Design and Control of VAV Air Conditioning System in Purification Engineering
Design and Control of VAV Air Conditioning System in Purification Engineering
VAV tuyere is easy to use and has flexible adjustment methods, realizes variable air volume end adjustment, saves energy, and requires less maintenance; the model of variable air volume tuyere should be determined according to the design maximum air volume of the air-conditioned room in the application environment, and the variable air volume tuyere should be arranged. When reaching the wall...
Text label: purification engineering variable air volume air conditioning system, design control, clean engineering installation
Design and Control of VAV Air Conditioning System in Purification Engineering
VAV tuyere is easy to use and has flexible adjustment methods, realizes variable air volume end adjustment, saves energy, and requires less maintenance; the model of variable air volume tuyere should be determined according to the design maximum air volume of the air-conditioned room in the application environment, and the variable air volume tuyere should be arranged. When reaching the wall, the airflow speed should be controlled at 0.25-0.5m/s, and the maximum should not exceed 0.76m/s. When there are multiple variable air volume vents in the air-conditioned room, the distance between the vents should not be less than 0.76m/s when the airflow range The ideal spacing is between twice the range at 0.25m/s and twice the range at 0.5m/s; the models that determine the variable air volume include hot and cold type, single-cold belt rapid heating The selection of cooling type and single cooling type; in different working modes, the temperature control process is different, such as the temperature change range adjustment in cooling mode and heating mode, there are different ranges when using different variable air volume tuyere ends; Set the temperature sensor in the most loaded room or the most important room to automatically control the conversion of the cooling and heating mode of the system.
Variable air volume vents are used in low-pressure air-conditioning systems, and the static pressure at the inlet of the vents generally does not exceed 127Pa. This type of air vents can be used in constant-air volume air-conditioning systems, and can also be used in static pressure-controlled decompression and bypass variable In the air volume air conditioning system, the performance of the variable air volume outlet is related to the static pressure of the air supply inlet and the size of the outlet; a good duct design requires low operating noise, low pressure drop, and energy saving. The principle and structure of the variable air volume outlet determine the static pressure at the air duct inlet. Restricted, it is suitable for low-pressure air duct system; the static pressure design of low-pressure air supply duct is based on the noise standard to determine the maximum value of the first inlet static pressure, and is designed according to the last variable air volume outlet. The methods of realizing static pressure control include: pressure relief ring control, ventilation valve control, fan air supply duct air valve control, fan control, air supply temperature control, and system working mode control; in large systems, in order to ensure that the The variable air volume tuyere above can work effectively, and it is necessary to set a regional adjustment air valve on each air supply branch pipe. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for purification projects and cleaning projects.
The wind speed sensor is a key component in the variable air volume terminal device. The type and performance directly affect the detection and control quality of the system air volume. The wind speed sensor is generally developed by each terminal device manufacturer or commissioned by the control pharma machinery manufacturer. The wind speed sensor in the terminal device can understand the flow law of the air flow, and can also calculate the air supply flow through the variable air volume terminal device, so as to effectively control the air supply volume of each terminal device and even the entire air conditioning system; it can be used A variety of different wind speed measurements, when using different wind speed measurement sensors, have different wind speed detection ranges and different accuracy requirements. According to the application environment and user needs, the wind speed sensor is selected according to the detection range and accuracy requirements. When using a pitot tube as a flow rate sensor, the flow rate of the fluid to be measured should not be too small. Generally, the Reynolds number at the full pressure measuring hole is required to be greater than 200; The ratio of the diameter of the measuring pipe is 0.04-0.09; the relative roughness of the measuring pipe should not be greater than 0.01; during the measurement, it should be ensured that the full pressure measuring hole faces the flow direction of the fluid, and its axis is consistent with the flow direction of the fluid.
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