Common charging refrigerant refrigeration equipment method and deficiency

common refrigerant filling method and lack of:

1, hand contact suction, exhaust pipe, copper pipe perception of heat and cold; Everyone to the feeling of hot and cold, if your hands are long calluses, you perceive had higher temperature than the practice. General human feel is very hot, about 37 ℃ higher than the below 37 ℃ feeling is cool. Skin temperature limit for 49 ℃ of perception, so your hand perception of metal tube temperature of indeterminacy of dispute is really temperature.

2, investigate the bubbles in the liquid lens; There are air bubbles shows shortage of refrigerant, but liquid pipe pressure loss also can cause bubbles. If the liquid pipe pressure loss is very big, the liquid refrigerant will flash as gas, flash gas flow in expansion valve will cut the flow of refrigerant will erode expansion valve. Supercooling degree is small, if the system pressure loss is simple in sight to see in the mirror of bubbles. This moment to continue filling refrigerant to eliminate air bubbles, you will find that the high pressure rise and cause a jumping machine. Obviously this method can not correctly judging system of refrigerant injection quantity. 3, measurement of concave and convex pressure; In the process of refrigeration system maintenance of protection, the traditional dual pressure table is all over, the dual pressure table there will be wrong. Many dual pressure table using the calibration for a period of time will be a pointer, as otherwise the dial reading read from and often present pointer swing. Pressure after spend must find full temperature point, and real time full temperature could not be completely accurate, finally also will present the heat/cold degree value error, this method can only see the status of system in the past period of time, rather than the condition of real-time operation. But the refrigerant filling quantity and heat/cold degree is the key parameter of system operation. 4, the measurement of compressor current; Use more this way, but note that the test current is different in different circumstances, such as current acceptor power supply voltage, voltage error caused by the influence of current error, the refrigerant filling caused by excessive current change, such as 5, and calculated the heat; 6, investigation on the suction pipe condensation conditions; If the evaporator air volume is normal, found that the refrigerant according to the load change through the evaporator, tube to prevent the frost formation. If the load reduction, the liquid refrigerant will flow through the evaporator, enters the suction, surrounding the water vapor in the air condenses on the copper tube. If you have meet the liquid refrigerant, tube will attack. But when thermodynamic expansion valve system, dew tube does not suggest that the refrigerant charged note amount is too much, the reason is that will take the initiative to regulate the temperature of the expansion valve. Visible investigation discriminant filled volume of the refrigerant suction frost is not scientific, weighing note 7. Weighing filling method need to manufacturers on the nameplate indicates the filling amount, but in the process of practice, there are many refrigeration equipment self-assembly, filled volume of the no mark, and filling refrigerant on many online, need accounting refrigerant filling amount, this method of calculation is too complicated.

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