A student living in a 4m x 6m x 6m dormitory room turns on her 150 W fan before she leaves the room on a summer day, hoping that the room will be cooler when she comes back in the evening. Assuming all the doors and windows are tightly closed and disregarding any heat transfer through the walls and the windows, determine the temperature in the room when she comes back 10 h later. Take R = 0.287 kJ/kg.K, and Cy = 0.718 kJ/kg.K, and assume the room to be at 100 kPa and 15C1

A student living in a 4m x 6m x 6m dormitory room turns on her 150 W fan before she leaves the room on a summer day, hoping that the room will be cooler when she comes back in the evening. Assuming all the doors and windows are tightly closed and disregarding any heat transfer through the walls and the windows, determine the temperature in the room when she comes back 10 h later. Take R = 0.287 kJ/kg.K, and Cy = 0.718 kJ/kg.K, and assume the room to be at 100 kPa and 15C1

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

A student living in a 4m x 6m x 6m dormitory room turns on her 150 W fan before
she leaves the room on a summer day, hoping that the room will be cooler when
she comes back in the evening. Assuming all the doors and windows are tightly
closed and disregarding any heat transfer through the walls and the windows,
determine the temperature in the room when she comes back 10 h later. Take R=
0.287 kJ/kg.K, and Cy 0.718 kl/kg.K, and assume the room to be at 100 kPa and
15 C in the morning when she leaves.

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