Pressure loss of bag air duct in uniform air supply

Bag air duct, also known as fabric fiber duct or bag-type air duct, is a type of air supply terminal device made of special fabric that integrates air transmission and distribution. Fresh air passes through fiber pores or openings. Diffused from the inside of the cavity to the room. Compared with the conventional air supply system, the bagged air duct has the characteristics of easy cleaning, large air outlet area, light weight, simple construction and short cycle. At the same time, it can also solve the problems of cold air feeling and surface condensation that are easy to appear in low-temperature air-conditioning systems. The 'self-rectifying' effect of the permeable bagged air duct on the air is basically independent of the air supply volume, but the surface air velocity increases with the air supply volume, and the relationship between the two is approximately linear. With the increase of air supply, the total air pressure and static pressure in the cavity of the flexible duct permeable bag duct gradually increase, and the gradient of static pressure increase and dynamic pressure attenuation gradient becomes larger and larger, and the static pressure at the end is restored. The more obvious. There are three factors that affect the pressure in the bag duct: dynamic pressure, static pressure and pressure loss. The dynamic pressure is transformed into static pressure along the length direction in the bag duct, also known as static pressure recovery. The pressure loss along the way and the local resistance loss caused by the connecting piece are referred to as pressure loss for short. Therefore, the average static pressure in the pipe can be considered to be composed of inlet static pressure, static pressure recovery and pressure loss. Since the pressure loss is proportional to the wind speed, when the wind speed along the length of the pipeline becomes smaller and smaller, the resistance loss also decreases. At the same time, there is a local resistance loss in the standard parts of the air duct and the air outlet. In the bagged air duct, the fiber cloth air duct straight pipe is the main component, and the tee, elbow and reducer are less in the system, and the resistance loss along the way is the main component. The inlet static pressure is generally provided by a fan. Generally speaking, the inlet static pressure should be ≥125Pa, generally not more than 700Pa. The frictional resistance coefficient is an indefinite value, which is related to the flow state of the air in the duct and the roughness of the duct wall. The pressure calculated in the air distribution pipe can be used to overcome the resistance loss and local loss along the way and achieve the ideal airflow distribution. The resistance loss is usually negligible. Theoretically, the air distribution pipe can be regarded as a static pressure box, but the static pressure in the pipe cannot be consistent. There is no change in the dynamic pressure at the inlet, and its static pressure is the inlet static pressure. The dynamic pressure is gradually transformed into static pressure along the length of the pipe, and the static pressure reaches the maximum value at the end. Its value is the vector sum of the inlet static pressure, the static pressure of the fiber bag duct and the resistance loss. End static pressure u003d inlet static pressure + static pressure recovery-pressure loss The average pressure in the pipe is the average of the inlet static pressure and the end static pressure. To sum up, when the air is uniformly transmitted in the bag duct, the air flow of the fabric duct is continuously reduced along the entire system, and the pressure loss gradually decreases with the decrease of wind speed, thereby significantly reducing the actual total amount caused by friction. Pressure loss, so in most cases, the pressure loss in the fiber duct is less than 1/10. When there is a local resistance loss, such as near the elbow, the outlet of the air distribution pipe fittings and the main supply pipe, and the long straight pipe (greater than 30m), the pressure loss cannot be ignored.

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