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How do steam grid humidifiers achieve humidification in air conditioning systems?

  1. By cooling the air supply

  2. By injecting steam into the supply air stream

  3. By using water spray

  4. By circulating cold air

The correct answer is: By injecting steam into the supply air stream

Steam grid humidifiers achieve humidification in air conditioning systems by injecting steam into the supply air stream. This method allows for the precise control of humidity levels in the air because steam, when introduced to an airstream, rapidly condenses and increases the moisture content of the air. The steam is typically generated by boiling water and is then fed into the air supply where it can mix effectively with the air. This direct injection method is efficient and helps to improve comfort levels in indoor environments by adding moisture without significantly altering the air temperature, as the steam does not cool the air. The remaining options do not effectively contribute to the process of adding humidity. For instance, cooling the air supply or circulating cold air would actually decrease humidity levels rather than increase them, while using a water spray may lead to uneven distribution and less control over humidity levels compared to the direct and efficient injection of steam.