Answered: A well-insulated 3-m * 4-m * 6-m room…

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter21: Heat And The First Law Of Thermodynamics

Section: Chapter Questions

Problem 44PQ

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A well-insulated 3-m * 4-m * 6-m room initially at
7°C is heated by the radiator of a steam-heating system. The
radiator has a volume of 15 L and is filled with superheated
vapor at 200 kPa and 200°C. At this moment both the inlet
and the exit valves to the radiator are closed. A 120-W fan
is used to distribute the air in the room. The pressure of the
steam is observed to drop to 100 kPa after 45 min as a result
of heat transfer to the room. Assuming constant specific heats
for air at room temperature, determine the average temperature
of air in 45 min. Assume the air pressure in the room
remains constant at 100 kPa.

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