Optimized design of special duct system for central air-conditioning

1. In order to reduce the local loss of the bagged air duct system, we usually carry out a certain optimization design: 1. Combining a variety of factors to select the pipe length, try to reduce the wind speed in the bagged air duct system. 2. Optimize the design of special-shaped parts to avoid rapid changes in flow direction and rapid cross-section changes. 3. The main point of calculating the piping system of the bagged air duct system is to first select the loop that is the least necessary for the system. 4. Generally refers to the branch pipeline with the longest or most partial components (such as tees, elbows, etc.). 5. Secondly, calculate the cross-sectional size of each duct section (referring to the loop) according to the air volume and the selected wind speed, and calculate the resistance of each pipe section and the total resistance of the system according to the size, and select according to the total resistance Fan. 6. Finally, according to the principle of system resistance balance, determine the diameter of the remaining branch pipelines. The total resistance difference between the loops is required to be no more than 15%. If the branch pipeline diameter cannot be determined to meet the resistance balance requirements, then Use the PAD control valve to adjust. 2. When the bagged air duct system is mainly straight pipes, generally the resistance loss along the way is the main reason. The friction resistance along the way when the air cross-section shape is constant in the pipeline is calculated as follows: Friction resistance coefficient; in the duct The average flow velocity of air, m/s; the density of air, kg/m3; the length of the air duct, m; the diameter (inner diameter) of the circular air duct, m; The flow state is related to the roughness of the duct wall. According to the comprehensive research on the fiber material and the bag duct system, the friction resistance coefficient is not more than 0.024 (the iron sheet duct is about 0.019), due to the duct extension direction of the bag duct system There are air supply holes on the top, and the average wind speed in the bagged duct is 1/2 of the inlet speed of the duct. It can be seen that the extension loss of the air duct of the bagged air duct system is much smaller than that of the traditional iron sheet air duct. The bag duct system, especially the straight duct system, has a very small resistance loss along the way, and generally does not exceed the value obtained by the static pressure, so it can be basically ignored in the rough calculation! With the in-depth study of the air supply principle of the bag air duct system, the company's scientific research personnel have gradually matured the design method of the bag air duct system, including the research and calculation of the internal resistance of the bag air duct. The bagged air duct system has a certain loss of pressure due to frictional resistance and local resistance along the length of the pipe. Because the pressure loss is directly proportional to the wind speed, when the wind speed along the length of the pipe becomes smaller and smaller, the resistance loss also decreases. At the same time, the standard parts of the bag air duct system and the air outlet also have local resistance losses.

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