Prof.
Milind V. Rane
Tube-Tube
Heat Exchanger (TTHE)
A tube-tube heat exchanger (TTHE) is a
double wall tubular heat exchanger wherein two or more
tubes are placed side-by-side and bounded thermally
using thermal bonding material (TBM) for effective transfer
of heat. Use of bends and straight lengths in tube-tube
heat exchanger result in significant enhancement in
heat transfer due to secondary flows induced in the
bends. The secondary flows induced in bend leads to
heat transfer enhancement in bend as well as in straight
length downstream of bend without significant increase
in pressure drop.
TTHE can be used for heat recovery from engine cooling
circuit, gas turbine lube oil cooling, desuperheating
in refrigeration and air conditioning , dairy and pharmaceutical
industry, chemical industry, refinery etc.
OUTSTANDING FEATURES
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Novel Modular
Design : hence no limits for capacity |
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Vented Double Wall
Construction: essential feature for applications
requiring safety against mixing of fluid streams |
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High Heat Transfer
Coefficients: heat exchanger can be optimized
for high heat transfer coefficients at low pressure
drops using the flexibility of choosing he size
of the tubes, shape and number of tubes on each
side to maintain required velocity and heat transfer
area ratio between the two sides |
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Low Fluid Hold-up:
high heat transfer coefficients, small tube diameters
coupled with and reduced number and size of headers
lead to very low inventory comparable to that of
plate heat exchangers |
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Material of Construction:
wide choice of MOC, choice for use of different
tube materials according to fluid type e.g. corrosive,
erosive, fouling, viscous etc. |
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Easy to Maintain:
Can be cleaned using clean-in-place technique by
Chemical Descaling Fluids. |
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Simple Construction:
Hence easy to fabricate. |
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