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re: solar heating panel evaluation
4 aug 2004
gary   wrote:

>my free convection air panel is 5.5 inches thick, and 46.5 inches wide 
>( 256 in^2 cross section).  the panel is 95 inches tall.

vertical's best for natural airflow. the more height the better.

>...there are no twists or turns, except that the air makes a 90 
>degree turn entering and a 90 degree turn exiting.

you might improve the entry and exit with gradual transitions from
the smaller vent to the larger cross-sectional area, and add an
internal "turning vane," something like this:

|           t 
|       t
|     t
|   t        
|  t         t|
| t         t |
|t           t|


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