Excuse me, what do EA, QA, SA and RA stand for in the air conditioning system?

In the ventilation system diagram, FA, SE and EA respectively represent: FA fan, SA for air supply, RA for return air, EA for exhaust air, OA for fresh air, FYB rain-proof louver air outlet, GFK efficient air outlet and QA quality assurance.

Air conditioning system is a system that manually processes the temperature, humidity, cleanliness and airflow speed of indoor air. In some places, air with certain temperature, humidity and air quality can be obtained to meet the requirements of users and production processes and improve labor hygiene and indoor climate conditions.

Extended data:

Classification of air conditioning system:

Central air conditioning: all air handling equipment (fans, filters, heaters, coolers, humidifiers, dehumidifiers and refrigeration units, etc.). ) are concentrated in the air-conditioning room, and after air treatment, they are sent to each air-conditioning room through air ducts. The heat source and cold source of this air conditioning system are also centralized. It handles a large amount of air, runs reliably and is easy to manage and maintain, but the computer room occupies a large area.

Semi-centralized air-conditioning: the air handling equipment in the centralized air-conditioning room only handles a part of the air, and the scattered air-conditioning rooms also have air handling equipment. They either treat indoor air locally, or supplement and reprocess air from centralized treatment equipment. Induction system, fan coil unit and fresh air system are typical examples of this semi-centralized air conditioning system.

Local air conditioning: This system disperses all air handling equipment in air-conditioned rooms, so the local air conditioning system is also called distributed air conditioning system. All kinds of air conditioners commonly used belong to this category.

Will the air conditioner? Indoor air treatment equipment, indoor fan, etc. The cold and heat sources and the refrigerant output system are respectively concentrated in a box. Distributed air conditioning only transports cold and hot carriers indoors, and the air is treated in indoor fan coil units.