(2) A well-insulated 114 m room initially at 4°C and 90 kPa is heated by the radiator of a steam heating system. The radiator has a volume of 40 L and is filled with superheated vapor at 400 kPa and 300°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 146 min as a result of heat transfer to the room. Assuming constant specific heats for air at room temperature and that the room is perfectly sealed, the temperature rise will be:

(2) A well-insulated 114 m room initially at 4°C and 90 kPa is heated by the radiator of a steam heating system. The radiator has a volume of 40 L and is filled with superheated vapor at 400 kPa and 300°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 146 min as a result of heat transfer to the room. Assuming constant specific heats for air at room temperature and that the room is perfectly sealed, the temperature rise will be:

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

(2) A well-insulated 114 m room initially at 4°C and 90 kPa is heated by the
radiator of a steam heating system. The radiator has a volume of 40 L and is
filled with superheated vapor at 400 kPa and 300°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 146 min as a result of heat transfer to the room. Assuming
constant specific heats for air at room temperature and that the Toom is
perfectly sealed, the temperature rise will be:
Fan
Steam
radiator
(a) 11.0 K
(b) 12.4 K
(c) 13.6 K
(d) 14.9 K
(e) 15.8 K

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