Air Volume Measurement of Air Conditioning System in Clean Room
Air Volume Measurement of Air Conditioning System in Clean Room
After the installation of the ventilation system in the clean room, trial operation and debugging should be carried out. The fundamental task of system adjustment is to adjust the air volume of each pipe section of the system to the design air volume, so that the operation of the system and equipment can meet the predetermined design requirements; the ventilation system The test operation of the equipment is mainly for the fan...
Text label: Design and installation of clean room, construction of clean room, measurement of air volume of air conditioning system
Determination of air volume of air conditioning system in clean room
After the installation of the ventilation system in the clean room, trial operation and debugging should be carried out. The fundamental task of system adjustment is to adjust the air volume of each pipe section of the system to the design air volume, so that the operation of the system and equipment can meet the predetermined design requirements; the ventilation system The test operation of the equipment is mainly for the test operation of fans, including supply and exhaust fans, air conditioner fans, etc.; check whether the models, specifications, pulley diameters, belts, etc. of fans and motors are consistent with the parameters provided by the design or equipment supplier; check Check whether the center of the two pulleys of the fan and the motor is in a straight line or whether the coupling is concentric, and whether the tightness of the transmission belt is appropriate; check whether the flexible connections at the inlet and outlet of the fan are tight and whether the tightness is suitable; the fan is manually turned, and the impeller should be free of The inside and outside of the fan should be clean and free of dust accumulation; the grounding of the motor, fan, and air duct should be reliable, the fan regulating valve should be flexible, and the positioning device should be reliable; No air leakage.
The air volume control valve or fire control valve on the main pipe, branch main pipe and branch pipe is fully open; the fresh air and return air electric split multi-leaf control valve of the combined air conditioner must meet the requirements of electric switch; Insulation is complete, and the exhaust air duct should be well sealed. The rotation direction of the fan should be consistent with the direction indicated by the arrow on the casing. After confirming that it is correct, the test run can be carried out. When starting, the clamp current should be used to measure the starting current of the motor. After the fan is running normally, the running current of the motor should be measured. If the rated current of the motor exceeds the rated current of the motor, the fire control valve of the total air volume should be gradually closed until the rated current is reached; if abnormal phenomena are found during the operation of the fan, it should be stopped immediately for inspection, and the fault should be eliminated before running. less than 2H. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean rooms and clean rooms.
The air volume measurement of the air-conditioning system includes: measuring the total air supply volume of each air-conditioning unit, the total exhaust air volume of each exhaust air and smoke exhaust unit, the air volume of each new air outlet, air supply outlet and air outlet; air volume of the air conditioning system The measurement and adjustment should be carried out after the fan is running normally and the faults in the ventilation pipe network have been eliminated; the measurement section should generally be considered to be set on the straight pipe section with uniform and stable airflow, away from the elbows, tees and other parts that generate eddy currents There is a certain distance between the components. Generally, according to the direction of the airflow, the measurement section is selected on the straight pipe section of 4-5 times the pipe diameter after the partial component and 1.5-2 times the pipe diameter before the partial component. When limited by conditions, this distance can be appropriate. It should be shortened, but the measurement position should be increased, or a variety of methods should be used for comparison, and the measurement results should be accurate. The system air volume measurement is generally divided into two steps. The first step is to measure and adjust the total air supply volume of the air conditioner. The second step is to balance the air volume of each air outlet, that is, to distribute the air supply volume of the blower equally to each air outlet. The wind speed of each point on the measuring section is not equal, so generally it is not possible to represent the entire section with the value of only one point. The position and number of measuring points on the measuring section mainly depend on the shape and size of the section. Obviously, the more measuring points, the more The measured average wind speed value is closer to the actual value, but there should not be too many measuring points. Generally, the equal area distribution method is adopted; the layout of the measuring points of the rectangular air duct is generally required to be divided into small squares close to the square as much as possible, and the area is not more than 0.05m2. The point is located in the center of the small square; the circular duct measuring point arrangement should divide the measuring point section into several concentric rings of equal area, and the measuring points should be located on the bisector of the area of u200bu200beach ring, and should be on two perpendicular to each other. 2 or 4 measuring holes are arranged on the diameter. For grille tuyere and diffuser, the method of adding short pipe outside the tuyere can be used to measure the air volume. The length of the short pipe is equal to 0.7-3 times the length or diameter of the large side of the tuyere, and the section size of the short pipe is equal to the section size of the tuyere. For the louver tuyere with a regulating valve, since the regulating valve has a great influence on the airflow, the measurement method of adding a short pipe can also be used.
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