الفهرس 
Review of previous workOnly 14 pages are availabe for public view
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Abstract
A heat pipe is a device for transmitting considerable
thermal power with a relatively small temperature gradient. It
is a container that consists of three sections: evaporator,
condenser and adiabatic sections. The heat input to the
evaporator causes the working fluid to evaporate, and flow to
the condenser, where it rejects heat; condenses and returns to
the evaporator through the wick. The fluids and their pressures
are determined by the operating temperature of the device. The
operation of the heat pipe is restricted by certain limits; such as
wicking, entrainment, sonic, boiling and viscous limits.
In the present work a new design of the heat pipe has been
developed by the author.
A coaxial heat pipe design is adapted. The outside pipe works
as an evaporator (heat source) to cool the air and the inside
pipe works as a condenser (heat sink) which is cooled by water
(river, sea or lake).
This design has the advantage of having double evaporator,
and condenser areas compared with the conventional heat pipe.
Water is used as a working fluid in the temperature range from
30 to 45°C.
The use of this heat pipe air to water heat exchanger (HPHEX)
for enhanced cooling between the air and water can affect the
air conditioning pro,cess. This process depends on the
performance of the heat pipe heat exchanger,
The cooling load which is about 500 Watt is achieved when
the heat pipe heat exchanger (HPHEX) works in the range of
air temperature from 40 to 42°C and a range of air velocity from 3.56 to 4.065 m/s when the other parameters are constant.