High Efficient Copper Tube Finned Evaporator for Cooler

Anti-freezing type table cooler evaporator manufacturers of industrial water air conditioning table cooler coil condenser

Evaporator maintenance
1, often the evaporator leakage detection work. Leakage is a common failure phenomenon of the evaporator, in the process of use should pay attention to frequent leakage detection.
Ammonia evaporator leakage, there is an irritating odor, leakage point is not frost. The leak can be checked with phenolphthalein test paper, because ammonia is alkaline, meet phenolphthalein test paper becomes red. With the eye, generally in the evaporator somewhere not frost is usually the leak, but also in the leak with soapy water to find the leak.
Freon evaporator leakage check can use halogen lamps and halogen leak detector, can also use soapy water to find leaks. When checking the first eye to see if there is oil on the evaporator tube, because Freon and oil can be mutually soluble, Freon leaks, oil will also seep out of the leak, therefore, where there is oil, where the leak. Leak detection with a halogen lamp, if there is a Freon leak, the halogen lamp burning flame from the blue into a light green, light green, grass green, purple green, purple and other colors to determine the amount of Freon leakage. If the flame is dark green or purple, the flame in the phosgene is toxic, can not be used for a long time to check this method. In this case, soapy water can be used to check the leakage point. For trace leaks, should use halogen leak detector for leak detection.
2, often check the evaporator frost condition. When the frost layer is too thick, it should be defrosted in time. When the frost is abnormal, it may be caused by the blockage, should find the reason and be excluded in time.
3, the evaporator is out of service for a long time, the refrigerant will be clumsy to the reservoir or condenser, so that the pressure of the evaporator to maintain at 0.05MPa (gauge pressure) is appropriate. If the evaporator in the salt water pool, but also need to use tap water flushing, flushing in the pool after filling with tap water.

Frost impact
1, frost on the refrigeration system
Cold storage refrigeration system normal operation of the evaporator surface temperature is much lower than the dew point temperature of the air, food and moisture in the air will precipitate and condense on the tube wall. If the tube wall temperature is below 0 ° when the water dew is condensed into frost. Frost is also the result of normal operation of the refrigeration system, so the evaporator surface allows a small amount of frost.
Because the thermal conductivity of the frost is too small, it is one percent of the metal, or even a few hundredths of a percent, and thus the frost layer forms a larger thermal resistance. Especially when the frost layer is thicker, as if the insulation, so that the evaporator in the cold is not easy to emit, affecting the refrigeration effect of the evaporator, and ultimately make the cold storage can not reach the required temperature. At the same time, the evaporation of refrigerant in the evaporator should be weakened, incomplete evaporation of ammonia liquid may be sucked by the compressor and cause liquid shock accident.
2, frost on the local environment
There are many methods of frost melting, such as artificial frost sweeping, refrigerant hot melt frost, water frost melting, electric heat frost melting and so on. For smaller refrigeration systems, artificial defrosting and electric melting can be used, but should be carried out when the system stops running. For larger refrigeration systems, the refrigerant heat melt frost and water melt frost should be used. Due to the compressor exhaust thermal frost heat source, so the refrigerant thermal frost should be in the refrigeration system under the condition of operation. So it seems that no matter what kind of frost melting way, are to affect the temperature of the cold storage, especially the refrigerant hot melt frost, because it is necessary to sub-depot, that is, a part of the depot stop refrigeration, and the other part of the depot frost melting, frost melting time is longer, the impact on the temperature of the depot is also greater if the temperature fluctuation is too large, will affect the quality of the food in the depot, especially the quality of fresh food. And melt off the frost should be cleaned up in time, otherwise it will cause the freezing of the warehouse floor.