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Classification of air conditioning systems
Central air conditioning system
The cold and heat sources of this system are centralized in the refrigeration station and boiler room, and the air handling equipment is centralized to form an air conditioning box, which is set in the machine room. The air is distributed through air conveying pipes, air distribution devices, and automatic control devices to regulate indoor air parameters. Applicable to shopping malls, office buildings, airports, stations, theaters, etc.
Semi centralized air conditioning treatment system
This system has a centralized set of cold and heat sources, and the centralized set of air conditioning fresh air fan handles the fresh air. There are also secondary treatment devices distributed in air-conditioned rooms to independently treat indoor air or further supplement air from centralized treatment equipment.
For example: fan coil plus fresh air system; Multi split plus fresh air system. Applicable places: office buildings, laboratories, IT machine rooms, etc
Decentralized air conditioning treatment system
This system, also known as local air-conditioning system, centralizes the cold and heat sources, air handling equipment and air transmission pipes in one air-conditioning unit, and the air in each room is separately treated by its own integral or split air conditioner. Such as fan coil unit, split air conditioner and cabinet air conditioner. Applicable places: guest rooms, residences, IT machine rooms, etc.
All air system
The heat and humidity loads of air-conditioned rooms are all borne by the centrally treated air. Generally, such air conditioning systems occupy large building space. Applicable places: shopping malls, stations, theaters, airports, workshops, clean rooms, etc.
All water air conditioning system
The heat and humidity loads of air-conditioned rooms are all borne by cold and hot water. The system itself has no ventilation device to ensure the air quality in the room, and additional ventilation device is required. Applicable to guest rooms, hotels, inpatient departments, etc.
Air water air conditioning system
The heat and humidity load of the air-conditioned room is shared by the treated air and water. In such systems, the treated air generally bears the fresh air load required for ventilation in the air-conditioned room, and the treated water bears the heat and humidity load in the air-conditioned room. Applicable places Laboratory, office building, dining area, etc.
The heat and humidity load of the air-conditioned room is directly borne by the refrigerant inside the evaporator (summer) and condenser (winter) in the air-conditioned room. Common split air conditioners, cabinet air conditioners and multi split air conditioners. Applicable to residence, guest room, network machine room, power distribution room, etc.
Closed system The air handled by the air conditioning box of this system is all the recirculated air from the air-conditioned room. Less energy loss and poor air quality. It is applicable to underground combat readiness projects, unmanned places and warehouses where few people enter.
All the air processed by the air conditioning box of this system comes from the outside, and is discharged to the outside after absorbing the residual heat, moisture and indoor harmful gas. It is applicable to places where return air is not allowed. Such as laboratories, clean rooms, nuclear plants, and workshops that emit a lot of harmful gases. The system has large energy consumption and good air quality. Heat recovery unit can be installed.
Return air system
The air handled by the air conditioning box of this system is part of outdoor fresh air and part of indoor return air, which not only meets the sanitary conditions, but also is economical and reasonable, and has a wide range of uses. According to the number of return times, it can be divided into primary return air system and secondary return air system. It is applicable to office buildings, shopping malls, theaters and other places.
The primary air return system is an air conditioning system in which outdoor fresh air and indoor return air are mixed before entering the air conditioning box.
As the name implies, the secondary return air system is that indoor return air is used twice. The primary return air is mixed before entering the return air box, and the secondary return air is mixed with the primary return air after the air conditioning box. The secondary return air can replace the reheater. However, the dew point temperature of the machine is low, and the efficiency of the refrigerator decreases.
Determination of fresh air volume Fresh air volume of air conditioning system refers to a certain amount of outdoor fresh air that must be sent to ensure the air quality of air-conditioned rooms. Its size is related to indoor air quality and energy consumption.
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