8. Problem 2-33 (modified), Davis and Cornwell, Introduction to Environmental Engineering, 6th Ed.: The discharge pipe from a sump pump in the dry well of a sewage lift station did not drain properly, and the water at the discharge end of the pipe froze. A hole has been drilled into the ice, and a 250-W electric heater has been inserted in the hole to melt the ice. Assume all the heat goes into melting the ice. a. Is the system an open system or a closed system? b. Construct an energy balance for the system. C. If the discharge pipe contains 3.75 kg of ice, how long will it take to melt the ice?
8. Problem 2-33 (modified), Davis and Cornwell, Introduction to Environmental Engineering, 6th Ed.: The discharge pipe from a sump pump in the dry well of a sewage lift station did not drain properly, and the water at the discharge end of the pipe froze. A hole has been drilled into the ice, and a 250-W electric heater has been inserted in the hole to melt the ice. Assume all the heat goes into melting the ice. a. Is the system an open system or a closed system? b. Construct an energy balance for the system. C. If the discharge pipe contains 3.75 kg of ice, how long will it take to melt the ice?
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:8. Problem 2-33 (modified), Davis and Cornwell, Introduction to Environmental Engineering,
6th Ed.:
The discharge pipe from a sump pump in the dry well of a sewage lift station did not drain
properly, and the water at the discharge end of the pipe froze. A hole has been drilled into the
ice, and a 250-W electric heater has been inserted in the hole to melt the ice. Assume all the
heat goes into melting the ice.
a. Is the system an open system or a closed system?
b. Construct an energy balance for the system.
C.
If the discharge pipe contains 3.75 kg of ice, how long will it take to melt the ice?
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