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Question: there are 3460 pounds of water in the jacket of...

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There are 3460 pounds of water in the jacket of a reactor that are initially at 145°F. At time equals zero, 70°F cooling water is added to the jacket at a constant rate of 400 pounds per minute. The holdup of water in the jacket is constant since the jacket is completely filled with water and excess water is removed from the system on pressure control as cold water is added. Water in the jacket is perfectly mixed. How many minutes does it take the jacket to reach 90°F if no heat is transferred into the jacket?

The answer is 11.43 min.

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