  HEAT
PIPE
A heat pipe is a simple device that can quickly transfer
heat from one point to another without the need of energy
input. Heat pipes are often referred to as the "superconductors" of
heat as they possess an extraordinary heat transfer capacity
with almost no loss. The heat pipe itself is not a new
invention; early heat pipes, developed near the turn of
the century, were constructed out of hollow metal tubes
which were sealed at both ends, vacuumed and charged with
a small amount of evaporative fluid. They contained a "wick" to
transport the fluid from one end of the heat pipe to the
other. Relying on the energy absorbed and released from
the "phase-change" of the fluid, the hollow heat pipe transfers
heat at extremely high speed. Heat applied to one end of
the pipe would instantaneously evaporate the fluid inside.
This vapor would then move to the other "colder" end of
the pipe and condense back to liquid form, releasing the
heat absorbed during the evaporation. Heat pipe is able
to transfer heat thousands of times faster than a solid
copper rod, but it was considered too expensive for commercial
uses due to its complex wick construction. Therefore, heat
pipes were limited to mostly scientific and exotic applications
such as those use in the space industry.
APPLICATION OF HEAT PIPE TO WASTE HEAT RECOVERY BOILER
 Hamada Boiler
has developed a very unique waste heat recovery boiler
with the application of heat pipe to recover heat energy
from the waste exhaust gas of Diesel Engine Generator.
Exhaust gas temperature varies from 300 - 400 °C in
most of Diesel Generator. If conventional type of boiler
is used which heat transfer rely on the heat conductivity
through the boiler tube, size of the boiler will become
very big and usually the air-resistance will be above 100
mmH20. With the application of heat pipe technology, we have made the
boiler far smaller than the conventional model with air-resistance far
below 100 mmH20 which is important for prevention of back-fire of the
Diesel Engine.
 INSTALLATION
OF HEAT PIPE WASTE RECOVERY BOILER at
Textile Printing Factory in Indonesia PT.
INDONESIA ASAHI CHEMICAL INDUSTRY,
Jati Luhur, Purwakarta, Jawa Barat (Japanese Foreign Investment
Company)
Diesel Generator : 3 units total of 3800 KW (YANMAR BRAND)
Hamada Heat Pipe Boiler Model CRG-1522
Steam Evaporation Rate : 2200 Kg/h saturated steam 6Kg/cm2
pressure
ENERGY SAVING: 2.2 ton steam/h x US$10 (cost of steam/ton)=US$22.00/hour
Heat
transfer by latent heat of water inside the heat pipe
SURPRISINGLY HIGH HEAT TRANSFER COEFFICIENCY
|
[SAMPLE CASE]
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|
1,000,000 Kcal/H heat transfer to evaporation
Diesel Generator Capacity : 2250 KW
Exhaust gas temperature : 350 - 400 °C
Hamada Heat Pipe Boiler Model CRG-1015
Heating Surface: 200 M2
Number of finned tube : 138 pcs. Finned Tube Length: 3000 mm (1500
mm bared tube 1500 mm finned tube) dia.of tube OD32 mm x t3 mm Finne
size: 64 mm x t1.2 mm p4.8 mm |
