The chiller is a water cooling device. The chiller is a cooling water device that provides constant temperature, constant current and constant pressure. The working principle of the chiller is to inject a certain amount of water into the water tank of the machine first, and then cool the water through the refrigeration system, and then the low-temperature cooling water is sent to the equipment to be cooled by the water pump, and the chilled water takes the heat away and then the temperature rises and then returns to the water. The water tank reaches the role of cooling. The cooling water temperature can be adjusted automatically according to requirements, and long-term use can save water. Therefore, it is a standard energy-saving device.
Cooling principle:
The system operates through three interrelated systems: a refrigerant circulation system, a water circulation system, and an electrical control system.
Refrigerant circulation system:
The liquid refrigerant in the evaporator absorbs the heat in the water and begins to evaporate. A certain temperature difference is formed between the final refrigerant and the water, and the liquid refrigerant is completely evaporated to a gaseous state and then sucked and compressed by the compressor (pressure and temperature increase). ), the gaseous refrigerant is absorbed by the condenser (air / water) heat, condenses into liquid, the thermostatic expansion valve (or capillary) throttled into low temperature low pressure refrigerant into the evaporator, the refrigerant to complete the cycle.
The basic components of the refrigeration system:
Compressor: The compressor is the core component of the entire refrigeration system and the source of refrigerant compression. Its function is to convert the input electrical energy into mechanical energy to compress the refrigerant.
Condenser: The condenser acts to output thermal energy and condense the refrigerant during cooling. After the high-pressure superheated steam discharged from the refrigeration compressor enters the condenser, all the heat absorbed in the working process, including the heat absorbed from the evaporator and the refrigeration compressor and in the pipeline, is transferred to the surrounding medium (water or The air is taken away; the refrigerant high pressure superheated vapor recondenses into a liquid. (Depending on the cooling medium and cooling method, the condensers can be divided into three categories: water-cooled condensers, air-cooled condensers, and evaporative condensers.)
Reservoir: The reservoir is installed after the condenser and is in direct communication with the drain of the condenser. The refrigerant liquid in the condenser should flow unimpeded into the reservoir so that the cooling area of ​​the condenser can be fully utilized. On the other hand, when the heat load of the evaporator changes, the required amount of the refrigerant liquid also changes, and at that time, the reservoir functions to regulate and store the refrigerant. For small refrigeration systems, the reservoir is often not installed, but a condenser is used to regulate and store the refrigerant.
Drying filter: moisture and dirt (oil, iron filings, copper scraps) must be prevented from entering the refrigeration cycle. The source of moisture is mainly the newly added refrigerant and trace water contained in the lubricating oil, or due to the maintenance system. The moisture that comes when the air enters. If the moisture in the system is not cleaned out, when the refrigerant passes through the throttle valve (thermal expansion valve or capillary), the moisture will solidify into ice due to the pressure and temperature drop, which will block the passage and affect the normal operation of the refrigeration unit. Therefore, a dry filter must be installed in the refrigeration system.
Thermal expansion valve: The thermal expansion valve is both a flow regulating valve in the refrigeration system and a throttle valve in the refrigeration device. It is installed between the drying filter and the evaporator in the refrigeration device, and its temperature sensing package is bandaged. At the exit of the evaporator. Its main function is to reduce the pressure of the high-pressure normal temperature refrigerant liquid when flowing through the thermal expansion valve, and become a low-temperature low-pressure refrigerant wet steam (mostly liquid, a small part is steam) enters the evaporator and vaporizes in the evaporator. It absorbs heat and achieves the purpose of cooling and cooling.
Evaporator: An evaporator is a heat exchange device that relies on the evaporation (actually boiling) of a refrigerant liquid to absorb the heat of the cooled medium. Its function in the refrigeration system is to absorb heat (or output cooling). In order to ensure a stable and long-lasting evaporation process, the vaporized gas must be continuously withdrawn by a refrigeration compressor to maintain a certain evaporation pressure.
Refrigerants: Most industries used in modern industry use R22 or R12 as a refrigerant. Refrigerant is a working fluid in a refrigeration system. Its main function is to carry heat and achieve heat absorption and heat release when the state changes.
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