[esp-r] Re: solar chimney

[Ehsan Baharvand]

Hi,

Thank you for your mail Jon. 

One question to see if I'm interpreting things in a correct manner: 
 When looking to volume flow rate and selecting a infiltration connection via 
Volume Flow Rate of AirFlow Result File the flow rate becomes sometimes 
negative! What does Negative result mean actually? Does it mean that the air is 
towards outdoors or from outdoors?

Jon's question: 
Well, I checked the results by choosing the timstep itegration turned OFF. The 
results stayed the same. I looked to the energy balance per thermal zone, 
and the results weren't so strange at all. Especially when looking to the ratio 
of chimney's main stream and what comes in as infiltration air rate. It is 1/10 
of the chimney's main stream with dT of 5 - 8 Kelvin depending on the height of 
the chimney!  

What attracted my attention was the infiltration rate direction per thermal 
zone! When looking more in detail - for a particular problem -  the ambient 
infiltration in the upper level of the chimney becomes negative. This means that 
the upper level air of the chimney goes simply to outside before it reaches the 
outlet of the system?! 

On the other side, the zones in the lower level have positive infiltration rates 
when looking to these connections. 


Thanking you in advance.

Kind Regards,
Ehsan 



________________________________
From: Jon Hand <jon at esru.strath.ac.uk>
To: Ehsan Baharvand <ebaharvand at yahoo.com>; Achim.geissler 
<achim.geissler at intergga.ch>; "esp-r at lists.strath.ac.uk" 
<esp-r at lists.strath.ac.uk>
Sent: Sun, April 3, 2011 10:57:56 PM
Subject: RE: [esp-r] Re: solar chimney


In an earlier email the simulation parameters were stated.  What caught my 
attention
was the 60 timesteps per hour with timestep integration turn ON.  This will 
write out
information once per hour.  I suggest that you save the information at each 
timestep
so that the actual flows and flux at each timestep is available for inspection.

-Jon Hand
________________________________________

. . .
b) how long is your pre-simulation period, how long is your simulation period 
and what does "temperature does not change" mean? "Not at all" or "not as much 
as expected"?
Pre-simulation = 12 days
Simulation period = 1 day (24h)
Time-step = 60
Integration per hour = yes
. . .
Kind regards,
Ehsan
________________________________
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