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(2) compression dehumidification: compress and cool the moist air to separate its moisture. It is effective in the case of small air volume, but not suitable for large air volume.

(3) solid adsorption dehumidification: the water is adsorbed on the solid absorbent by capillary action. It can reduce the dew point, but when the adsorption area is large, the equipment will become larger.

(4) liquid absorption dehumidification: use lithium chloride solution spray to absorb moisture. The dew point can be reduced to about - 20 ℃, but the equipment is large and the absorption solution must be replaced.

(5) dry dehumidification: the thin plate impregnated with hygroscopic agent is processed into honeycomb runner for ventilation and dehumidification. The dehumidification structure is simple, and the dew point can reach below - 50 ℃ after special combination.

The dehumidification methods with water meter cooler include cooling dehumidification and dry dehumidification.