Yeah, I was thinking something along the lines of a thermosphion.
The hardest design "area" is the suction port of the solar collector. Some how the pressure tank/solar collector must be at a pressure LESS than the suction pressure coming out of the evap. Or it must be FORCED into to solar collector with a pump.
I'm thinking maybe 2 tanks, One can be the solar collector itself, the other right before the solar collector with a compressor stuck in between the two. The sun hit the solar collector cause the thermosphion to start and the unit runs until the pressures are equal (a safe psi shut off) then the compressor is run forcing the gas into the solar collector again..... I'll make some drawing.
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שְׁמַע יִשְׂרָאֵל ה' אֱלֹהֵינוּ ה' אֶחָד
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