[Equest-users] Multiple DOAS in Series

[Carol Gardner]

Hi Kathryn,

Just a couple of quick thoughts. Do you need to physically specify 2 DOAS
units? Could you just specify one with an ERV and with the entering
conditions of the first unit and the leaving conditions of the second unit?
I'm not thinking of any downside to doing it that way but I'm not deep in it
like you are. Let me know what you think.

Cheers,

Carol

On Mon, Oct 18, 2010 at 2:06 PM, Kathryn Kerns <
kathryn.kerns at bceengineers.com> wrote:

>  Has anyone ever tried to model 2 DOAS units in series? I have
> successfully modeled a single DOAS/multiple fan coil system, but I have
> never tried to string two DOAS units together by feeding the supply air
> output of the first DOAS into the outside air input of the second DOAS. The
> reason I ask is that I am looking for a way to model a DOAS that has an ERV
> device located downstream after a heating and a cooling coil.  Does anyone
> know whether DOE-2 would treat the system exhaust air coming back through
> the second DOAS ERV any differently than the exhaust air going back through
> a single DOAS with an ERV unit?
>
>
>
> Assuming that this works, does anybody know how to add heat to, or manually
> raise the temperature of, the ERV exhaust air?
>
>
>
> I am thinking if I can model a multiple DOAS with an elevated exhaust
> temperature, I might be able to mimic a desiccant system. According to James
> Hirsch in California, the energy balance used in the desiccant tabs is not
> correct and should not be used, so I am out of luck there.
>
>
>
> If anyone has another method for modeling a desiccant system, I would love
> to hear from you.
>
>
>
> *Kathryn Kerns*
>
> *Systems Specialist*
>
> *BCE** Engineers, Inc.*
>
> *| Ph: 253.922.0446 | Fx: 253.922.0896 |*
>
>
>
>
>
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-- 
Carol Gardner PE
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