Trial Operation and Commissioning of Refrigeration Units in Clean Workshop
Trial Operation and Commissioning of Refrigeration Units in pharmaceutical cleanroom
Before commissioning the refrigeration unit, conduct a test run to check whether the solenoid valve is open or not. You can use a hand mold solenoid valve coil shell. If you feel heat and slight vibration, it means that the valve has been opened; pay attention to the temperature of the lubricating oil, generally it should not be More than 60℃, because the oil...
Text label: Refrigeration plant in , commissioning and commissioning
Trial operation and commissioning of the refrigeration unit in the
Before commissioning the refrigeration unit, conduct a test run to check whether the solenoid valve is open or not. You can use a hand mold solenoid valve coil shell. If you feel heat and slight vibration, it means that the valve has been opened; pay attention to the temperature of the lubricating oil, generally it should not be Above 60℃, because the oil temperature is too high, it will reduce the viscosity of the lubricating oil and affect the lubricating effect, but the oil temperature should not be too low. Pressure and exhaust temperature, according to the regulations, the exhaust pressure R12 cannot exceed 1.18MPa, R22 and R717 cannot exceed 1.67MPa, the exhaust temperature R12 cannot exceed 130℃, R22 and R717 cannot exceed 150℃, and cannot exceed 100℃ for the old series products ; Excessive exhaust temperature will cause carbonization of the lubricating oil, shorten the life of the valve plate, and accelerate the wear of the cylinder and piston. For the test of the high-voltage relay, open the suction valve fully, close the cooling water valve of the condenser, and gradually increase the exhaust pressure to see if the exhaust pressure value when the high-voltage relay operates is consistent with the required pressure value. If it meets the requirements, it should be adjusted until it meets the requirements; for a compressor equipped with an energy regulating device, check whether the structure operates normally; check the pipelines and valves of the entire system for leakage treatment. You can start to debug the work of the refrigeration unit.
The commissioning of the refrigeration device is to adjust the operating parameters of the device to the required range, so that the work of the refrigeration device can meet the design requirements, and the operating parameters of the device work within a safe and economical range; The evaporating temperature should be determined according to the temperature requirements of the cooled medium and its working characteristics. For the direct evaporative cold storage, when the air is in natural convection, the evaporating temperature is 10-15 °C lower than the required cold storage temperature; when the air is forced to circulate, The evaporation temperature is 5-10°C lower than the temperature of the cold storage. For the evaporator of cooling liquid, its evaporation temperature should be 4-6°C lower than the average temperature of the cooled liquid. During the operation of the refrigeration device, the evaporating temperature is not fixed, and will change accordingly with the change of the working conditions; in the case of inconvenient condensing pressure, the refrigeration capacity of the device will increase with the decrease of the evaporating temperature. However, the power consumption per unit cooling capacity increases as the evaporating temperature decreases. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean workshops and purification workshops.
The suction temperature of the compressor is the temperature of the refrigerant at the suction valve. In order to ensure the safe operation of the compressor and prevent the phenomenon of liquid shock to the cylinder, the suction temperature is a little higher than the evaporation temperature, that is, the refrigerant gas becomes The superheated gas has a certain degree of superheat; in a Freon refrigeration device without a gas-liquid subcooler, it is appropriate that the suction temperature should be about 5 °C higher than the evaporation temperature; when there is a gas-liquid superheater, keep the suction temperature of 15 °C The gas heat is suitable. For ammonia refrigeration units, the suction superheat is generally 5-10°C. It should be avoided that the suction superheat is too large or too small. If the superheat is too large, the cooling capacity will decrease, the exhaust temperature will increase, and the power consumption will increase. . The discharge temperature of the compressor is the cooling temperature at the discharge valve. In order to ensure the safe operation of the compressor, it is stipulated that the discharge temperature of the R12 device should not exceed 130 °C, and the ammonia device of R22 should not exceed 150 °C. The exhaust temperature is too high. , it will cause the viscosity of the lubricating oil to decrease due to the increase in temperature, making the lubrication effect worse, and easily causing damage to the running parts.
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