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Simulation of condensation in a heat exchanger

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Simulation of condensation in a heat exchanger – PowerPoint PPT presentation

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Title: Simulation of condensation in a heat exchanger


1
Simulation of condensation in a heat exchanger
Group Seminar, Division of heat transfer,
LTH December 6th, 2005
  • Charlotte Wilhelmsson
  • Division of Heat Transfer
  • Lund Institute of Technology

2
Outline
  • Project description
  • Background
  • Methods
  • Equations
  • Future

3
Project Description
  • Project Title
  • Simulation of condensation in a heat exchanger
  • Background
  • It is interesting to conduct some numerical work
    to gain some insight for this process, although
    may not fully predict it.
  • Project is mainly sponsored by STEM, but in
    cooperation with Alfa Laval.

4
Plate heat exchanger
5
Introduction
  • The application of PHEs in process industries
    have been significantly enlarged, due to
  • Compactness
  • Effectiveness
  • Cost competitiveness
  • Traditional PHE are plate-and-frame heat
    exchanger
  • Temperature limit 160 ºC
  • Pressure limit 25 bar

6
Condensation
  • Involves a phase change
  • Saturated vapour such a steam comes in
    contact with a solid whose surface temperature is
    below the saturation temperature.
  • Normally when vapour condensates on a surface, a
    film condensate is formed on the surface and
    flows over the surface by the action of gravity.

7
Methods
  • Possible methods
  • Pure CFD
  • Simplified numerical model
  • Analytical solution

8
Original equations Condensate film
9
Original equations Vapour flow
10
New coordinates
  • Liquid phase
  • Vapour phase

11
Liquid layer
1.
2.
3.
12
Vapour layer
1.
2.
13
Boundary conditions
  • TV TS
  • At the wall
  • UL0
  • VL0
  • TLTW
  • At the liquid vapour interface
  • UL UV
  • ?LVL ?VUV

14
What I have been doning since August
  • Start to use the CALC-code for my project
  • Teaching the course Thermodynamics and Fluid
    dynamics
  • Styding the course Convective boiling and
    condensation

15
The CALC-code
  • Finite volume computer code
  • For prediction of mass, heat and momentum
    transfer
  • Utilizes a general non-orthogonal boundary fitted
    coordinate system
  • Steady/unsteady, three-dimensional,
    turbulent/laminar recirkulating flows

16
My case
  • Change from horizontal to vertical
  • Implement data for water, hydrogen and air
  • Implement two-phase flow and phase-change

17
U-velocity
18
Temperature
19
Future work
  • Implement condensation in CALC-code

20
  • Thank you very much
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