Roof-Spray cooling systems are being extensively used toreduce the air-conditioning usage in industrial and commercialbuildings. In buildings without air-conditioning, evaporativeroof spray cooling systems help to reduce the interiortemperatures. The spray cooling systems also have beenfound to increase roof life and decrease maintenance.The present work involved designing and installing aroof-spray cooling system- on a storage building in the ResearchAnnex of Texas A&M University. The roof spraycooling system and the associated hardware were donatedand set up on the roof by a commercial vendor. Tests weredone during the summer of 1986 to compare the sprayed andunsprayed conditions on the roof surface temperatures , heattransfer through the roof, and the interior temperatures. Theresults showed that there was an 60 percent reduction in theheat transfer through the roof and also a reduction in insidetemperatures.A numerical simulation was also developed to be able topredict the temperatures and the various heat transfer ratesbased on a simple energy conservation model. The model underpredictedthe temperatures and the heat transfer throughthe roof when the roof was dry. But the results were closerto the experimental values when the heat loss due to evaporationwas also included in the sprayed case.
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