Found this:
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Finally, one could use a little ingenuity. The Romans used to make ice in the deserts of North Africa or Palestine by taking advantage of the low humidity (and therefore the low temperatures at night). They would put what they wanted to freeze in a pit well-insulated with straw. The pit would be covered with highly-polished shields or other objects during the day, to reflect the heat of the sun; at night, the pit would be uncovered so that it could lose heat to the desert air.
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Here:
How did they make ice before electricity? - Yahoo! Answers
Not sure if it relates the the topic but I found it interesting.
