An air-cooled chiller is a machine designed to cool water, consisting of a compression refrigeration cycle whose condenser is cooled by air that is driven by powerful fans.
Air-Condensed Chiller And Its Operation
This is how an air-cooled chiller works:
An air-cooled chiller consists of a compression refrigeration cycle. The basic components of the refrigeration cycle are the evaporator, compressor, condenser, and expansion valve. The refrigerant found in the evaporator is sucked by the compressor, causing a low pressure at this point. Since the pressure in the evaporator is low, so is its temperature. Moreover, since the refrigerant has a low temperature, it can cool a flow of water that passes near the evaporator. The heat of the water that is cooling passes to the refrigerant. In this way, the water becomes ice water and the refrigerant transforms from a liquid to a gaseous state.
Now, the refrigerant is in the evaporator, separated from the water; these two fluids never mix because they are located in different pipes. The water goes out to heat the buildings or goes to the machines that need to be cooled. The sucked refrigerant enters the compressor where its pressure increases and is directed toward the evaporator. The refrigerant reaches the condenser where it is cooled by ambient air, which is blown through powerful fans. The cooling of the air in the condenser causes the refrigerant that arrived in a gaseous state to return to its liquid state. After that, the refrigerant leaves the condenser at near room temperature, at high pressure, and in a liquid state. The liquid refrigerant reaches the expansion valve where it loses its pressure. Now, the refrigerant has low pressure which allows it to recover its low temperature. The refrigerant finally enters the evaporator to continue the cycle.
When Is The Purchase Of Air-Cooled Chillers Recommended?
40% of currently installed air-cooled chillers have less than 100 KW. Moreover, 70% of currently installed air-cooled chillers are less than 200 KW. The purchase of air-cooled chillers is recommended in the following instances:
- When the appropriate water resource is not available
- When space is limited for installation
- If constant maintenance personnel are not available
- The electrical consumption of chillers with air condensers is higher, especially in environments with low relative humidity and high temperature
- The best-selling air-cooled chiller is the one with a scroll compressor
- Potential applications for air-cooled chillers include offices, schools, small shopping malls, and medical centers
- Air-cooled chillers are fully factory assembled, making installation easier and cheaper
- Multiple chillers can be used together to meet higher cooling requirements
- Air-cooled chillers are manufactured by two types of compressors - scroll and screw
- Scroll compressors are often used on smaller air-cooled chillers, up to approximately 140 tons of capacity.
- Air-cooled screw compressor chillers are available with capacities starting at approximately 80 tons.
Conclusion
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