Chilled water air conditioning systems are commonly used in applications that need large cooling capacity such as hypermarket, industrial process, commercial air conditioning such as offices and factories. More and more homes are using this system to air conditioned their entire house because of its cost-effectiveness and no hazard of having refrigerant piped all over the house.
As its name suggest, this system makes use of water as its secondary refrigerant. Chiller is used to remove heat from the water which is then circulated through other components to absorb heat from the space.
Water is non-corrosive, has specific heat value, fluid, non-toxic and is cheap. This makes it an excellent choice compared to other secondary refrigerants such as sodium chloride brines, propylene glycols, ethylene, methanol or glycerin.
How Chilled Water Air Conditioning Works
The chiller is the section of the system where an exchange of heat occurred between the water that goes to the building and the evaporator. The water leaves the chilled water evaporator at 45°F or 7°C. This chilled-water is then circulated through the entire building by the use of a pump.
The water cooled the space and pick up the heat and returns to the chiller at about 55°F or 13°C. The water temperature has been heated up by 10°F or 6°C after cooling the space. This process is then repeated.
In most chiller applications, a water-cooled condenser uses a cooling tower to reduce the temperature of the condenser. In this case, the water loop system is separated from the chilled water that goes to the building. The water that has been cooled by the evaporated water at the cooling tower will enter the condenser at 85°F or 29°C. It picks up the heat from the condenser and leaves at 95°F or 35°C, an increase of 10°F or 6°C.
The water is then sent to the cooling tower by the use of a pump to be cooled by evaporation of the water in the cooling tower. The cooled water temperature now drops to 85°F or 29°C and enters the condenser again. This process is repeated. Water is constantly added to the cooling tower by the use of water piping to replace those that has been evaporated into the air.
See in greater details the operation and principles of a cooling tower.
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