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

[Vishnuraj Nair]

Thank you all for the help.

One way that we are thinking of to model it is using the indirect and direct
evaporative cooling system both as a separate system.

Indirect system can then be made to the work of Earth Air Tunnel(EAT) of
sensibly precooling.

After this the direct evaporative cooler can further bring down the
temperature as well as humidify the air.

During the monsoon season the fan schedule for the direct cooling system can
be kept off and only indirect system will do the sensible precooling.

However one difficulty here is that we are not able to give the cooling
capacity for the indirect evaporative cooling system.eQuest accepts it only
for DX coils 

and cooling coils when chillers are being used.

 

We are trying to work along these lines and if anyone has any suggestion
please do share.

If we are able to come up with any solution, will certainly let you all
know.

Thanks again for your response.

 

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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From: Demba Ndiaye [mailto:Demba.Ndiaye at uoit.ca] 
Sent: Wednesday, February 18, 2009 11:04 PM
To: Steve Mignogna; vishnu at kalpakrit.com
Cc: bldg-sim at lists.onebuilding.org
Subject: RE: [Bldg-sim] eQuest - Modelling Earth Air Tunnel system

 

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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