re: solar heating panel evaluation
4 aug 2004
>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 |