In the above, we talked about two major reasons for the overheating of the exhaust temperature of the high and low temperature test chamber refrigeration compressors: high return air temperature and large motor heating; now we will talk about the remaining three reasons: high compression ratio, condensation High pressure and improper choice of refrigerant.
(3) Compressed temperature rise and refrigerant type
Different refrigerants have different thermophysical properties, and the exhaust gas temperature rises differently after undergoing the same compression process. Therefore, different refrigerants should be used for different cooling temperatures.
(4) Motor heating
For a return air-cooled compressor, the refrigerant vapor is heated by the motor as it flows through the motor cavity, and the cylinder suction temperature is again increased. The heat generated by the motor is affected by power and efficiency, and the power consumption is closely related to displacement, volumetric efficiency, working conditions, and frictional resistance.
In the return air-cooled half-sealed compressor, the temperature rise of the refrigerant in the motor cavity is approximately between 15 and 45 °C. In the air-cooled (air-cooled) type compressor, the cooling system does not pass through the winding, so there is no motor heating problem.
(5) Anti-expansion and gas mixing
After the start of the suction stroke, the high pressure gas remaining in the cylinder clearance will have an inverse expansion process. After the reverse expansion, the gas pressure is restored to the suction pressure, and the energy consumed for compressing this part of the gas is lost in the reverse expansion. The smaller the clearance, the smaller the power consumption caused by the reverse expansion on the one hand, and the larger the amount of inhalation on the other hand, the greater the energy efficiency ratio of the compressor.
During the anti-expansion process, the gas contacts the high temperature surface of the valve plate, the top of the piston and the top of the cylinder to absorb heat, so that the gas temperature does not decrease to the suction temperature at the end of the reverse expansion. After the end of the anti-expansion, the real inhalation process begins. After the gas enters the cylinder, on the one hand, it mixes with the anti-expansion gas, and the temperature rises; on the other hand, the mixed gas absorbs heat from the wall to heat up. Therefore, the gas temperature at the beginning of the compression process of the high and low temperature test chamber is higher than the suction temperature. However, since the anti-expansion process and the inhalation process are very short, the actual temperature rise is very limited, generally less than 5 °C. The reverse expansion is caused by the cylinder clearance and is a disadvantage that the conventional piston compressor cannot avoid. If the gas in the vent hole of the valve plate is not discharged, there will be reverse expansion.
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