[Bldg-sim] eQuest - Modelling Earth Air Tunnel system

[Karen Walkerman]

You could use OA from system, give the supply air a temperature schedule,
and put the equipment that conditions this air on a separate meter (as there
will be only fan energy required, not heating and cooling).

This, of course, assumes that you know what temperature the air will be
coming in at, but leaves everything else the same.

--
Karen

On Wed, Feb 18, 2009 at 12:33 PM, Demba Ndiaye <Demba.Ndiaye at uoit.ca> wrote:

>  A cautionary note here is that changing outside temperature in the
> weather file would, among others, change the load seen by the building.
>
> _____________
>
> Demba Ndiaye
>
>
>
> *From:* bldg-sim-bounces at lists.onebuilding.org [mailto:
> bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *Steve Mignogna
> *Sent:* Wednesday, February 18, 2009 11:23 AM
> *To:* vishnu at kalpakrit.com
> *Cc:* bldg-sim at lists.onebuilding.org
> *Subject:* Re: [Bldg-sim] eQuest - Modelling Earth Air Tunnel system
>
>
>
> Vishnuraj-
>
> This is very difficult and may not lead to the correct results, but one
> method would be to manually edit the weather file.  You would need to change
> the temperatures so that the outdoor air that is pulled into the system
> would be at the temperature of the earthduct preconditioned air.  However, I
> would not recommend doing this without testing to see how it changes the
> other aspects of the simulation.
>
> I have seen earthducts modeled correctly in both MATLAB and TRNSYS but I
> have not successfully modeled it within eQuest.
>
> --
> Steve Mignogna
> Atelier Ten
>
>
>  On Wed, Feb 18, 2009 at 2:48 AM, Vishnuraj Nair <vishnu at kalpakrit.com>
> wrote:
>
>
>
> Hi friends,
>
>
>
> I am trying to model an Earth Air Tunnel (EAT) system that is being used in
> a school for passive precooling.
>
> During summer first the air is pre cooled using the EAT and then
> evaporative cooling is done before being circulated into the zone.
>
> During monsoon again precooling is done using EAT and then chillers are
> being used for further cooling and dehumidification.
>
> Does anyone have any idea as to how to calculate and incorporate the degree
> of precooling that is achieved by the EAT into the eQuest model.
>
> Any help would be greatly appreciated. Thanks
>
> Vishnuraj Nair
>
> Kalpakrit Sustainable Environments Pvt. Ltd.
>
> New Delhi
>
> Tel: +91.124.4309490-92 Ext: 312 , Fax: +91.124.4309493
>
> E-mail : vishnu at kalpakrit.com
>
>
>
>
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