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For long-term use of cold storage room, various technical indicators must be checked regularly and adjusted in time. The operating temperature and pressure of the cold storage system, as well as the amount of lubricating oil and refrigerant, must be checked and adjusted in time. The system should have automatic control and compressor alarm devices. Once there is a problem, an alarm will be issued, or an automatic protective shutdown and the compressor will stop. Here are 7 common problems and solutions for the use of cold storage room.
1. The installation environment and maintenance of the air cooler
The location and environment of the air cooler inside the cold storage will affect its operation. Generally, the air cooler near the cold storage door is prone to condensation and frost. Although the air cooler can automatically heat and defrost at regular intervals, if the door is opened too frequently, the opening time is too long, the time and quantity of hot air entering is long, the defrosting effect of the fan is not good. Because the defrosting time of the air cooler cannot be too long, otherwise the cooling time will be relatively shortened, the cooling effect will not be good, and the storage temperature cannot be guaranteed.
2. Drainage of the melted water during the defrosting of the air cooler
This problem is related to the severity of the frosting. Due to the severe frosting of the fan, a large amount of condensate will inevitably be produced. The fan's drain pan cannot bear it, and the drainage is not smooth, and it will leak and flow to the ground in the warehouse. If there are goods stored below, the goods will be soaked. In this case, a thicker draft tube can be installed to remove the condensate.
Some air coolers have the problem of blowing water from the fan and spraying it on the stock in the warehouse. This is also the frosting problem of the fan in the cold and heat exchange environment, mainly due to the condensate generated by the fan leaf in the hot environment, rather than the problem of the defrosting effect of the fan itself.
3.the problem of the condenser fan motor and the electric heating tube of the air cooler
This is a vulnerable part. The fan motor that runs for a long time in a high temperature environment may malfunction and be damaged. If the guaranteed temperature of the cold storage is very important, some vulnerable parts should be ordered for timely maintenance.
4. the ambient temperature of the condenser
The condenser is generally installed on the roof of an outdoor building. In an environment with a high temperature in summer, the temperature of the condenser itself is very high, which increases the operating pressure of the unit. If there is a lot of hot weather, you can add a pergola on the roof condensation to block the sun and reduce the temperature of the condenser, so as to reduce the pressure of the machine, protect the unit equipment, and ensure the temperature of the cold storage. Of course, if the unit capacity is sufficient to ensure the storage temperature, there is no need to build a pergola.
5. The problem of low compressor efficiency
Due to the long-term operation of the compressor, the cylinder liner, piston ring and other parts will be severely worn and the fit clearance will increase. The sealing performance will be correspondingly reduced. The compressor's air delivery coefficient will also be reduced, and the cooling capacity will be reduced. 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 drops, the common method is to replace the cylinder liner and piston ring of the compressor.
6. there is a problem of more air or refrigerated oil in the cold storage evaporator
Once more refrigerating oil is attached to the inner surface of the heat transfer tube of the cold storage evaporator, its heat transfer coefficient will decrease. Similarly, if there is more air in the heat transfer tube, the heat transfer area of the evaporator will decrease, and its heat transfer coefficient will decrease. The thermal efficiency will also drop significantly, and the temperature drop rate of the warehouse will slow down accordingly. Therefore, in daily operation and maintenance, attention should be paid to timely removing oil stains on the inner surface of the heat transfer tube of the evaporator and exhausting the air in the evaporator.
7. the cold storage throttle valve is improperly adjusted or blocked, the refrigerant flow is too large or too small
When the throttle valve is opened too large, the refrigerant flow is too large, and the evaporating pressure and evaporating temperature will also increase, and the temperature drop rate of the warehouse will slow down; at the same time, when the throttle valve is opened too small or blocked, the refrigerant The flow rate also decreases, the cooling capacity of the system also decreases, and the temperature drop rate of the warehouse will also slow down.
Generally, it can be judged whether the refrigerant flow rate of the throttle valve is appropriate by observing the evaporating pressure, evaporating temperature and frosting of the suction pipe. To Clogging is an important factor that affects the flow of refrigerant. The main cause of throttling valve blockage is ice blockage and dirty blockage.
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 caused by the accumulation of more dirt on the inlet filter of the throttle valve, and the flow of refrigerant is not smooth, resulting in blockage.
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