Question

Explain why the hottest rooms in a house in the summer time are usually on the top floor. What thermal process is involved here? Is it better to have the air ducts near the ceiling or floor when you are trying to cool a room? Give one other example where this process comes into play and is important.

Answer 1

In summer, air is generally hot. Due to connection, hot air rises higher because its density gets lower when it is hot. This process is involves connection heating. Now, rooms at higher altitute will face this hot air, thats why, top floors are hotter than ground. Heavy cool air recides at lower level.

Ducts is better to be placed near the ceiling where hot air coming in contact with the cold surface will get cooler.

In shopping malls and industries , this procees of cooling finds its application in our daily life