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## Simulation of condensation in a heat exchanger

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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
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