Explain a refrigerant shortage analysis: chillers are responsible for providing ice water (control water temperature at 0~35°C, or 0~-40°C). Many users need continuous operation for 24 hours. Therefore, the unit should not have any problems. . However, no matter which type of chiller is used, once the usage time is too long, there will be some minor faults. For example, the first refrigerant is insufficient.
Insufficient refrigerant chillers may cause problems:
1. If the unit refrigerant is insufficient, the suction pressure and exhaust pressure of the chiller refrigeration compressor are lower than the normal value.
2. If the refrigerant is insufficient, the evaporation in the evaporator decreases, and the cooling capacity decreases, resulting in a poor cooling effect.
3, will make the thermal expansion valve does not frost or rarely frost. In the air condition, no condensation or little or no condensation.
4, will cause the evaporator rarely frost or frost. In the air condition, no condensation or little or no condensation.
5, due to lack of refrigerant, often make the compressor does not operate under the rated load, causing the chiller light load or even idling, and at this time the current is lower than the rated current.
The lack of refrigerant in the chiller will cause many problems. What about the refrigerant charge? What is the key to causing the shortage of refrigerant in chillers? The temperature control analysis in Dechang has the following possibilities:
1. The refrigeration system of chillers is not filled with refrigerant as required, resulting in insufficient refrigerant.
2. The air tightness of the system of the unit resulted in refrigerant leakage.
3, improper operation and maintenance, causing refrigerant leakage and so on.
Explain the reasons for the analysis of the ice blocking in the second system: The commonly used industrial refrigeration equipment in various industries - chillers are mainly divided into air-cooled chillers and water-cooled chillers. The chiller generates "ice block", which refers to the thermal expansion valve. In the throttling device, moisture freezing occurs and clogging occurs, causing the unit to shut down.
For a chiller refrigeration cycle system using Freon as a refrigerant, since the Freon refrigerant and the water are insoluble, the free water is separated from the freon when the freon containing water passes through the thermal expansion valve. Freeze and block pipes and valves. Freon, on the other hand, has poor chemical stability in the presence of water and is prone to acidic materials, corroding the chiller piping and interior surfaces. Therefore, for the Freon refrigeration system, its water content is expressed in terms of mass fraction and must not exceed 0.0025%.
The chiller Freon refrigeration system water mainly comes from the following situations:
1. After the system is installed, the internal air is not exhausted and there is moisture;
2, enter the air when overhaul and charge fluorine;
3, low pressure part of the leak, when the pressure is lower than the local atmospheric pressure into the air;
4, Freon itself is impure, containing water and other factors.
Therefore, before the refrigeration system of the chiller is charged with the refrigerant, it is necessary to perform the drying work and install the dry filter in the Freon refrigeration system. For the dry filter installed in the system, due to the long running time, the poor absorption of moisture must be promptly replaced. Dechang chiller will be filled with refrigerant and lubricating oil before leaving the factory. If the fault occurs during the operation of the unit, it is necessary to charge the refrigerant. It is recommended to contact the chiller manufacturer for processing to ensure safe and reliable operation of the unit.
Johnson Machinery Tips: When the chiller refrigerant is found to be insufficient, the entire system should be strictly inspected to determine the cause or the location of the leak, so as to eliminate the fault, in accordance with the provisions of the refrigerant to make it return to normal operation. For the chiller refrigeration system, as long as the unit is installed correctly and reliably, there is no leakage at the pipe joints, etc., and the system can operate effectively for a long period of time, without the need for additional refrigerant. When there is leakage of refrigerant, first try to solve the leakage and then replenish the refrigerant so that the chiller can operate without failure.
