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Composition and electrical control in detail!


The operation of an industrial chiller system is through three interconnected systems: a refrigerant circulation system, a water circulation system, and an electrical automatic control system.
Refrigeration cycle
The liquid refrigerant in the evaporator absorbs heat in the water and begins to evaporate. Finally, a certain temperature difference between the refrigerant and the water is formed. The liquid refrigerant also completely evaporates into a gaseous state, which is then inhaled and compressed by the compressor (pressure and temperature increase. ) The gaseous refrigerant releases heat through a condenser (air-cooled/water-cooled) and condenses into a liquid. After throttling through the expansion valve (or capillary tube), the refrigerant turns into a low-temperature and low-pressure refrigerant and enters the evaporator to complete the refrigerant circulation process.
Water cycle
The water pump is responsible for pumping the water from the tank to the equipment that the user needs to cool. The chilled water brings the heat away and the temperature rises before returning to the chilled water tank.
Electrical control
Including power supply and automatic control.
The power supply part is through a contactor and supplies power to compressors, fans, pumps, etc.
Automatic control part includes thermostat, pressure protection, delayer, relay, overload protection, etc.
The mutual combination achieves functions such as automatic start and stop of water temperature, protection and other functions.
Generally more than 10P uses water-cooled heat dissipation, and 10P uses air-cooled heat dissipation.
An air-cooled industrial chiller is generally an integral machine, with evaporators, compressors, and condensers. For a slightly higher power air-cooled industrial chiller, it is necessary to consider the heat dissipation problem of the condenser cooling fan during its operation. In the air-conditioning plant application, the whole machine needs to set the exhaust duct to guide the heat radiated by the cooling fan to the outside.
An air-cooled industrial chiller can also be used as a component, with the condenser placed directly outside (called an outdoor unit), and the evaporator and compressor placed indoors (called an indoor unit). However, taking into account the problem of heat absorption during the transfer of the refrigerant between the condenser and the evaporator, the distance between the indoor unit and the outdoor unit is preferably controlled within 6 meters. In addition, the copper pipe for transporting the refrigerant needs to be subjected to heat preservation treatment. The fan's power supply cable and control cable can be routed together with the copper pipe, so that the air-conditioning plant can only open the hole through the pipe.
For industrial applications where a small flow rate and small heat dissipation air-cooled chiller is used, the integral type is generally used. At this time, it is not necessary to consider the heat dissipation problem. For large-flow and large-dissipation air-cooled chillers, a split type can be used.
The cooling effect of the condenser of the air-cooled chiller is slightly affected by the changes in the seasonal climate of the external environment, while the water-cooled chiller adopts a water tower with a relatively stable cooling effect. It is determined that the water tower needs to be installed and the mobility is poor.
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