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An air conditioning unit supplies 19 m³/min of air at 15°C and 1 bar to a room. Air returns from the room to the evaporator of the unit at 22°C. The air conditioner operates at a steady state. What is the main purpose of the air conditioning unit in this scenario?

a) Heating the room
b) Cooling the room
c) Dehumidifying the room
d) Ventilating the room

Answer :

Final answer:

The air conditioning unit's main purpose in this scenario is cooling the room by removing excess heat, as indicated by the cooler temperature of the supplied air compared to the room's returning air.So, the correct answer is option b.

Explanation:

The air conditioning unit's main purpose in this scenario is cooling the room by removing excess heat, as indicated by the cooler temperature of the supplied air compared to the room's returning air.

The main purpose of the air conditioning unit in this scenario is b) Cooling the room. The air conditioning unit operates to maintain a comfortable ambient temperature within the space by removing excess heat. Given the temperature of the air supplied by the unit is cooler (15°C) than the air returning from the room (22°C), the unit is working to lower the room's temperature to a more comfortable level.

Air conditioners function by transferring heat from the interior of a space to the outside, much like a refrigerator works to keep its contents cool. In this process, the refrigeration cycle employs the expansion and contraction of a refrigerant, resulting in the extraction of heat through evaporation and condensation. The objective of this cycle is not primarily to ventilate or dehumidify the room, although these can be secondary effects, especially in certain systems that include a dehumidifier. However, the primary function remains the removal of heat from the space to achieve a cooling effect.

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Rewritten by : Barada