[esp-r] solar chimney

[Ehsan Baharvand]

Dear all,

Problem
The free-floating of a solar chimney is simulated and a upward stream due to the 
solar energy occurs. 
However when increasing the infiltration (colder ambient air) by increasing the 
opening area to outside the backwall inside surface temperature doesn't 
change!  Other thing is that the heat load inside the chimney is being removed 
by the infiltration air exchange. Eventhough I increase the infiltration air 
exchange, the heat load being removed increases, but the surface temperature of 
the backwall remains the same. 


Question
Do I forget something? What can be the problem?
I'm certain about the configurations and the Air Flow Network. 

Model
The 22 zones solar chimney uses a air flow network and has 2 wind pressure 
boundary nodes at the inlet and the outlet. 

Each zone has a separate connection with the outdoors through a air flow network 
connection, which simulates a opening between glazing panels meant for 
infiltration!
The inlet and the outlet areas are connected to the ambient air thourgh a 
orifice with a Cd of 0.67. 

Between the cubic thermal zones fictitious surfaces are used. 
The backwall is a massive construction with adiabatic BC at the surface outside 
node. 

At 1.8 meter distance from the backwall there is a glazing surface with a 
G-value of 0.8 and 80% of glass and it has a external BC. 

The chimney is South oriented for a Climate catagory 3A according to Ashrae 
90.l. 


Not included
Wind effect is not included.


Kind regards,

E. Baharvand 
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