[Gasification] heat exchanger / boiler design book recommendations?

[Benjamin Domingo Bof]

Andrew, in spanish "rugosidad o arrugas" is wrinkles.This could be surface finishing.Anothers questins are configurations vertical or horizontal heat exchangers, convection and radiation. Every phenomenae have his proper formulas.Sorry for  my english, I start to study english in 1957-59 at high school . In University with tech books and in 1977 we stay in UK visiting also Scotland . I remeber very good your country. Where you are?
  Benjamin

andrew <list at sylva.icuklive.co.uk> escribió:
  On Monday 24 December 2007 11:42, Benjamin Domingo Bof wrote:
> Andrew an road map; 

Hi Benjamin, I think I agree all your points but I'll paraphrase them 
to see if we understand each other, I cannot extend you the courtesy 
of replying in your lanquage as I only speak english, so you have 
the better of me.


> first question in heat transmission is 
> surface,

Do you mean surface area? Basically the more the better, that's why 
firetubes often have corrugations and of course we see fins added in 
car radiators to increase the surface exposed to the gas flow.

> second temperature jump, 

The temperature difference between the hot flue gases , the primary 
current, and the fluid being warmed in the secondary circuit, often 
referred to as delta T.

> third thermal coefficient 
> transmission of material, 

This is the ability of the material the heat exchanger is made from, 
often metal, to transmit the thermal power from one side to the 
other. In practise this is less limiting than the boundary layers 
which can be treated and thermal resistances in series with the 
metal.

> and fourth is rugosity involved in heat 
> conduction.

Yes the surface texture affects the boundary layer, the static layer 
of gas that stops the hot gases touching the surface of the heat 
exchanger. BTW I had to look up "rugosity".

AJH


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