–
MW
–
R (molar density)
–
W (mass flow)
• Energy
defined by H not T
• Flow
device T, R, and VF may only be accurate if the upstream model calculates downstream properties. If not they are just copied from the upstream properties
• Properties
are in the direction of flow or based on continuity
14
Reverse Flow and Continuity •
Continuity is a simple method to calculate stream parameters
•
If accurate temperature dynamics is required between valves, add a pipe model with holdup
•
Flow device flashes are the same as the outlet streams.
•
°
H1.FLASH.T 400 C
°
H1.FLASH.T 300 C
H1
H2
See Parameter WLIN in troubleshooting section
S1
S2
°
S1.T 350 C
°
S2.T 350 C
S1.T
S2.T
Forward Flow
400 C
400 C
Reverse Flow
300 C
300 C
Zero Flow Valve Open
350 C
350 C
Zero Flow Valve Closed
400 C
300 C
°
°
°
°
°
°
°
°
15
Flow Device Properties Calculations •
Flow devices set their outlet stream properties. By default most flow devices set outlet properties equal to inlet properties V1
S1
Calculate outlet properties (V1.FlashFlag) here to perform adiabatic flash to get accurate S2.T, S2.R, S2.VF
V2
S2
S2.R will be used for V2 flow calculation
S3
Valves are isenthalpic, so FlashFlag will have no affect on the simulation energy balance
