Installation engineering fresh air unit and operation control
Installation engineering fresh air unit and operation control
The main function of the fresh air unit is to provide constant temperature and humidity air or fresh air for the air-conditioned area. The control of the fresh air unit includes the control of supply air temperature, relative humidity control of supply air, antifreeze control and various chain controls; The tuyere enters the fresh air unit...
Text label: installation engineering, fresh air unit and operation control
Installation project of fresh air unit and operation control
The main function of the fresh air unit is to provide constant temperature and humidity air or fresh air for the air-conditioned area. The control of the fresh air unit includes the control of supply air temperature, relative humidity control of supply air, antifreeze control and various chain controls; The tuyere enters the fresh air unit, and the fresh air unit will filter the incoming outdoor air to filter out the particulate dust in the air, then refrigerate and dehumidify or humidify the air, and then send cold air with suitable temperature and humidity after treatment through the blower to the air-conditioned area. If the fresh air unit is mainly to meet the requirements of clean and hygienic air in the air-conditioning area, not as the cooling load or heat load of the air-conditioning area, it is necessary to control the supply air temperature. In the supply air temperature control mode, the supply air temperature is always maintained. to remain constant.
Many air conditioning areas require the fresh air unit to be able to carry the indoor cooling load or heating load, which is manifested in the need to control the indoor temperature. Since the indoor cooling load or heating load is always changing dynamically, only the constant temperature of the supply air temperature is carried out. If the control cannot meet the requirements of indoor dynamic load changes, it is necessary to control the indoor temperature. The specific control method is to detect the real-time indoor temperature value through the sensor, and input the temperature signal to the controller. If the temperature is higher than the set temperature , the controller needs to be processed; the difference between the detected temperature and the set temperature value is used as the basic control parameter for controlling the flow of chilled water or hot water flowing through the coil. When the difference is large, the electric valve valve that controls the flow The opening degree is increased, otherwise the opening degree is reduced, and the flow of chilled water or hot water is increased, that is, the supply of cold or heat is increased, thereby realizing real-time control of the air-conditioning area. The design maximum air volume of the fresh air unit is set according to the number of users in the air-conditioned room when the number of users is full. In the actual use process, the number of users in the air-conditioned room is generally not full, so the fresh air volume should be reduced to save energy. This method is especially suitable for some office buildings and other areas that use fan coil units and fresh air systems. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean engineering and clean workshops.
The adjustment methods of the relative humidity of the fresh air unit include steam humidification; circulating water spray humidification; high pressure spray, ultrasonic humidification and electric humidification. In many application environments, the amount of steam humidification is automatically adjusted according to the requirements of the controlled humidity. The steam humidification adopts a regulating valve, the regulator should use a PI type controller, and the air duct humidity sensor is installed at the air supply port of the air supply unit to supply air. On the pipeline; in some application environments, position-type humidifiers and position-type regulators can also be used, and position-type control mode is used for humidification adjustment. When using the position control, the temperature sensor should be set in a position where the relative humidity changes relatively gently. The humidification methods of high pressure spray, ultrasonic humidification and electric humidification all adopt the position adjustment method. The humidity sensor should be set in a position where the relative humidity changes relatively smoothly. The controller adopts the position mode to control the start and stop of the humidifier.
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