Fast Facts  (page 22) HOW DO CHILLERS WORK?
			An aquarium chiller operates on the same principles as a refrigerator or air conditioner. Refrigerator gas, such as freon, is compressed, which results in a loss of termperature.

This compressed gas flows through the heat exchanger where it picks up heat from the aquarium water being pumped through the heat exchanger. The gas carries the heat back to the compressor, but on the way encounters the expansion valve, which allows pressure to drop suddenly. As the pressure drops, the gas gives up heat to a radiator, which dispels the heat into the surrounding air with the aid of a fan.

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