Introduction to the inhalation temperature and pressure of the chiller
Compressor suction temperature (pressure) and exhaust gas temperature (pressure) The suction temperature depends on the evaporating temperature, the length of the return pipe, the insulation of the pipe, and the outside air temperature. In theory, the compressor is better when it draws in saturated gas. However, in order to ensure the safe operation of the compressor, to prevent liquid blows, and to make the insulation layer of the return air pipe inexpensive, the intake air temperature is allowed to be slightly overheated. Generally, the inhalation temperature is 5 to 15 ° C higher than the evaporation temperature. The suction temperature of the compressor is one of the signs to check the operation of the evaporator and the insulation of the return line. The evaporation temperature is constant, and the suction temperature is too high, indicating that the return air is overheated, which will increase the specific volume of the refrigerant vapor, reduce the displacement of the compressor, reduce the cooling capacity, and increase the exhaust gas temperature. The reasons for the high suction temperature are: the expansion valve is too small, the circulation of the refrigerant in the system is insufficient, and the performance of the insulation of the return air pipe is not good or damaged. The suction temperature of the compressor is too low, which is caused by poor gasification of the refrigerant, and is also a precursor to the wet stroke and should be avoided as much as possible. The exhaust temperature depends on the evaporation pressure of the refrigerant and the dryness of the suction gas. It is one of the indicators for the correct adjustment of the parameters of the refrigeration system. The temperature of the exhaust gas is proportional to the compression ratio and the suction temperature. The larger the compression ratio is. The higher the degree of superheat during inhalation, the higher the exhaust gas temperature, that is, the increase in condensing pressure due to various reasons, the evaporating pressure is reduced, the superheat of suction is too large, and the compressor itself (such as cooling water) The shortage of water and water, the venting valve or the safety bypass valve and the leakage of the starting auxiliary valve can cause the compressor exhaust temperature to be too high. In actual operation, the compressor exhaust temperature should not exceed 145 °C. Inspiratory pressure, inspiratory temperature and exhaust pressure, exhaust temperature are related to each other, but not one-to-one correspondence. In practical applications, due to the exhaust pressure and the condensing pressure, the suction pressure and the evaporation pressure are relatively close. Without considering the loss of the pipeline resistance, the suction pressure of the compressor is the evaporation pressure, and the exhaust of the compressor. The pressure is the condensing pressure. If it is considered to overcome the resistance loss during suction and exhaust, the evaporation pressure is always higher than the suction pressure, and the discharge pressure is always higher than the condensation pressure. However, the inhalation temperature and the exhaust gas temperature have a large change, but it is not a corresponding relationship. Generally, the inhalation temperature is 5 to 15 ° C higher than the evaporation temperature, and the exhaust gas temperature greatly exceeds the condensation temperature.