can i ask u some question? about the heat transfer..1st question ,On a hot summer day, a student turns his fan on when he leaves his room in the morning. When he returns in the evening, will the room be warmer or cooler than the neighboring rooms? Why? Assume all the doors and windows are kept closed
colder
Warmer, applied Newton's 1st law
Of course, you can ask me any question you have about heat transfer!
In this scenario, when the student turns on the fan in the morning and leaves the room with all doors and windows closed, the room will likely be cooler than the neighboring rooms when he returns in the evening.
The reason for this is that the fan increases the airflow within the room. When air moves across the skin, it can accelerate the process of perspiration and evaporation, which helps to cool the body. This is known as the wind-chill effect.
As the fan circulates air in the room, it increases the rate at which heat is transferred from the student's body to the surrounding air. This process, known as convective heat transfer, allows the student's body to cool down more efficiently throughout the day.
On the other hand, the neighboring rooms, which do not have the fan running, will experience less air movement and a slower rate of convective heat transfer. As a result, the neighboring rooms are likely to be slightly warmer compared to the room with the fan.
It's important to note that the effectiveness of the fan in cooling down the room depends on factors such as the room size, fan power, and outdoor temperature. Other factors such as insulation, thermal properties of walls, and sources of heat within the room can also influence the overall temperature difference between the rooms.