Technical requirements for variable air volume air conditioning systems?
Technical requirements for variable air volume air conditioning systems?
The bottom of the VAV air-conditioning system chassis should be provided with a manhole plate that can inspect the air valve and fan and other components, and it should be closed without leakage, so as to ensure that the fan motor can be removed even under non-fault conditions without affecting the air duct. Connection, the air inlet of the chassis is circular, and the air outlet is rectangular...
Text Label: Variable Air Volume Air Conditioning System Requirements, Design, Installation and Transformation of pharmaceutical cleanroom
Technical requirements for variable air volume air conditioning systems?
The bottom of the VAV air-conditioning system chassis should be provided with a manhole plate that can inspect the air valve and fan and other components, and it should be closed without leakage, so as to ensure that the fan motor can be removed even under non-fault conditions without affecting the air duct. Connection, the air inlet of the chassis is circular, and the air outlet is rectangular or circular, all of which need to be connected by standard flanges; the shell material of the box is made of high-quality galvanized steel, the thickness of the steel plate should not be less than 1mm, and the box should have sufficient strength and The rigidity can meet the routine installation work and operation. The inner lining material is glass fiber surface covered with silk reinforced aluminum foil protective surface layer to prevent glass fiber from scattering and can prevent moisture and moisture, or use environmentally friendly non-glass fiber insulation materials; variable air volume end The connection between the shells is tight. Under the static pressure of 750Pa, the leakage air volume of the unit is less than or equal to 1% of the rated air supply volume, and the resistance under the rated air volume must not exceed 40Pa; the spring shock absorber and installation hook for box installation are provided as a set ; The air volume sensor is made of non-combustible PVC material or aluminum material. The sensor must be a cross-shaped multi-point average flow rate type. The sampling hole takes multi-point and multi-position sampling according to the size of the cross-section, and then takes the average value to ensure that it can also be measured under unfavorable conditions. Accurate value, the accuracy must ensure that the air volume fluctuation of the terminal device is within the range of ±5%; the static pressure measuring point is arranged on the side of the sensor to avoid the blockage of the measuring hole caused by the eddy current area on the back side, and the structure of the air volume sensor should be firm to avoid construction. Damage caused by construction workers carrying the sensor.
The air valve requires low noise, low resistance loss and good airtight performance; when the air valve is fully closed, when the inlet static pressure is 1000Pa, the air leakage of the air valve is less than or equal to 1% of the rated maximum air intake; The boxes are connected by a valve shaft with a self-lubricating seal. The valve shaft is made of stainless steel. The shaft end is provided with a valve position indicating device. The end of the air valve shaft located in the control box has an irremovable valve position indicating mark. Adhesive or other removable indicator signs are used, and a mechanical valve position limiting device is installed on the air valve to prevent the air valve from over-running; the air valve actuator should be installed on the outside of the unit for easy dust prevention, safety and maintenance. inside the box. The variable air volume air supply terminal device needs to provide a set of direct digital controller with air volume compensation pressure difference conversion, and add electric primary air valve actuator and 24V transformer. The actuator and controller use integrated cooling and heating type special equipment; The temperature signal of the room temperature controller and the flow feedback signal of the air volume sensor drive the actuator to change the opening of the valve plate, so that it can continuously adjust the primary air supply air volume within the range of 25%-100%. And the actuator shall be provided, installed and debugged by the VAV terminal manufacturer; the transformer shall have its own current limiting and protective isolation switch; the controller shall have sufficient output and input signals for system use; the variation range of the controller is 0-100% Continuous proportional integral adjustment, the nominal 90° full rotation time of the controller is less than or equal to 90S; the indoor temperature controller needs to be electronic with liquid crystal display. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean workshops and purification plants.
The fan is a centrifugal fan, the impeller is a forward-inclined impeller, the fan impeller and the casing are made of galvanized steel plate, the fan motor is a direct drive type, which is elastically installed and fixed by a positioning frame, and the input potential is 220-230V, 50Hz Single-phase alternating current; it is required to be equipped with an automatic reset thermal overload overload device. The fan motor is a three-connector, three-coil, fixed-separation real capacitor type and is equipped with self-lubricating bearings. All grounding and original configuration must meet the standard requirements; equipped with four connectors Power transformer, the combination of the transformer and the three sets of coils of the fan can provide a wider range of fan speed regulation, ensure the stable operation of the motor, and can accurately adjust the air volume of the unit and the static pressure at the outlet of the unit to achieve the best working conditions; Fans should be equipped with vibration isolation and vibration damping devices. The noise index of the variable air volume terminal equipment should meet the design requirements. The noise should include the superposition of all noise sources such as equipment vibration noise and radiated noise of the casing. Under the given design air volume conditions, the maximum noise value of the terminal equipment is not greater than 35dB. Bidders shall provide detailed noise performance data and terminal selection data including noise indicators when bidding.
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