The most sensitive part of refrigeration equipment chillers, freeze dryers, ice machines, chromatography refrigerators, ultra-low temperature refrigerators, etc. is the temperature, the most demanding, and most part of the technology is also the temperature, thus the importance of its important indicator temperature. The temperature of the unit components has a normal temperature range. Exceeding this range is an abnormal state. The factors that cause these abnormalities may be malfunctions or incorrect adjustments, but they must be analyzed and processed or checked in time. These temperature points are difficult to measure with a thermometer, and generally can only be estimated by hand, and then judged whether it is normal.
(1) Temperature condition of the condenser
1) The temperature condition of the condenser is normal. The first half of the heat pipe is very hot, and its temperature has a slowly and slowly decreasing balance. The thermal sensitivity of the rear half of the heat pipe is greatly reduced compared with the first half, because the refrigerant in the second half of the pipe has gradually liquefied, and the condensation temperature and the supercooling temperature have been reached. When an abnormal situation occurs, one is that the first half is not too hot, and the second half is close to normal temperature (ambient temperature) because the compressor sucks the wet steam refrigerant or the refrigerant amount is insufficient. The other is that the entire condenser is very hot due to excessive refrigerant volume or low ventilation, or high ambient temperature.
2) The case of the water-cooled condenser shell-and-tube condenser is normally the upper half and the lower half is warm. Under abnormal conditions, the entire casing is not too hot, because the refrigerant is not enough. In the other case, the entire housing is very hot due to insufficient cooling water or poor heat dissipation (scale in the water pipe). Under normal conditions, the casing condenser is very hot. The reason is that the cooling water is too small or the heat dissipation effect is poor. The other is that the outer surface of the casing is not too hot, because the refrigerant is insufficient.
(2) The influence of the temperature change of the casing on the compressor and the refrigeration system The temperature field of the outer casing of the fully enclosed reciprocating piston compressor can be divided into two parts: a. The upper casing is affected by the suction vapor, the temperature is relatively low, and it is in the micro The range of heat or slightly cooler is estimated to be around 30 °C, and there is a possibility of dew condensation on the surface of the local casing around the suction pipe. B. The heat generated by the motor in the lower casing and the frictional heat carried by the frozen oil are mainly taken out of the casing by the steam.
1) The effect of high temperature of the casing and the reason why the surface temperature of the casing exceeds the normal range, mainly because the intake temperature of the refrigeration system is too high (above 15 °C). Excessive heat vapor enters the compressor and absorbs heat from the casing, causing the temperature of the vapor to rise higher, thereby raising the temperature of the casing. The temperature of the superheated vapor rises very high, and the temperature of the casing rises too high, which is unfavorable for the cooling of the oil, which affects the lubrication of the moving parts, accelerates the wear, and causes the bearing to hold the shaft (biting). It also causes the exhaust gas temperature to rise.
2) The effect of the case temperature is too low and the reason why the surface temperature of the case is lower than the normal range is because the suction temperature is too low (less than 15 °C). It is good for cooling both the refrigeration oil and the motor windings, but the cooling capacity is reduced. When the inhalation temperature is extremely low, most of the casing will be dew condensation, and there is a danger of liquid hammer. This is a fatal blow to the compressor and should be paid special attention. At the same time, a large amount of refrigerant is dissolved in the frozen oil, which is not conducive to the lubrication of moving parts.
(3) The basic condition of the filter temperature condition is the same as that of the infusion tube, but it has a prominent abnormal phenomenon, that is, the filter may be cold, because the filter mesh is blocked by the sludge, so that the filter is not smooth, when When the refrigerant flows through the filter, a throttling phenomenon occurs, that is, a part of the liquid vaporizes and absorbs heat, causing the filter to cool and causing serious condensation. Another abnormal phenomenon is that the filter is not hot and is equivalent to the ambient temperature. The reason is that the filter is completely blocked and the refrigerant cannot flow.
(4) Temperature condition of the reservoir Under normal conditions, the suction tube feels cool by hand and is exposed to dew. The reason is that the condenser has poor heat dissipation, high condensation temperature or excessive refrigerant charge.
(5) Liquid tube temperature condition Under normal conditions, the liquid tube is warm. Under abnormal conditions, the liquid tube is hot. The reason is that the condenser has poor heat dissipation, high condensation temperature or excessive refrigerant flow.
(6) Influence of exhaust temperature In the summer, the exhaust temperature of the compressor is relatively high and the hand cannot be touched. According to national standards, the exhaust temperature of the R22 refrigeration system should not exceed 150 °C. Exceeding this temperature line is an abnormal condition. The reason why the exhaust gas temperature is too high is that the suction temperature of the compressor is extremely high, or the condensing temperature is too high, and attention must be paid. Exhaust gas temperature is too low, the hand touches the exhaust pipe is not hot, which indicates that the inhalation temperature is extremely low, the compressor may be wet running or the system working condition is relatively small. The wet stroke of the compressor easily damages the valve structure; the operation of the refrigerant is extremely small, which will affect the heat dissipation of the winding of the motor and accelerate the aging of the insulating material.
(7) Temperature condition of the suction pipe Under normal conditions, the suction pipe feels cool by hand and has dew. Under abnormal conditions, first, the suction pipe is cold and the dew is too much, so that the casing is exposed to a large area. The reason is that the refrigerant flow rate is too large, the liquid cannot be completely vaporized in the evaporator, and there is a liquid reflux phenomenon. The hazard is that the compressor may run on a wet stroke. In severe cases, a liquid blow will occur and the valve piece will be threatened. Second, the suction pipe is not cool, does not condense, and the casing is very hot. The reason is that the refrigerant flow rate is too small or the refrigerant amount is insufficient. The consequence is that the exhaust gas temperature rises and the cooling capacity decreases.
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Label: Performance Benefits of Refrigeration System from Compressive Condensing Unit Temperature Change
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