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

[Jon Hand]

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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