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A well-sealed room contains 60 kg of air at 200 kPa and
Chapter 4, Problem 147P(choose chapter or problem)
Problem 147P
A well-sealed room contains 60 kg of air at 200 kPa and 25°C. Now solar energy enters the room at an average rate of 0.8 kJ/s while a 120-W fan is turned on to circulate the air in the room. If heat transfer through the walls is negligible, the air temperature in the room in 30 min will be
(a) 25.6°C
(b) 49.8°C
(c) 53.4°C
(d) 52.5°C
(e) 63.4°C
Questions & Answers
QUESTION:
Problem 147P
A well-sealed room contains 60 kg of air at 200 kPa and 25°C. Now solar energy enters the room at an average rate of 0.8 kJ/s while a 120-W fan is turned on to circulate the air in the room. If heat transfer through the walls is negligible, the air temperature in the room in 30 min will be
(a) 25.6°C
(b) 49.8°C
(c) 53.4°C
(d) 52.5°C
(e) 63.4°C
ANSWER:
Step by step solution Step 1 of 2Given,Mass of air in the room,Initial pressure of airInitial temperature of airThe power of the fanThe solar energy transferred to the room isTime duration,From properties of ideal gas tableThe gas constant of air,Specific heat of air,