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Most of the old refrigeration plants used ammonia for the refrigerant, and yes, as Andy suggested, lots of them had roof top chillers or chillers adjacent to the buildings. However, many plants also relied on non-recirculating water for refrigerant condensation as well. Generally, this type of refrigeration plant wouldn't be seen from the exterior of the building at all, as condensate water would be taken from the water supply, piped through an exchanger, and head right on down the drain (mentality in the earlier days was not quite so conservation minded as these days...). Wasteful nowadays, inexpensive those days, as the cost of a chiller and the subsequent maintenance required could be prohibitive compared to using the cheapest commodity available once and disposing of it through the drain. <br /> <br />Another common practice was to build the chiller indoors and vent through a louvered wall to the exterior...
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