A system that deals with the temperature, humidity, cleanliness, and air velocity of indoor air by artificial means. The air with certain temperature, humidity and air quality can be obtained in some places, so as to meet the requirements of users and production process and improve labor health and indoor climate conditions.
01
Classification
Central air conditioning
All air treatment equipment (fans, filters, heaters, coolers, humidifiers, dehumidifiers, refrigeration units, etc.) are centralized in the air conditioning room. After air treatment, they are sent to each air conditioning room by air pipes. The heat and cold sources of this air conditioning system are also centralized. It has large air handling capacity, reliable operation, easy management and maintenance, but the machine room covers a large area.
Semi central air conditioning
The air treatment equipment concentrated in the air conditioning room only deals with a part of the air. In addition, there are air treatment equipment in the scattered air conditioning rooms. They either process the indoor air locally or supplement and reprocess the air from the central processing equipment. Induction system, fan coil + fresh air system are typical examples of this semi centralized air conditioning system.
Local air conditioning
This system disperses all the air-conditioning equipment in the air-conditioned room, so the local air-conditioning system is also called the decentralized air-conditioning system. The various air conditioners commonly used belong to this category. The air conditioner concentrates the indoor air treatment equipment, indoor fans, cold and heat sources and refrigerant output systems in one box. The distributed air conditioner only transports heat and cold carrier to the room, and the air is processed in the fan coil in the room.
02
Divide
By medium
All air system: this kind of system is that the cooling and heating loads of air-conditioned rooms are all borne by the treated air. The central air conditioning system is the all air system.
All water system: this system is the air conditioning room's cooling and heating loads all rely on water as a hot and cold medium to bear. It can not solve the ventilation problem of the room, and is not used alone. Fan coil without fresh air belongs to the whole water system.
Air water system: this kind of system is based on air and water to bear the cooling and heating load of air-conditioned room. Fan coil plus fresh air system is such a system.
Refrigerant system: the cooling and heating load of the air-conditioning room of this system is directly borne by the refrigerant of the refrigeration system, and the local air-conditioning system belongs to this type.
By category
Direct evaporation system: the refrigerant evaporates directly in the cooling coil and absorbs the air heat outside the coil. It is suitable for the occasions where the air conditioning load is small and the air conditioning room is relatively concentrated.
Indirect cooling system: the refrigerant evaporates and absorbs heat in the special evaporator, cooling the chilled water (also known as refrigerant water). The chilled water is delivered to the special water-cooled surface cooler by the water pump to cool the air. It is suitable for the occasions with large air conditioning load, scattered rooms or high requirements of automatic control.
Air volume
DC system: also called brand new air conditioning system. The air processed by the air conditioner is brand-new air, which is sent to each room for heat and humidity exchange and then discharged to the outdoor without return air pipe. The system has good sanitary conditions, large energy consumption and poor economy, and is used in workshops where harmful gases are produced. Laboratory, etc.
Closed system: the air processed by the air conditioning system is recycled completely, and the system does not supplement the fresh air. The energy consumption of the system is small and the sanitary conditions are poor. It is necessary to regenerate the oxygen in the air and prepare the carbon dioxide suction device. Such as air conditioning for underground buildings and submarines.
Hybrid system: the air processed by the air conditioner is composed of return air and fresh air. It has the advantages of both direct current type and closed type. It is widely used, such as air conditioning system in hotels, theaters and other places.
At present, the main forms of air conditioning system in China are constant air volume all air system, fan coil plus fresh air system and variable air volume all air system. From the perspective of parameter adjustment, the existing energy-saving control methods of air conditioning system mainly include variable air volume control, variable air temperature and humidity control and variable fresh air ratio control.
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