A cooling tower is a device that cools a spray of water by passing it through a stream of air. If 15 m3/s of air at 30°C dry-bulb and 20°C wet-bulb temperature and an atmospheric pressure of 90 kPaa enters the tower and the air leaves saturated at 28°C. This air stream cool a spray of water entering at 35°C with a flow rate of 20 kg/s. What is the partial vapor pressure of entering air in kPaa?

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