Archive for July, 2012
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Basically the principle of water cooled chiller as the cooling systems such as air conditioning which consists of several main components, namely evaporator, condenser, compressor and expansion device. In the evaporator and condenser heat exchange takes place. In the water cooled chiller water contained as secondary refrigerant to take heat from the material being cooled to the evaporator. This water will experience temperature changes when heat absorbed and released in the evaporator.
In general working principle is as follows. Refrigerant is compressed in the compressor and then flows into the condenser. Refrigerant that flows into the condenser has a high pressure and temperature. Refrigerant in the condenser is cooled by outside air around the condenser so that the phase change from vapor to liquid. Then, the refrigerant flows into the capillary tube and a decrease in pressure.
Once out of the capillary tube, the refrigerant into the evaporator. In the evaporator the refrigerant begins to evaporate, this was due to a decrease in pressure that resulted in the boiling point of refrigerant to be lower so
refrigerant evaporates. In the evaporator refrigerant changes phase from liquid to vapor. In the evaporator heat transfer which occurs a low temperature, where the water is cooled by a refrigerant. Then the refrigerant in the vapor are supplied to the compressor again.
In the evaporator, water as a secondary coolant which has been cooled to a certain temperature and then drained by a pump to the cooling coils in the room. This water will circulate continuously for system
In a refrigeration system, refrigerant is ideal minimal following properties:
A. Evaporation of positive pressure
Positive pressure to prevent evaporation of the possibility of leakage of air into the system during during the operation.
2. Freezing pressure is quite low.
3. Freezing temperature must be low enough,
Refrigerant so that compaction does not occur during normal operation.
4. Lubricating oil solubility
Oils used as lubricants in the refrigerator, especially on the system, should be easy to dissolve, because it contact with refrigerant.
5. Refrigerant is low.
6. Not combustible.
Refrigerant vapor can not burn or fire resulting in any concentration with air.
7. Have condensation pressure is not too high,
Due to the high condensation pressure compressor requires a large and powerful, as well as the pipes have to be strong and the possibility of very large leaks.
8. High dielectric strength.
This trait is important for hermetic compressor, because the refrigerant vapor is directly related to the motor.
9. Has a stable chemical structure,
should not be unraveled each time compressed, condensed, and evaporated.