Technically, yes, opening the door of a refrigerator in a closed room can cool down the room to some extent, but it's not an efficient or practical method of cooling. Here's why:
Cooling Effect: When you open the refrigerator door, the cold air inside the fridge will escape and mix with the warmer air in the room. This can cause a localized cooling effect in the immediate vicinity of the fridge, but it won't cool the entire room evenly or effectively.
Energy Inefficiency: Refrigerators are designed to maintain a cool temperature inside while expelling heat from the back coils. When the door is opened, the fridge has to work harder to restore the temperature, consuming more energy in the process. The net effect of leaving the door open for an extended period would be to heat up the room rather than cool it down.
Limited Cooling Capacity: The cooling capacity of a typical household refrigerator is not sufficient to cool down an entire room. It's designed to cool a confined space within the fridge, and the amount of cold air it can release into the room is limited.
Temperature Imbalance: Even if you manage to cool down the immediate area around the refrigerator, the rest of the room will likely remain warm, leading to an uncomfortable temperature imbalance.
Overall, using a refrigerator to cool a room is not an effective or energy-efficient method. If you want to cool down a room, it's better to use a proper air conditioning system, a fan, or open windows to create cross-ventilation. Alternatively, you can use a standalone fan or a portable air conditioner to target specific areas and create a more consistent cooling effect.