PlateHEXvle2vle L3 2ph ntu
Created Sunday 16 January 2022
A plate HX model with VLE medium at both sides. A block-geometry with corrugated plate is assumed.
1. Purpose of Model
This model is well suited to model transients of commonly designed condensers/evaporators in vapour cycles.
2. Level of Detail, Physical Effects Considered and Physical Insight
2.1 Level of Detail
Referring to Brunnemann et al. [1], this model refers to the level of detail L3 because the system is modelled with the use of balance equations applied to 2 VLE volumes (one on each side of the HX).
2.2 Physical Effects Considered
- dynamic conservation of energy (neglecting kinetic energy terms) in VLE flow (flow_a) and VLE flow (flow_b)
- dynamic conservation of mass (neglecting kinetic energy terms) in VLE flow (flow_a) and VLE flow (flow_b)
- taking static pressure differences due to friction losses and geostatic into account in VLE flow (flow_a) and VLE flow (flow_b)
- calculation of heat transfer resistance between the two flows is calculated applying corresponding HT model and considering plat wall conduction
- heat transfer losses to the ambience is supported via heat port
2.3 Level of Insight
Heat Transfer
- Basics:ControlVolumes:Fundamentals:HeatTransport:Generic HT:Constant L2 : All Geo || HTC || Constant
Pressure Loss
- Basics:ControlVolumes:Fundamentals:PressureLoss:Generic PL:LinearPressureLoss L2 : Linear pressure loss based on nominal values
Phase Separation
Basics:ControlVolumes:Fundamentals:SpatialDistributionAspects:IdeallyStirred : ideally mixed phases
Heat Exchanger Type
- Basics:ControlVolumes:SolidVolumes:Fundamentals:HeatExchangerTypes:CounterFlow
- Basics:ControlVolumes:SolidVolumes:Fundamentals:HeatExchangerTypes:CrossFlow
- Basics:ControlVolumes:SolidVolumes:Fundamentals:HeatExchangerTypes:ParallelFlow
3. Limits of Validity
4. Interfaces
4.1 Physical Connectors
ClaRa.Basics:Interfaces:FluidPortIn In_a
ClaRa.Basics:Interfaces:FluidPortOut Out_a
ClaRa.Basics:Interfaces:FluidPortIn In_b
ClaRa.Basics:Interfaces:FluidPortOut Out_b
5. Nomenclature
- no model specific nomenclature -
6. Governing Equations
6.1 System Description and General model approach
The combined model consists of the following components:
Basics:ControlVolumes:FluidVolumes:VolumeVLE L2 : plate (flow_a) with Plate geo record.
Basics:ControlVolumes:FluidVolumes:VolumeVLE L2 : plate (flow_b) with Plate geo record.
Basics:ControlVolumes:SolidVolumes:NTU plate L3 : plate wall
VLE one cell (in both flows, i.e. flow_a and flow_b) are used to describe the HX in flow direction.
Summary
A summary record is available which bundles important component values.
7. Remarks for Usage
8. Validation
9. References
[1] Johannes Brunnemann and Friedrich Gottelt, Kai Wellner, Ala Renz, André Thüring, Volker Röder, Christoph Hasenbein, Christian Schulze, Gerhard Schmitz, Jörg Eiden: "Status of ClaRaCCS: Modelling and Simulation of Coal-Fired Power Plants with CO2 capture", 9th Modelica Conference, Munich, Germany, 2012
[2] VDI Wärmeatlas, Verein Deutscher Ingenieure VDI-Gesellschaft Verfahrenstechnik und Chemieingenieurwesen (GVC), Springer Verlag, 10. Auflage, 2006
10. Authorship and Copyright Statement for original (initial) Contribution
Author:
ClaRa development team, Copyright 2017 - 2022.
Remarks:
This component was developed for ClaRa library.
Acknowledgements:
CLA:
11. Version History
Date - Version - Description of changes - author/revisor
17.01.2022 - v0.1 - initial implementation of the model - Ales Vojacek, XRG Simulation
Backlinks: ClaRa:A User Guide:Revisions:v1.8.0