[esp-r] Re: air quality assessment for room with natural ventilation

[Aizaz Samuel]

Contaminant modelling works with bi-directional flow components just as with 
other components and you probably will end up with more CO2 going out of the 
zone as coming into it provided there are local CO2 sources (metabolic rates 
maybe) defined within the zone. I have never made a model with bi-directional 
components though and would fall back on Jon's recommendation if it does not 
work.

There is no provision yet to show the mass flow of contaminant along each flow 
path because only concentration for each node is stored in the results 
library. It should be possible to obtain this information by post processing 
node concentrations and air flow rates 

-Aizaz

On Wednesday 07 November 2007 07:06, Jon Hand wrote:
> A bi-directional component might be replace by
> two common orifice components (suitably placed to
> represent the upper and lower portion of the window).
> That should allow the CO2 to 'see' the flow in.
>
> Whether the CO2 bookkeepping could be revised to
> allow it to track both paths of a bi-directional component
> is something Aizaz might advise on.
>
> -Jon
>
>
> -----Original Message-----
> From: Pueltz, Gunter [mailto:Gunter.Pueltz at MuellerBBM.de]
> Sent: Wed 11/7/2007 6:38 AM
> To: 'esp-r at lists.strath.ac.uk'
> Cc: Aizaz Samuel; Jon Hand
> Subject: air quality assessment for room with natural ventilation
>
> Dear ESP-r developers,
>
> currently I have a simulation job for an office building, which shows
> only natural ventilation (NO mechanical ventilation) by openable windows.
> In Summer the rooms are cooled by chilled ceilings.
>
> Now my client wants infos about the indoor air quality, which can be
> obtained by the window ventilation.
> I do know, that ESP-r shows the ability to calculate CO2-concentrations.
> This is a good facility to assess indoor air quality, as CO2 is
> representing air quality very well.
> But my last knowledge of this contaminant calculations in ESP-r was,
> that for a flow component with BI-DIRECTIONAL air flow (typical for an open
> window)
> only the net-flow is taken into account for the CO2-balance in ESP-r.
> The net-flow of an open window of one single room always is zero - so this
> approach
> do not work for a room with single-sided window ventilation.
> Or - in other words - the reduction of CO2-concentration in a room by a
> bidirectional airflow through an open window can not be calculated so far.
>
> Currently I am using ESP-r, version 11.3: Does this (or a future ?) version
> show the ability to assess indoor air quality in rooms with natural
> ventilation
> (which means BI-DIRECTIONAL air flow must be taken into account completely)
> ?
>
> Best regards,
> Gunter
>
> --
> Dr. Gunter Pültz
>
> Müller-BBM GmbH
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