[TRNSYS-users] Steam ejector

Valeria Badalamenti valeriab.23 at gmail.com
Fri Nov 22 05:27:46 PST 2019


Thanks for your help.

I need to model an duble stade ejector that uses steam as a motor fluid and
sucks air  without moving parts.

The ejector works continuously and no, it is not necessary to simulate the
vacuum chamber.

My aim is to understand what happens if the flow rate of the incoming steam
varies and the conditions of the outgoing steam.

Process data are:

   - Inlet Air flow rate: 300 m3/h
   - Aspiration pressure : 80 mbar
   -  Inlet Steam pressure: 11 bar assoluti
   -  Inlet Steam flow rate at 1° stade: 330 kg/h
   - Portata al secondo o stadio:  Inlet Steam flow rate at 2° stade:  1.500
   - Cooling water (only condensate recovery function): 70 m3/h
   - tube fouling factor: 0.0003 (m2×h×°C)/kcal

I have no other information, I contacted the supplier but I am waiting.



Il mar 22 ott 2019, 19:43 David BRADLEY <d.bradley at tess-inc.com> ha scritto:

> Valeria,
>   I have not come across a steam ejector model but the device does not
> seem to be all that complex. I suspect that a model could be written. Could
> you give me a bit more information about what you are trying to model? For
> instance, do you also need to model the vacuum chamber? Do you just care
> about the conditions of the steam that would come out of the ejector? Is
> the vacuum pumped continuously by the ejector or is the ejector only used
> periodically?
> kind regards,
>  David
> On 10/21/2019 06:18, Valeria Badalamenti via TRNSYS-users wrote:
> Hi,
> i need to model a steam ejector to suction air and make vacuum.
> Is there a type? which types can i use to simulate this object?
> thanks,
> Valeria
> _______________________________________________
> TRNSYS-users mailing listTRNSYS-users at lists.onebuilding.orghttp://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org
> --
> ***************************
> Principal
> Thermal Energy Systems Specialists, LLC
> 3 North Pinckney Street - suite 202
> Madison, WI  53703 USA
> P:+1.608.274.2577
> F:+1.608.278.1475d.bradley at tess-inc.com
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