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In view of the above interference factors, the dust prevention workshop of Dongguan should consider the stability of the differential pressure control from many aspects such as design, installation, commissioning, and operation. The control methods in practical applications are discussed below.
1. The return air volume of the circulation unit should meet the requirements, and can be automatically adjusted to ensure a fixed value air supply, that is, the design total air volume needs a margin for adjustment. When the air volume decreases during use, the air filter resistance can still be adjusted to the required The air volume and the set value of the supply air can be determined on the basis of the static pressure difference test balance during the debugging process.
2. The constant value adjustment of the pressure difference of the dust-proof workshop in Dongguan is based on the balance of the air volume test, that is, when the static air condition is satisfied, and the opening of the self-controlled air return valve is set higher than 50%, It is possible to adjust the air return hand valve to make the indoor pressure difference close to a given value. When there are a large number of rooms controlled by a unit, special attention must be paid to the commissioning. Due to the mutual influence of the branch air volume, this commissioning step is an iterative process. The process of gradually approaching the set value. When all the rooms have met the requirements after testing, they can be fixedly sent back to the hand valve, and then put into the differential pressure automatic control system.
3.Dustproof workshop in Dongguan avoids the eddy current caused by improper design of the air duct, which makes the static pressure difference detected in an unstable state, and the system cannot give an accurate adjustment signal. The air duct fire valve should be installed in an easy maintenance position to ensure the fire valve. When the state change affects the wind pressure, it can be adjusted in time, which is an issue that is easy to ignore in the design.
The air-conditioning unit of the Dongguan dust-proof workshop is equipped with an electric two-way regulating valve on the return pipe, which adjusts the amount of water supply according to the set return air temperature. In order to use the new wind operation during the transition season, when the outdoor temperature is lower than 24 degrees in the transition season, the amount of fresh air is gradually increased. When the outdoor fresh air is less than 2 degrees, the fresh air is increased by 20%. Adjust accordingly, when the outdoor temperature is lower than 16 degrees, fresh air will run.