[TRNSYS-users] Steam ejector

[David BRADLEY]

Valeria,

  Thanks for the additional information. I'm afraid I am not aware of 
such a component but I will certainly put it on our list of components 
that would be interesting to write. If you find (or already have) any 
papers that discuss the dynamics and performance of steam ejectors, I'd 
certainly be interested in reading them.

kind regards,

  David


On 11/22/2019 07:27, Valeria Badalamenti wrote:
>
>
> Hi,
>
> 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 kg/h
>   * 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.
>
>
> Thanks,
>
> Valeria
>
>
>
> Il mar 22 ott 2019, 19:43 David BRADLEY <d.bradley at tess-inc.com 
> <mailto: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
>>
>>
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>
>     -- 
>     ***************************
>     David BRADLEY
>     Principal
>     Thermal Energy Systems Specialists, LLC
>     3 North Pinckney Street - suite 202
>     Madison, WI  53703 USA
>
>     P:+1.608.274.2577
>     F:+1.608.278.1475
>     d.bradley at tess-inc.com  <mailto:d.bradley at tess-inc.com>
>
>     http://www.tess-inc.com
>     http://www.trnsys.com
>
-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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