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Hi, thank you for sharing your great project. I am a math, science, and technology teacher at a small school http://www.panajachelcolegio.org/ on Lake Atitlan in Guatemala. We have a lot of problems with garbage in the lake. My students and I are thinking of building an autonomous boat to travel around the shore of the lake cleaning up garbage. I am thinking of using your instructable to build a miniature prototype. Perhaps you would like to collaborate with us.
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That would violate the law of conservation of energy. In fact, the net effect, including the fan, would be to add heat to the room. If the back half was outside of the room, with only the exit hole inside the room, it would output air that was cooler than the input air, assuming that the fan motor doesn't add too much heat.
Hi EmmitS. I meant to reply to to the person who suggested that it would work without the ice just due to the rapid expansion of the air as it leaves the milk carton. Actually, while I agree with everyone who states correctly that, as long as there is no heat leaving the system, the electricity entering the fan and the freezer that made the ice can only serve to warm up the room, even the proposed iceless system should create a refreshing cooling sensation for the person on whom the slightly cooled air is blowing
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