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1. You are assigned to design a heating system for a swimming pool that is 2 m deep, 20 m long and 20 m wide. The client desires that the heating system be large enough to raise the water temperature from 2 C to 3C in 2 hours. The rate of heat loss from water to air at the outdoor design conditions is determined to be 900 , and the heater must be able to maintain the pool at 3C at those conditions. Heat losses to the ground cn be disregarded. It is requested to have an electric heater with its efficiency of 90 percent. Please recommend the heater size in term of kW and prepare answers for possible questions that your client could raise to you.
2. If above question is not a swimming pool, but a tea maker with top open atmosphere. It contains 10 L of water when full. Once boiling starts, it is observed that half of the water in the tea maker evaporates in 20 min. Determine the power rating of the electric heater immersed in water and presents the thermodynamic process of water in pressure-specific (P-v) volume diagram.
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