Re: Solar Gain Tests
Wrapping with black and insulation on three sides can definitely fool bees into cleansing flights when ambient it too cold.
In my first year, i added 2 inch of styrofoam on east, west and north side of hive as well as outer cover and under bottom board and then wrapped with black building paper. With that much insulation(minimal heat loss happening) and solar gain of south side, bees were being fooled into cleansing flights. Have added 1/2 styrofoam on front side in past two years and then black paper wrap and little false flights.
Going further, with a black wrap, I think one will get some solar gain but also there is considerable loss to the atmosphere on the sides out of the sun.
If you always do what you always did, you'll always get what you always got!