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The water-cooled chiller belongs to the refrigeration unit part of the central air conditioning system, whose refrigerant is water, called the chiller, and the cooling of the condenser is achieved by using the heat exchange and cooling of normal temperature water. Therefore, it is called a water-cooled unit, and the opposite of the water-cooled unit is called an air-cooled unit, and the condenser of the air-cooled unit is cooled by forced ventilation and heat exchange with the outdoor air.
1, screw chiller: screw chiller is a large and medium-sized refrigeration equipment to provide frozen water, screw chiller is a complete refrigeration system composed of screw refrigeration compression and group, condenser, evaporator and automatic control components and instruments. It has the advantages of compact structure, small size, light weight, small footprint, easy operation and maintenance, smooth operation and so on, so it has been widely used, its single cooling capacity from 150 to 2200KW, suitable for medium and large projects.
2, centrifugal chiller: Centrifugal chiller is a kind of efficient, large-capacity refrigeration equipment, especially suitable for large and oversized engineering projects. It is mainly composed of centrifugal refrigeration compressor, evaporator, condenser, throttle control device and electrical control system, a wide range of single cooling capacity, from 700kW to 4200kW. The centrifugal refrigeration compressor compresses the refrigerant through a high-speed rotating impeller, which significantly improves the cooling capacity and efficiency of the system. Evaporator and condenser are usually full liquid horizontal shell and tube design, ensuring efficient heat exchange performance.
Water cooled chiller and air cooled chiller, the difference between the two mainly lies in the difference of the condenser. The condenser of the water cooler mainly circulates the cooling water to take away the heat. Unlike water-cooled chillers, air-cooled chillers use fans for heat dissipation. Fin type condenser is usually used, fin actually refers to aluminum, will need to heat the part of the external installation of aluminum, in order to achieve efficient heat dissipation, and then through a strong fan to heat out.
1, module machine: Developed on the basis of VRV system, it changes the traditional freon pipeline into a waterway system, combines the indoor and outdoor units into refrigeration units, and changes the indoor unit to fan coil. The cooling process is realized by heat transfer of refrigerant water. The modular machine gets its name because it can automatically adjust the number of starting units according to the requirements of cooling load and realize flexible combination.
2, air-cooled heat pump unit Air-cooled heat pump unit is a compressor, heat exchanger (including evaporator and condenser), throttling device and other auxiliary components of the system. In the refrigeration mode, the refrigerant is compressed into high temperature and high pressure gas under the action of the compressor, and then enters the wind side heat exchanger (used as a condenser at this time), where the heat is released to the outside air, and cooled into liquid. Next, the liquid refrigerant passes through the throttle valve and depresses into the water-side heat exchanger (now used as an evaporator), absorbs heat from the system and evaporates into a gaseous state, and finally returns to the compressor to complete a cycle. The heating mode is the reverse operation of the above process, through the four-way reversing valve to change the flow of refrigerant, so that the original condenser into the evaporator, the evaporator into the condenser, so as to transfer the heat in the air to the water for indoor heating.
The characteristic of the air-cooled heat pump unit is that it can be used for both summer cooling and winter heating, which realizes the integration of cold and heat sources of the air conditioning system, so it is very suitable for users who have heating and cooling needs at the same time. In addition, because it does not need to set up boiler room and freezer room, it can save construction investment; And for water-scarce areas, the use of air-cooled systems instead of cooling water systems is also a great advantage.
3, multi-online multi-online central air conditioning commonly known as "one drag more", refers to an outdoor unit through the pipe connected to two or more indoor units, easy to install beautiful, flexible and convenient control.
The primary refrigerant air conditioning system adopts the form of air-cooled heat transfer on the outdoor side and direct evaporative heat transfer on the indoor side. Compared with the general central air conditioning, it avoids the problem of large energy consumption, so the multi-line central air conditioning is more energy saving.
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