[esp-r] Mysterious zone temperatures

[Liam O'Brien]

Hi All,

I came across a strange phenomenon that I can't explain and I'm hoping 
someone out there can.  I have a very basic model with two adjacent 
cubic 1000 m^3 zones; one with a large glazing area, the other opaque.  
They are otherwise thermally identical.  I am studying the effect of 
different airflow rates between them. 

I specified airflow in the opr files by having air flow from zone #1 to 
zone #2 and the same quantity going the reverse direction, 
simulataneouly, for mass balance. 

What I would expect is: as the airflow rates approach some high level, 
the zone air temperatures equalize at some temperature that is near the 
average of the two when there is no airflow.

What I got: the temperatures do begin to equalize, but at some level 
that is about 2-3C below expected.  This reprsents a lot of "missing" 
energy.

I re-ran the model for airflow rates between 0 and 360 m^3/s.  The 
unexpected results appear to occur around 30 m^3/s and above.

The same experiment using an airflow network yielded a similar conclusion.

I would be extremely grateful if someone could enlighten me.  Thanks 
very much.

Liam O'Brien
PhD candidate
Concordia University