Laboratory ventilation control system engineering

ventilation control system engineering

ventilation control system can adopt different control methods according to different situations, such as single ventilation equipment constant air volume ventilation control system, multiple ventilation equipment variable frequency ventilation control system, multiple through equipment frequency conversion + variable air volume ventilation control system . A single ventilation equipment constant air volume...

Text label: pharma machinery ventilation system, laboratory engineering installation

ventilation control system engineering

ventilation control system can adopt different control methods according to different situations, such as single ventilation equipment constant air volume ventilation control system, multiple ventilation equipment variable frequency ventilation control system, multiple through equipment frequency conversion + variable air volume ventilation control system . The constant air volume ventilation control system of a single ventilation device is simple to operate. The switch of the system does not affect other equipment in the same room, and only the required ventilation equipment is used; it prevents the series connection of the ventilation system and the backflow of the exhaust gas; it is easy to control the air flow; the system operation cost is low; The disadvantage is that the initial investment of the system is high; the installation is complicated and the installation space is required; the long-term maintenance cost is expensive; it is suitable for special functional laboratories such as P2 laboratory, P3 laboratory, sterile room, radioactive laboratory, PCR laboratory, animal experiments laboratory, DNA pharma machinery, etc.

Constant air volume ventilation control system with multiple ventilation equipment is a series of ventilation equipment or multiple ventilation equipment through a series of pipes to exhaust air by a fan. The control valve above the cabinet is an electric valve. There are two control methods: Fixed-point control and multi-point control. Fixed-point control of all ventilation equipment only uses one switch to start or close at the same time; multi-point control installs switches in multiple ventilation equipment or laboratories, as long as one of the switches is still in the start-up stage, the fan will still be in the running state, only All switches are disconnected, the fan will stop, and the entire ventilation system will stop shutting down. The advantages are to reduce the operation of materials and reduce the initial investment; simplify the installation of the ventilation system and reduce the demand for installation space; the maintenance cost is relatively reduced; the multi-point control can achieve the human-oriented laboratory concept, which is convenient for the operator to switch the required equipment according to the situation. . The disadvantage is that it belongs to constant air volume exhaust, which requires 100% exhaust air. The larger the system, the more energy will be wasted; the pipeline operation volume is large, the noise is large, the air volume is not easy to balance, and the exhaust air volume is insufficient; Unable to control freely and discharge according to the actual required amount. It is suitable for physical and chemical laboratories, preparation rooms, and deployment rooms with low requirements. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for laboratories and clean rooms.

The frequency conversion ventilation control system of multiple ventilation equipment is a fan shared by multiple ventilation equipments. It adopts the frequency conversion control technology to automatically adjust the operation of the fan according to the usage of the ventilation equipment, so as to achieve the purpose of energy saving; on the main pipe of the ventilation pipeline Add the air duct pressure sensor, set up a frequency conversion cabinet, and install a frequency conversion controller in the frequency conversion cabinet. By initially setting an air duct pressure value, the frequency conversion control cabinet controls the system air volume; frequency conversion speed regulation is an advanced and mature technology. The rectifier, inverter and control circuit convert alternating current with a certain frequency into direct current, and then invert the direct current into alternating current with different frequencies, so as to achieve speed control of the AC asynchronous motor. For the ventilation system, PLC frequency conversion control is used to directly adjust the air volume, so as to reduce the useless power and improve the working efficiency of the system; after frequency conversion, the fan generally runs at 30-45Hz, and the energy saving is more than 25%-70%. The lower the frequency, the higher the power saving rate. High; realize variable frequency soft start, reduce the impact of motor start on the power grid and the damage to the motor itself, improve the life of the motor and the life of the system; adopt variable frequency speed regulation, adjust the frequency in real time with the air volume to adjust the speed, and the operating quality of the fan is greatly improved improve. Since the frequency conversion system is connected with multiple ventilation devices, the ventilation system has requirements on the height of the room and the size of the pipe well. Only the room with a high height is suitable for the frequency conversion system, because the size of the air duct of the frequency conversion system is large. It is suitable for a lot of ventilation equipment in the same room or multiple rooms used at the same time. It is advisable to use a frequency conversion system, which can effectively save energy.

In order to solve the requirements of variable air volume at the end of the ventilation equipment and the requirement of constant surface wind speed, and achieve further energy saving, a variable frequency + variable air volume ventilation control system has appeared. The system includes wind speed sensors, infrared detectors, air volume control valves, and automatic controller panels. and operating terminal. Frequency conversion speed regulation is adopted to directly adjust the air volume, so as to reduce the useless power and improve the working efficiency of the system; adding a sensor at the end of the variable air volume to control the frequency converter is much higher than that of using the frequency conversion system alone to control the frequency converter with a pressure sensor in the main pipe. Frequency conversion speed regulation The rear fan generally runs at 30-45Hz, which saves energy by more than 50%-70%. The lower the frequency, the more energy-saving it is; the frequency is adjusted in real time with the air volume to adjust the speed, and the operating quality of the fan is greatly improved; the frequency conversion system is a multi-unit ventilation device. Connected together, the ventilation system has requirements on the height of the room and the size of the tube well. Only the room with sufficient height is suitable for the variable frequency + variable air volume system. It is suitable for the same room or for multiple rooms at the same time. There are many ventilation devices. It is advisable to use the variable frequency + variable air volume system, which has the best control effect and the most energy saving.

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