Dehumidification and temperature difference issues in packaged air handling units

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The air volume of the main unit is 21,000, and the area of the clean zone is 250 square meters. The combined unit does not have a separate dehumidification section; therefore, low-temperature dehumidification at 7°C is used. The desired humidity level is 45–65%, while the temperature should be between 18–26°C. Low-temperature dehumidification is not very effective in this case, as it ends up making people feel extremely cold; the humidity level stops dropping once it reaches 71%. The outlet temperature of the screw chiller is 8.1 degrees, and the return water temperature is 10.6 degrees. The temperature of the combined chassis is 11 degrees, the return air temperature is 17 degrees, and the average room temperature in the clean area is 17 degrees. The energy efficiency of the chilled water has reached its limit; the humidity cannot be reduced, nor can the room temperature be lowered. Where exactly is the problem? Can 7-degree water remove moisture?