Re: [EnergyPlus_Support] Re: Need help for Naturally Ventilated Model [1 Attachment]

Subject: Re: [EnergyPlus_Support] Re: Need help for Naturally Ventilated Model [1 Attachment]

From: "bhavana patil ana5patil@xxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>

Date: Thu, 8 Dec 2016 16:05:14 +0000 (UTC)

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Hi,

I have calculated air change according to ASHRAE. I am attaching calculations here. Please let me know your views.

Thanks

From: "allinson_louis@xxxxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Thursday, December 8, 2016 3:56 PM
Subject: [EnergyPlus_Support] Re: Need help for Naturally Ventilated Model

No you cannot assume 3 ACH. Natural ventilation airflow is dependent on buoyancy driven (caused by internal/external temperature difference) and wind driven. These vary transiently and therefore you will not be delivering a constant ventilation rate, even if you are controlling the vent.

ideally you want to use the airflow network to model airlfow through the windows. You also want to then control the window openings such that you deliver the necessary airflow for IAQ (CIBSE guide B recommends 10l/s/person) when occupied and the sufficient airflow to mitigate overheating.

i suggest that you read section Group - airflow network in the inputoutput document

you could also use an interface like DesignBuilder and read their help files on modelling ventilation through a window

kind regards

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Posted by: bhavana patil <ana5patil@xxxxxxxx>

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Attachment not found: D:\Eudora\Attach\ACH Calculations.docx