nh3simman
12-10-2008, 05:29 AM
Hi Folks
It's been a while since I have been around here. I see plenty interesting topics to read but now I have a problem and need some help.
I have been searching for design info on natural convection cooling coils (gravity coils) and come up blank on all counts.
I have searched heat transfer text books, ASHRAE Handbooks, manufacturers data sheets, web...
The only text book cases I find are
vertical or horizontal plates
vertical or horizontal cylinder
sphere
But, what are people using to calculate the duty of a fin and tube coil with natural circulation?
The closest I have found is a detailed review of natural recirculation systems by Harwell and the best match here is a tube bank.
Could it really be that there have been no studies on these coils.
I am expecting a correlation for the Nusselt number. This could be of the form
Nu = C (Gr Pr)^n
where C and n are determined by measurement.
Any info or feedback would be valued.
It's been a while since I have been around here. I see plenty interesting topics to read but now I have a problem and need some help.
I have been searching for design info on natural convection cooling coils (gravity coils) and come up blank on all counts.
I have searched heat transfer text books, ASHRAE Handbooks, manufacturers data sheets, web...
The only text book cases I find are
vertical or horizontal plates
vertical or horizontal cylinder
sphere
But, what are people using to calculate the duty of a fin and tube coil with natural circulation?
The closest I have found is a detailed review of natural recirculation systems by Harwell and the best match here is a tube bank.
Could it really be that there have been no studies on these coils.
I am expecting a correlation for the Nusselt number. This could be of the form
Nu = C (Gr Pr)^n
where C and n are determined by measurement.
Any info or feedback would be valued.