| http://www.w3.org/ns/prov#value | - A method of operating a device as defined in any one of the preceding claims, including the steps of: directing an evaporative fluid through the evaporator coil so as to reduce the temperature of an outer surface of the coil to a temperature less than or equal to the freezing point of the first fluid, thereby causing said first fluid to freeze on the outer surface of the evaporator coil, allowing
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