[esp-r] Re: Simulating solar sewage drying

[esp-r at h-rd.org]

Dear Oliver,

I would be reluctant to try to model drying of sludge accurately in a model like
esp-r.  I would guess that you can model part of the drying approximately, but
that you need more specialized models for accurate prediction.
As long as the sludge acts as a fluid, the drying is basically limited by the
incoming energy, but when the sludge becomes dryer, it behaves as a porous
medium, containing solid and fluid.  This phase is much harder to model and you
need a specialized drying model.

yours sincerely,

Marc Hoffmann
esp-r at h-rd.org


Citeren Oliver Bucks <oliver.bucks at club-internet.fr>:

>
>
>  Dear all,
>
>  I have ben asked to simulate a greenhouse in which treated sewage slugde
> will
> be
>  dried by incoming solar radiation and ventilation at ambient temperature.
>
>  I have no idea if ESP-R has the capacity to integrate the drying of material
>  (with regards to the effects to temperatures, hydrometrics)
>
>  The building part of the simulation shouldn't pose a problem, it is the
> input
> of
>  the sewage sludge's physiometrics and the possiblity of calculating the
> scicity
>  (percentage dryness) in time of the sludge which is giving me worries.
>
>  I noticed that there is no possibility to introduce the humidity of a
> material
>  in the materials' database, but have also noticed a control which makes
>  reference to 'wet opaque surface' and 'swimming pool'......
>
>  Are there any ESP-R users who have simulated the drying of substances in
> ESP-R
>  models, and have they encountered any problems (if so, how did they get
> round
>  them !!)  ?
>
>  Many thanks in advance,
>
>  Olli Bucks
>
>  Paris