Humidity Control in a Containerized Station

When the compressor of a packaged air-conditioner for cooling a containerized station stops operating, the relative humidity of the room exceeds the upper limit of the specified range. The high relative humidity phenomenon is caused by water forming on the cooling coil of the air-conditioner. This water condenses, while the compressor is running, and is vaporized by the fan airflow which continuously operates, even after the compressor stops operating. As a result of this the water is not expelled to the outside but remains in the room, and the relative humidity increases. Several experiments are conducted to find a way of reducing the relative humidity in containerized stations. One way involves reducing the draft air volume, which contains a high level of moisture. Experiments and field tests indicated that the most effective method for maintaining the specified temperature range and relative humidity in a room, is to control the compressor by the room air temperature and the room fan by the relative humidity when the compressor stops operating.