1, difference:
Different types of media used to withstand indoor loads
All-air system is a system composed entirely of air, which bears the cold, heat and humidity loads of the room.
Air-water system is a system in which air and water share the indoor cold, heat and humidity loads.
2. Different working methods
The whole air system delivers cold and hot air to the room, providing sensible heat, latent heat and heat. The air processor in the central air-conditioning room completes cooling and dehumidification. Supplementary cooling is no longer carried out indoors: however, heating can be done in the machine room or room.
Air-water system not only provides indoor treated air, but also has air treatment equipment with water as the medium.
3. Different institutional forms
The whole air conditioning system room is generally located outside the air conditioning room, such as basement, roof room, auxiliary room, etc.
Air-water system
Fan-water fan coil system-indoor fan coil;
Feng shui induction system: install induction tube (with coil) indoors;
Radiant plate of air-water radiant tube system is installed in the room.
4. Similarities:
Both of them are air conditioning systems, and there are two circulation systems: chilled water and cooling water. The working principle and equipment installation configuration of the two circulating cooling water systems are basically the same.
Extended data:
Air-conditioned water system is a system in which air and water share the cold and heat load of air-conditioned rooms. In addition to sending the treated air into the room, the room is also equipped with terminal equipment to cool or heat the indoor air with water as the medium.
In an all-air system, in order to adjust the room temperature, heating coils (hot water, steam or electricity) are sometimes installed in rooms or terminal equipment (such as VAV terminal equipment). This system does not belong to the air-water system, but it still belongs to the whole air system.
All-air system is a system in which air completely bears the room cooling load.
All-air conditioning system provides sensible heat and latent heat to the room by conveying cold air, or hot air provides heat to the room. The cooling, dehumidification, heating and humidification of air are all concentrated in the air conditioning unit in the air conditioning room, and no supplementary cooling is carried out indoors. The air sent to the room can be heated in the air-conditioned room or in each room.
The air treatment of the whole air conditioning system is basically completed in the air conditioning room. This system needs a lot of air, so the cross section of the air duct is very large.
Central air conditioning system generally belongs to this kind of system. The computer room of central air conditioning system is generally located outside the air conditioning room, such as basement, roof room or other auxiliary rooms. All-air central air conditioning system can provide services for one or more rooms or certain areas of rooms.