Heat pipe by Harish Surodkar

1. Seminar on : Anyalsis Of Heat Pipes.
Presented By : Harish S.Surodkar . Guided By: Roshan Marode Sir.
Mauli College of Engineering andTechnology ,Shegaon

2. Heat Pipe
Seminar
On
Heat Pipes

3.  Introduction
 Literature Review
 Components of a heat pipe
 Working
 The prime requirements
 Construction
 Types
 Application
 Advantages
 Conclusion
 References

4.  A heat pipe is a device that efficiently transports thermal
energy from its one point to the other.
 It utilizes the latent heat of the vaporized working fluid
instead of the sensible heat.
 As a result, the effective thermal conductivity may be
several orders of magnitudes higher than that of the good
solid conductors.

5.  The concept of the heat pipe was first introduced
by Gaugler in 1942 (Dunn and Reay, 1982).
According to Gaugler, the objective of his
invention was "to cause absorption of heat, or in
other words evaporation of the liquid to a point
above the place where the condensation or giving
off heat takes place without expending upon the
liquid any additional work to lift the liquid to an
elevation above the point at which condensation
takes place". A capillary structure was proposed
as the means for returning the liquid from the
condenser to the evaporator.

8.  The first consideration in the identification of the working
fluid is the operating vapor temperature range.
 Within the approximate temperature band, several possible
working fluids may exist and a variety of characteristics
must be examined in order to determine the most
acceptable of these fluids for the application considered.

9.  Compatibility with wick and wall materials
 Good thermal stability
 Wettability of wick and wall materials
 High latent heat
 High thermal conductivity
 Low liquid and vapor viscosities
 High surface tension

10.  Cylindrical Heat Pipes
 Vapor chamber or flat heat pipes
 Variable Conductance Heat Pipes (VCHPs)
 Diode Heat Pipes
 Loop heat pipe

11.  The working principle, the fluid flow and heat
transfer mechanism are similar in any heat pipe
(irrespective of the shape).
 Niobium, Zirconium and Tungsten were the
container materials used.
 The working substances used were Lithium, Lead,
Bismuth and Barium.
 The temperature range selected was between 1500°C
and 2000°C for the operation of their heat pipes

13.  Thin planar heat pipes (heat spreaders) have
the same primary components as tubular
heat pipes.
 Heat input to the evaporator vaporizes liquid,
which flows in two dimensions to the
condenser surfaces.
 After the vapor condenses on the condenser
surfaces, capillary forces in the wick return
the condensate to the evaporator.

16.  Where the intake or exhaust air ducts must be rerouted extensively,
the benefits are likely not to offset the higher fan energy and first
cost.
 Use of heat pipe sprays without careful water treatment. Corrosion,
scale and fouling of the heat pipe where a wetted condition can
occur needs to be addressed carefully.
 Laptop heat pipe solution.
 Heat pipes used in processor and CPU.
 Space craft

17.  Passive heat exchange with no moving parts.
 Relatively space efficient.
 The cooling or heating equipment size can be reduced in
some cases.
 The moisture removal capacity of existing cooling equipment
can be improved.
 No cross-contamination between air streams.

18.  Heat pipe is a thermal super conductor under certain heat
transfer condition they can transfer the heat energy 100 times
more than available best conductive materials, because of
negligible temp. Gradient exist in heat pipe.
 The heat pipe has compactness, light weight, reversible in
operation and high thermal flux handling capability makes
heat pipe to use new modern era and in many wide varient
application to overcome critical heat dissipation problem.

19.  www.google.com
 www.wikipedia.com
 www.studymafia.org
 www.heatpipe.com
 www.indek.com