Recently, there are many indoor open spaces with the water in a building for relaxing people. In that case, a lot of energy is needed to controll air conditioning for reducing vapor rates. So, the system which controls AC system in limited area for staying people is needed there. We are going to make the system by using the water surface in open spaces. We used some numerical simulation methods. This paper reports the property of air velocity on boundary area between water layer and air layer by using PIV method.
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