If you put an air conditioner in a sealed room and leave it running, several things would occur:
Cooling Effect: The air conditioner would start to cool the air inside the room. It would absorb heat from the room's air and transfer it to the refrigerant in the air conditioning system. As a result, the temperature inside the room would gradually decrease.
Humidity Control: Air conditioners also remove moisture from the air, reducing humidity. The evaporator coil within the air conditioner cools and condenses the water vapor in the room, leading to dehumidification. Consequently, the relative humidity inside the sealed room would decrease over time.
Air Recirculation: Since the room is sealed, there would be limited fresh air exchange with the outside. The air conditioner would continue to recirculate and cool the same air within the room. This recirculation could lead to a decrease in oxygen levels and an increase in carbon dioxide levels over time. Without fresh air, the oxygen concentration could potentially become insufficient for human occupancy.
Temperature Equilibrium: Eventually, the air conditioner would reach a point where it can no longer cool the room effectively. This occurs when the cooling capacity of the air conditioner is balanced by the heat gain from various sources within the room, such as appliances, human bodies, and sunlight passing through windows. The temperature would stabilize at this equilibrium point.
Limited Air Quality: With limited fresh air exchange, the sealed room could experience a decline in air quality. Stale air, along with any pollutants or contaminants present, would continue to circulate without being effectively removed.
It's important to note that running an air conditioner in a sealed room for an extended period is not recommended due to potential health hazards associated with decreased oxygen levels and increased carbon dioxide levels. Proper ventilation and fresh air supply are essential for maintaining a healthy indoor environment.