Several humidification methods commonly used in programmable constant temperature and humidity test chambers are as follows:

1. Water spray humidification method: ultrasonic type, centrifugal spray type and water pump spray type;

Ultrasonic humidification principle: Ultrasonic vibrator is installed at the bottom of the humidifier to emit ultrasonic waves into the water, so that the water is directly atomized at normal temperature, and the mist is sent into the tank by the airflow generated by the fan in the constant temperature and humidity test chamber for humidification.

Centrifugal spray humidification principle: The high-speed rotary fan is used to suck water out of the water tank, and the water droplets are extracted into fine water particles by centrifugal force, sent to a constant temperature and humidity test chamber, exchange heat with air, absorb heat and evaporate. Humidification.

Pump spray-type humidification principle: The water pump presses the water from the nozzle to the airflow, and the water particles exchange heat with the airflow, absorb the heat in the air and vaporize into steam to humidify.

2. Steam humidification method: sub-electric heat pipe or electrode humidification and high-pressure steam spray humidification;

The principle of electric heating tube or electrode humidification: by electrically heating water, steam is generated in the water tank, and the steam enters the constant temperature and humidity test chamber through the spray tube to humidify the air in the tank.

High-pressure steam spray humidification principle: The steam above atmospheric pressure from the steam boiler is decompressed and sprayed into a constant temperature and humidity test chamber for humidification.

3, surface evaporation heating method: humidification with shallow water tray;

Shallow water tray humidification principle: The airflow in the constant temperature and humidity test chamber passes through the surface of the shallow water tray in the tank, and the temperature is equal to the saturated air boundary region of the water surface temperature to perform the damp heat conversion. When the concentration of steam molecules in the boundary zone is greater than the concentration of water vapor molecules in the flowing gas stream, it is humidified, and vice versa.

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