SAH Solar Air Heater

*Update 20190119*
 In fully overcast but bright conditions, the SAH raises the air temperature by 7 degrees.
On days fully overcast dark and rainy, the SAH raises the air temperature by only 2.5 degrees (my SAH is cracked and needs to be sealed from moisture).

*end 20190119 update*

*Update 20190118*  I am really happy with my SAH under cold full sun conditions in winter!
   Outside temperatures: 34 to 37F
   Full sun attained at 9:20 am
   after about 1 hr 40 minutes of full sun
   Inside temperatures: 72 to 75F
Cubic Footage of air in dwelling: 1,440 ft^3
    ->see full data and the end of this post
*end 20190118 update*


The above performance is without the help of the rocket stove
 The rocket stove was not run the night before nor during the entire day.

So on a cold sunny day, I don't have to do anything:  how is that for no reoccuring monthly costs and no moving parts to replace or maintain????


  Note that my SAH leaves much room for improvement:
     -a very thin fully cracked pane could be replaced with a thick or double pane;
     -the body could be sealed to moisture (might move air faster);
     -a thin copper sheet painted black behind double panes;
     -a thermal housing to keep the wind from blowing across the insulated back.

The SAH's black back area measures 34" x 78" (1.7 m^2).
The lower input pipe measures 2" in diameter.
The upper output pipe measures 3" in diameter.
While the heater works, it works slowly, unlike Stan Geiser's SAH which forcefully pushed it's air out....Going to experiment to see what causes his to forcefully blow air out.

It's connections look like this:

Outside Ambient Temp (F), Inside Input Air (F), Inside Output Air (F), Sky
49F,                                        58F,                                          117F,    Clear/Sun
45F,                                        48.9F,                                         60F,   no sun, rain

 Input temperature near the floor

Output temperature about 40" off the floor.



On the third day the SAH's plexiglass snapped in half completely across the 34" span. Clearly the plexiglass was experiencing too much internal stress from thermal expansion: the first two days, the plexiglass looked like a styrafoam cup exposed to too much heat.  Then I took off the protective wrap and snap!  my SAH don't SAH no more.

I responded with duct tape until funds for a better remedy materializes (clear duct tape???? what's the world coming too?).

Here is how the SAH alone changes inside temperatures:



Here are the data I collected on December 25th with the SAH and the rocket stove running:
Beginning and End State of the over all tiny house December 25th temperature changes of the input and output air of the SAH (with the solar oven also included):

Here are the data I collected on January 1st 2019 with the SAH and the rocket stove running: