Constant temperature and humidity air conditioner is a kind of industrial air conditioner. In the field of strictly controlling indoor temperature and humidity fluctuation and regional deviation, using constant temperature and humidity air conditioner can control indoor temperature and humidity well, which is helpful to industrial production. As a kind of precision air conditioning, constant temperature and humidity air conditioner is widely used in electronics, optical equipment, cosmetics, medical care, biopharmaceuticals, food manufacturing, various metrology, testing, laboratories and other industries.
2. What is the working principle of constant temperature and humidity air conditioning system?
The air conditioning system with constant temperature and humidity consists of a controller, a man-machine interface, a frequency converter, a temperature and humidity sensor, a water valve actuator, a gas valve actuator, a high-temperature circuit breaker, a wind pressure switch and the like, and works through three interrelated systems:
1, refrigerant circulation system
The liquid refrigerant in the evaporator absorbs the heat of the air (the air is cooled and dehumidified) and begins to evaporate. Finally, the refrigerant forms a certain temperature difference with the air, and the liquid refrigerant completely evaporates into a gas state, and then is sucked and compressed by the compressor (pressure and temperature rise). Gaseous refrigerant absorbs heat through condenser (air cooling/water cooling) and condenses into liquid. Throttled by expansion valve (or capillary tube), it becomes low-temperature and low-pressure refrigerant, which enters the evaporator to complete the refrigerant circulation process.
2. Air ring system
The fan is responsible for sucking air from the air return port. After passing through evaporator (refrigeration and dehumidification), humidifier and electric heater (heating), the air is sent to the space required by users through the air supply outlet, and the sent air is mixed with the air in the space and returned to the air return outlet.
3. Electric automatic control system
The electric automatic control system comprises a power supply part and an automatic control part;
(1) The power supply part supplies power for compressor, fan, electric heater and humidifier. Through the contactor.
(2) Automatic control is divided into temperature and humidity control and fault protection. Temperature and humidity control is to compare the temperature and humidity of the return air with the temperature and humidity set by the user through the temperature and humidity controller, and automatically operate the compressor (refrigeration, dehumidification), humidifier, electric heating (heating) and other components to realize automatic control of constant temperature and humidity. The fault protection control is realized through the combination of pressure protection, delay, relay and overload protection, and controls the compressor, fan, humidifier and other components for fault protection.
3. How to control the temperature and humidity of constant temperature and humidity air conditioner?
Constant temperature and humidity air conditioner can sense the indoor temperature and humidity, and control the temperature and humidity through heating, refrigeration, humidification and dehumidification. The specific method is as follows:
1, temperature control
(1) heating: when the indoor sensor detects that the indoor temperature is lower than the set temperature, the PLC controller sends instructions to the four-way reversing valve and the auxiliary heater to work, thus achieving the purpose of heating.
(2) Refrigeration: When the indoor sensor detects that the temperature is higher than the set temperature, the PLC controller sends an instruction to the outdoor unit, the working condenser of the outdoor unit dissipates heat, the evaporator of the indoor unit cools the room, and then the cold air is sent into the static room through the fan.
3. Moisture regulation
(1) Humidification: When the indoor humidity sensor detects that the indoor humidity is lower than the set temperature, the PLC controller sends an instruction to the humidifier to realize humidification.
(2) Dehumidification: When the indoor humidity sensor detects that the indoor humidity is higher than the set humidity, the PLC controller sends instructions to the compressor and the solenoid valve to work, thus realizing the constant temperature dehumidification state.