Question

Why are air conditioners fixed at the top but not at the lower places??
answer:

Answer 1

They are put on the top so that the air could flow in all parts of the room to make it cool.

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Answer 2

Answer:

That’s because cold air sinks and warm air rises. In a conventional unit or split type air conditioner, air is blown out horizontally from the supply air outlet and warm air needs to be returned back to the air conditioner itself. These type of units work by mixing the cold supply air with the room air at high level to attain the desired temperature before the air reaches our body level. If such units are placed on the floor, the cold supply air will accumulate near the floor, causing overcooling of the feet. At the same time, the warmer air at the higher body level will have difficulty returning back to the air conditioner at lower level, causing insufficient cooling at the body level.

However, there is a type of air distribution system called Underfloor Air Distribution (UFAD) where cold supply air from the central air conditioning unit is distributed to the room from the under raised floor. The idea is to let air out vertically at low velocity from floor grilles. This low velocity air will gain heat as it travels upwards and increase it own buoyancy, picking up contaminants and cooling our body along the way. The return air grilles are located at high level. So this design allows air a natural pathway of air supply and return dictated by its buoyancy. The advantages include low air draft, a more uniform cooling distribution, improved air quality and improved energy efficiency compare with supplying and returning air both at high level.

Explanation: