The direct cooling block ice machine has a long freezing time and how to solve the slow freezing
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- Time of issue:2021-01-05 15:06
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(Summary description)
The direct cooling block ice machine has a long freezing time and how to solve the slow freezing
(Summary description)
- Categories:Industry News
- Author:
- Origin:
- Time of issue:2021-01-05 15:06
- Views:
Six reasons why the freezing speed of the direct cooling block ice machine slows down
1. The surface of the evaporator is scaled, oily or dusty, and the heat transfer effect is reduced
This situation is mainly due to the fact that the equipment is not used for a long time, the water quality is not included, and the equipment is used in a poor environment.
In addition to the poor heat transfer effect of the evaporator, the surface of the evaporator has not been cleaned for a long time and the dust is too thick, and its heat transfer efficiency will also be significantly reduced.
2. The direct cooling block ice machine has a large cooling capacity loss due to poor heat preservation effect or sealing performance
Poor thermal insulation performance is due to insufficient thermal insulation layer thickness of pipes and evaporator plates, and poor thermal insulation and thermal insulation effects. It is mainly caused by improper selection of thermal insulation layer thickness in the manufacturer's design or production process. In addition, during the use of the equipment, the thermal insulation and moisture-proof performance of the thermal insulation material may be destroyed, causing the insulation layer to be damp, deformed, or even eroded, and its thermal insulation ability is reduced. The heat preservation and sealing performance is poor, and more hot air enters the equipment from the leak. Generally, condensation occurs around the equipment insulation, which indicates that the seal is not tight.
3. There is more air or refrigerating oil in the evaporator of the direct cooling block ice machine, and the heat transfer effect is reduced
Once more refrigerant oil is attached to the inner surface of the heat transfer tube of the evaporator, its heat transfer coefficient will be reduced. Similarly, if there is more air in the heat transfer tube, the heat transfer area of the evaporator will decrease, and the heat transfer will be reduced. The efficiency will also decrease significantly, and the freezing effect will be slowed down accordingly. Therefore, in daily operation and maintenance, attention should be paid to timely removing the oil on the inner surface of the evaporator heat transfer tube to improve the heat transfer efficiency of the evaporator.
4. The throttle valve is improperly adjusted or blocked, and the refrigerant flow is too large or too small
Improper adjustment or blockage of the throttle valve will directly affect the refrigerant flow into the evaporator. When the throttle valve is opened too large, the refrigerant flow is too large, and the evaporating pressure and evaporating temperature will also increase. The freezing speed of the direct cooling block ice machine will slow down; at the same time, when the throttle valve is opened too small or When it is blocked, the refrigerant flow will also decrease, and the cooling capacity of the system will decrease accordingly, and the freezing speed will also slow down. Generally, you can judge whether the throttle valve refrigerant flow is appropriate by observing the evaporating pressure, evaporating temperature, and frosting of the suction pipe. Throttle valve blockage is an important factor affecting refrigerant flow. The main reasons for throttle valve blockage are 5. Ice blockage and dirty blockage. The ice blockage is due to the poor drying effect of the dryer. The refrigerant contains moisture. When it flows through the throttle valve, the temperature drops below 0°C. The moisture in the refrigerant freezes and blocks the throttle valve hole; dirty blockage is Due to the accumulation of more dirt on the inlet filter of the throttle valve, the flow of refrigerant is not smooth, causing blockage.
Sixth, the compressor efficiency is low, and the cooling capacity cannot meet the ice making load
Due to the long-term operation of the compressor, the wear is serious, the gap of the compression equipment is increased, and the sealing performance will be correspondingly reduced. When the cooling capacity is less than the ice-making heat load, the ice-making efficiency will decrease. The refrigeration capacity of the compressor can be roughly judged by observing the suction and discharge pressure of the compressor. If the refrigeration capacity of the compressor decreases, the common method is to replace the cylinder liner and piston ring of the compressor. If the replacement still does not work, other factors should be considered, and even the machine should be disassembled for maintenance and troubleshooting.
Seven, the amount of refrigerant in the system is insufficient, and the refrigeration capacity is insufficient
There are two main reasons for the insufficient refrigerant circulation. One is the insufficient refrigerant charge. At this time, only a sufficient amount of refrigerant needs to be added. Another reason is that there are many refrigerant leaks in the system. In this case, you should first find the leaks, and focus on checking the connections of the pipes and valves. After the leaks are repaired, they can be filled with sufficient refrigerant.
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