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anees
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Join Date: May 2007
Location: maharastra
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Fluids and Heat Pipes

06/17/2009 11:08 PM

please suggest me any fluid which can be used in heat pipe, working at 300degree temp.???????

it should have following properties

1.non poisonous

2.cheap

3.have high latent heat of vaporization(if possible)

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PWSlack
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#1

Re: heat pipe

06/18/2009 3:23 AM

Dow Chemical (usual disclaimer) peddles a range of silicone-based heat transfer fluids that might be applicable. A telephone call to their technical sales office, perhaps?

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nick name
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#2
In reply to #1

Re: heat pipe

06/18/2009 6:21 AM

Heat transfer fluids do generally not have the right properties for a heat pipe. As far as I know at least.
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anees
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#3
In reply to #2

Re: heat pipe

06/18/2009 11:36 PM

i think you r right .

i want to design heat exchanger which can carry high temp .

so what i suggested is to make capellary tube which carry fluid and rises due to temp

and circulate in closed loop.

now the problem is if i use water at 300 degree.

then water will evaporates and finally increse pressure in tube.

may cause failure .that why i need some fluid which suits my requirement.

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nick name
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#4
In reply to #3

Re: heat pipe

06/19/2009 8:30 AM

Give a better description of your problem, more details will help to give you a not superficial answer.
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ducon
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#5

Re: Fluids and Heat Pipes

06/19/2009 11:14 PM

Basically you are talking about Thermo Oil Circulation Systems with Thermo oil fluids.

There are over 100s of Thermo Oil Boiler manufacturers in india. Why don't you guys check your Yellow Pages. Call them up and they will tell you the oil/fluid make & specifictions. You can call up Shell India/ Caltex india and ask them.There are various names for them as Voluta C/ Therma B etc., as dictated by individual manufacturers.

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nick name
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#6
In reply to #5

Re: Fluids and Heat Pipes

06/20/2009 4:01 AM

I am sorry but according to your comment I have to ask following question: "Do you know what is a "heat pipe", and how it works?"
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anees
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#7
In reply to #6

Re: Fluids and Heat Pipes

06/20/2009 6:37 AM

hey buddy!!!

i know what the heat pipe is!!!!

but some one suggest me to use cappelary tubing,

instead of heat pipe......

so was my comment.

i gt my answer...

thanks a lot!!!!!!!

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nick name
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#9
In reply to #7

Re: Fluids and Heat Pipes

06/20/2009 6:15 PM

It is good to read what is written. My comment was not directed to you. Ducon understood it and gave the answer.

Capillarity depends on superficial tension which is in turn depending on temperature. So that before using capillarity you should check if it works.
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ducon
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#8
In reply to #6

Re: Fluids and Heat Pipes

06/20/2009 12:16 PM

Sorry nick name I interpretted the question wrongly. Yes, heat pipe:

How a Heat Pipe Works
A heat pipe is a closed evaporator-condenser system consisting of a sealed, hollow tube whose inside walls are lined with a capillary structure or wick. Thermodynamic working fluid, with substantial vapor pressure at the desired operating temperature, saturates the pores of the wick in a state of equilibrium between liquid and vapor. When heat is applied to the heat pipe, the liquid in the wick heats and evaporates. As the evaporating fluid fills the heat pipe hollow center, it diffuses throughout its length. Condensation of the vapor occurs wherever the temperature is even slightly below that of the evaporation area. As it condenses, the vapor gives up the heat it acquired during evaporation. This effective high thermal conductance helps maintain near constant temperatures along the entire length of the pipe.

Attaching a heat sink to a portion of the heat pipe makes condensation take place at this point of heat transfer and establishes a vapor flow pattern. Capillary action within the wick returns the condensate to the evaporator (heat source) and completes the operating cycle. This system, proven in aerospace applications, transmits thermal energy at rates hundred of times greater and with a far superior energy-to-weight ratio than can be gained from the most efficient solid conductor.



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tjako
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#10
In reply to #8

Re: Fluids and Heat Pipes

09/20/2009 12:28 PM

Whether and how can I build a home-made tube. I would like to conductive copper heat pipe was in adiabatic and condenser party the length of 2 feet and diameter 1/4".

I shall be grateful for yours help.
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anees (2); ducon (2); nick name (4); PWSlack (1); tjako (1)

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