[esp-r] Re: air flow with constant humidity

[Pueltz, Gunter]

Dear Monika,
 
your second approach with an additional zone should work well: 
I tried it once and succeeded in holding the supply air temperature as well
as the humidity
of supply air constant by using a zone-control function for this additional
zone upstream ....
This additional zone upstream might represent the AHU ....
 
For a constant air flow into your zone I recommend an air flow component of
constant mass flow component
(because the mass balance is solved and a constant volume component might
vary a little bit
due to varying density ...) between the ahu-zone and your room zone.
Do not forget an air opening towards outside for the air flow of ambient air
into your AHU ...
 
If you use only a constant air flow unit (without an AHU-zone) the humidity
of the incoming air is the same
as at the node the air comes from: In most cases the ambient air humidity
.... 
 
Gunter

-----Original Message-----
From: esp-r-bounces at lists.strath.ac.uk
[mailto:esp-r-bounces at lists.strath.ac.uk]On Behalf Of Hall Monika
Sent: Monday, February 19, 2007 3:57 PM
To: esp-r at lists.strath.ac.uk
Subject: [esp-r] air flow with constant humidity


Dear all,
 
I would like to control the humidity of an incoming air flow in a zone. My
first approach is to control the humidity with the flow network. I took the
air network component no 30 "constant volume flow rate component". But this
componet allowes only an input of a constant volume flow. Does anyone know
on which humidity the air flow is based?
 
The second approach will be with an additionally zone, which could be
humidity controlled and an air flow from this zone to the main zone.  I hope
that will work.
 
Had anyone done some work with an air flow with a constant humidity into a
zone? How is the best practice?
 
Thanks a lot for helping me.
 
Monika

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