Later, I realized that the fan becomes slower with the sponge on it. It doesn't throw out as much air as it should. So it was cooling, but a very small area and over a long period of time. I tried to tackle this problem by making the sponge thinner. It was still taking very long to cool. Sudipto suggested that instead of trying to attach things to the fan, I should make blades from water absorbing material. This way the shape of the blades will be maintained.
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