100 kg/h into a tank heated by a 7.5 kW heater and containing 1000 kg of water at 20C. Water enters with mass velocity and heated water is taken out of the tank at the same velocity. From the surfaces of the tank to the environment coefficient for heat escaping h=10 (kcal/m2 hourC). The total surface area of the tank is 8 m2 is . The ambient temperature is 20C. a) After how many hours will the temperature of the water in the tank reach 40C? b) How many C does the temperature of the water in the tank reach? c) If the heating process is terminated while the temperature of the water in the tank is at the highest temperature, after 2 hours the water How many C does the temperature drop?

100 kg/h into a tank heated by a 7.5 kW heater and containing 1000 kg of water at 20C. Water enters with mass velocity and heated water is taken out of the tank at the same velocity. From the surfaces of the tank to the environment coefficient for heat escaping h=10 (kcal/m2 hourC). The total surface area of the tank is 8 m2 is . The ambient temperature is 20C. a) After how many hours will the temperature of the water in the tank reach 40C? b) How many C does the temperature of the water in the tank reach? c) If the heating process is terminated while the temperature of the water in the tank is at the highest temperature, after 2 hours the water How many C does the temperature drop?

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter2: Matter And Energy

Section: Chapter Questions

Problem 27RQ: How many Btu/h would be produced in a 12-kW electricheater?

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