Clean Engineering Air Conditioning Unit and Operation Control

Clean Engineering Air Conditioning Unit and Operation Control

Central air conditioner is composed of cold and heat source, air conditioner terminal equipment, air duct system and automatic control system. From the perspective of specific component functions, central air conditioner consists of fresh air part, air filter part, air heat and humidity treatment part, air The conveying distribution and control part and the air conditioning system...

Text Label: Clean Engineering Air Conditioning Unit, Operation Control

Clean Engineering Air Conditioning Unit and Operation Control

Central air conditioner is composed of cold and heat source, air conditioner terminal equipment, air duct system and automatic control system. From the perspective of specific component functions, central air conditioner consists of fresh air part, air filter part, air heat and humidity treatment part, air The transmission, distribution and control part of the air conditioning system and the cold and heat source of the air conditioning system are composed of several parts; the fresh air enters the air treatment device and must pass through the filter to remove the larger dust particles in the air. The general air conditioning system is equipped with a two-stage air filter. That is, the first-level air pre-filter and the first-level medium-efficiency air filter. The air-conditioning unit has two-pipe and four-pipe systems. There is only one coil in the two-pipe air-conditioning unit. In summer, circulating chilled water can be transported through the coil to cool the air-conditioning area, and in winter, circulating hot water can be transported through the coil. Supply warm air to air-conditioned areas.

In the four-pipe air-conditioning system, the water supply and return pipelines for cooling and heating are set independently, and the cold water and hot water pipelines are two independent pipeline systems. Each terminal device and air handling unit can be freely selected for Cooling or heating mode of operation. Compared with the two-pipe air-conditioning system, the four-pipe air-conditioning system is more complicated, the initial investment is high, and the building space is occupied, so it is less used in actual air-conditioning projects. The automatic control system monitors the operating parameters and operating status of the constant air volume air conditioning unit, and collects the outdoor temperature and fresh air temperature from the outdoor temperature sensor and the duct-type temperature sensor on the fresh air outlet respectively; The air humidity sensor collects the outdoor and fresh air humidity respectively; the differential pressure switch installed on the filter screen detects the pressure difference on both sides of the filter screen; the air duct air humidity sensor installed on the supply air duct and the return air duct collects the return air humidity; Use the air quality sensor installed in the air conditioning area or the return air duct to monitor the air quality; collect the wind speed measured by the air speed sensor on the air supply duct to monitor the supply air speed. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean engineering and purification workshops.

The chain control sequence when the air conditioner unit starts: fresh air damper→return air damper→exhaust damper open→supply fan start→return fan start→hot and cold water control valve start→humidification valve open. Air conditioning unit shutdown sequence control: close the humidification valve → close the hot and cold water valve → stop the blower → close the fresh air damper → close the return air damper → close the exhaust air damper. Each cooling room is provided with an air supply port and a return air outlet. After the cold air sent from the air conditioning unit enters the air conditioning clean room modular, it absorbs the cooling load in the room, and then returns to the air conditioning unit through the return air outlet for circulating cooling; the cold source of the air conditioning unit is From the chiller, the chiller provides low-temperature chilled water for the air-conditioning unit, and enters the cold water coil of the air-conditioning unit. The cold water coil is embedded and coiled in the surface cooler. The surface cooler has many fine metal holes. When one side of the cooler passes through the surface cooler, the temperature decreases, and cold air is sent to the air-conditioned area through the air outlet. The fresh air unit mainly deals with outdoor air, while the air-conditioning unit uses both fresh air and return air. Due to the use of return air, the operation of the air-conditioning unit is much better than that of the fresh air unit. It is relatively complex, including the control of indoor air quality, mainly carbon dioxide concentration. Therefore, air-conditioning units are mostly used in large-scale public areas where fan coil units cannot be installed, while fresh air units are mostly used in small-scale spaces where fan coil units are installed.

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