[esp-r] Re: External convection coefficient

[Geissler Achim]

Dear Dimitrios

you can set both internal and external values via the "convection coefficients". A file (.htc) is generated with the general form of


HC_CTL for zone box2

*Date,Wed Jun 11 11:22:28 2008

   1 # number control intervals

   6 # number of surfaces

# (front Wall-2 Wall-4 Top-5 Base-6 back)

  0.00    24.00 # start and end time of interval

   1 # fixed coef. calculation control type

*Doc,User supplied hc values

90.000,-1.0000,-1.0000,-1.0000,-1.0000,-1.0000      values internal  (-1.0=default algorithm, i.e. Alamdari-Hammond)

90.000,-1.0000,-1.0000,-1.0000,-1.0000,-1.0000      values external

In above example (if I remember correctly), surface one of the zone gets fixed values inside and out of 90 W/(m2 K).

Best
Achim



Von: esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-bounces at lists.strath.ac.uk] Im Auftrag von Dimitrios Sfakianakis
Gesendet: Montag, 9. Januar 2012 20:28
An: 'esp-r at lists.strath.ac.uk'
Betreff: [esp-r] External convection coefficient

Dear all,

Wishing you all a happy new year!

I am trying to model a surface that is in contact with water. As far as I know, the main heat transfer mechanism in this case is convection (forced or natural depending on the state of the water) and the heat exchange between water and the surface depends on the area of the surface, the temperature difference and the convection coefficient (I know that the calculation of the coefficient is tricky and depends on many variables). My question is, is there an in-built facility that allows the user to change the convection coefficient for an external surface? From what I have seen so far, the user can alter the internal convection coefficient of a surface from "Zone composition -> Convection coefficients". I know that superimposing a new convection coefficient won't solve my problem, however I believe it is a good place to start.

Kind regards,

-

Dimitrios Sfakianakis

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.strath.ac.uk/archives/esp-r/attachments/20120110/27576e6a/attachment.html