Example - AIR - AIR heat exchanger
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Type |
without shell compensator |
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Floor panels |
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Type of base plate |
Program specification |
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in section 1: |
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Storage |
fixed |
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Thickness |
44 mm |
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in section M: |
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Storage |
fixed |
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Thickness |
44 mm |
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Coat |
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Cross section |
circular |
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Inner diameter d1 |
894 mm |
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Outer diameter d2 |
914 mm |
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Tubes |
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Outer diameter da |
25 mm |
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Inner diameter di |
21 mm |
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Total length lR |
4100 mm |
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Socket |
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Cross section |
circular |
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Entry spigot |
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Clearance between the center of the entry spigot and the first base plate lS |
420 mm |
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Inner diameter dS |
392,2 mm |
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Outlet nozzle |
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Clearance from nozzle center to base plate lS |
420 mm |
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Inner diameter dS |
392,2 mm |
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Position of the outlet nozzle |
below |
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Baffles |
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Diameter dU |
890 mm |
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Number nU |
4 |
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Thickness b |
10 mm |
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Height of the cutout baffle / jacket HU |
320,05 mm |
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or d u.x |
35,8 % |
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Distances between the baffles |
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lU(1) |
806 mm |
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lU(2) |
800 mm |
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lU(3) |
800 mm |
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lU(4) |
800 mm |
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lU(5) |
806 mm |
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Bore diameter for the tubes |
25,4 mm |
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Coat |
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Modulus of elasticity EM |
20000 N/mm² |
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linear coefficient of thermal expansiongM |
16 10 -6/K |
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Transverse contraction coefficient |
0,28 |
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Difference between mean wall temperature in operation and in the de-energized installation state |
-2 K |
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Tubes |
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Modulus of elasticity ER |
20000 N/mm² |
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linear coefficient of thermal expansion gR |
15,5 10 -6/K |
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Density rR |
7980 kg/m³ |
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Transverse contraction coefficient |
0,28 |
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Difference between mean wall temperature in operation and in the de-energized installation state |
5 K |
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Fluid in jacket space |
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Flow sections 1 - 5 |
constant |
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Density r |
10.18 kg/m³ |
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Aggregate state |
gaseous |
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Gas volume fraction |
1 |
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Viscosity |
1.792 10 -6 m²/s |
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Overpressure pa |
7,5 bar |
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Fluid in jacket space |
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Flow sections 1 - 5 |
constant |
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Density r |
10.25 kg/m³ |
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Overpressure pi |
8 bar |
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Operating data |
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Inlet volume flow |
0.9 m³/s |
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Pipe mirror input |
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Pipe pitch angle |
30° |
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Pipe pitch ratio t |
1,3 |
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or pipe pitch |
32,5 mm |
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Enveloping circle diameter |
875 mm |
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missing pipe rows above |
0 |
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missing pipe rows center |
0 |
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missing pipe rows below |
0 |
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exists a center tube |
ticked |
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Calculate all pipe rows |
ticked |
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No support grids or partial support grids were provided.
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Speed distribution |
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Velocity model for all flow sections |
Program specification |
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Natural frequency and mode of vibration |
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Examine multiple natural frequencies |
ticked |
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Natural frequency to be investigated for mode i |
6 |
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Vortex and turbulence excitation |
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Calculation of vortex and turbulence excitation |
ticked |
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No optional defaults selected.
Start the calculation by selecting the "Calculation / Start" menu (CTRL-R)
Start the calculation by selecting the "Calculation / Start" menu (CTRL-R)
A new window will open with the results, the first page contains a summary.
For interpretation of the results, see output descriptions . In this example, the bundle is at risk of vibration due to fluid elastic instability. Degree of hazard 114.3 %.
