The problem with sealing my system is that I can't seem to figure out a good way to get the evaporator inside the reservoir and be sealed (which is what I meant by direct contact, the water/antifreeze is in direct contact with the evaporator from the dehumidifier).
In my setup I have the dehumidifier evaporator inside of a plastic ice chest (which is inside a bigger styrofoam ice chest with polyurethane spray foam inbetween), with the pump in there also. So I have the tubing for the pump coming out of the top of the reservoir and I also have the evaporator's capillary tube going into the reservoir and the return tube coming out, and also the power cable for the pump.
I've attempted sealing it the best I can by putting the ice chest's lid over the reservoir and stuffing some foam inbetween the lid and the reservoir (and then some 2 10lb weights on top to keep it compressed down). But I still wouldn't call it air tight, small gaps form around all the various tubes going in and coming out.
I'm not sure how you would make the reservoir air tight with a dehumidifier. You could make it air tight fairly easily if maybe you were constructing the whole thing from scratch (in other words you bought a compressor and some tubing and soldered/welded the stuff together and filled it full of freon yourself). Although any air tight situation seems to mean that your evaporator is permanently where ever your going to put it (which isn't very much fun for tinkering).
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