The central air-conditioning system mainly consists of a refrigerator, a cooling water circulation system, a chilled water circulation system, a fan coil system and a cooling tower.
The working principle of the central air-conditioning system is as follows:
The refrigeration machine compresses the refrigerant into a liquid state through the compressor and sends it to the evaporator for heat exchange with the chilled water to cool and freeze the chilled water. The pump sends the chilled water to the cooling coil at each fan outlet, and is blown by the fan to achieve cooling. The evaporated refrigerant releases heat in the condenser and becomes a gas. The cooling pump sends the cooling water to the cooling tower, where the water tower fan sprays and cools it. It exchanges heat with the atmosphere and dissipates the heat into the atmosphere. go. Extended information
Water-cooled central air conditioner consists of four major components, compressor, condenser, throttling device, and evaporator. The refrigerant circulates through the above four major components in turn. The refrigerant (refrigerant) coming out of the compressor has high temperature The high-pressure gas flows through the condenser to cool down and reduce pressure. The condenser takes the heat to the cooling tower through the cooling water system and discharges it. The refrigerant continues to flow through the throttling device and becomes a low-temperature and low-pressure liquid. It flows through the evaporator, absorbs heat, and then passes through the evaporator. compression.
The working principle of the fan coil air conditioning system is to continuously circulate the indoor air with the help of the fan coil unit, so that it can be cooled or heated through the coil to maintain the required temperature and a certain relative humidity of the room. . The cold or hot water used by the coil is supplied by a centralized cold source and heat source.
Compared with the centralized system, the fan coil air conditioning system does not have large air ducts, only water pipes and smaller fresh air ducts. It has the advantages of easy layout and installation, small building space occupation, and good individual adjustment. It is widely used in comfort air conditioners where temperature and humidity accuracy requirements are not high, the number of rooms is large, the rooms are small, and individual control is required.
Reference materials: Central air conditioning (air conditioning system) Baidu Encyclopedia