Use of Air Ducts in Workshops

Application of Bag Air Duct in High Temperature Workshop

The insulating bag air duct is a type of air conveying and distributing system made from fiber materials. This system integrates the static pressure box, thermal insulation material, ventilation duct, air outlets, and air valves into a multifunctional whole, leveraging the gaps within the fibers. Various forms of nozzles or slotted air supply holes ensure uniform and flexible airflow to the designated air regions. The waterfall-insulated cloth bag air duct features uniform airflow, high air volume, no draft sensation, anti-condensation, ease of cleaning and maintenance, healthiness, and environmental friendliness.

The insulated cloth air duct adopts an air outlet mode with displacement ventilation effects, delivering fresh air after heat and moisture treatment directly into the indoor personnel activity area. The fresh air flows downward with convective air, forming the dominant airflow of indoor air movement. The air outlets are positioned at the lower part of the workshop to remove polluted air, adhering to the "supply from above and exhaust from below" air distribution mode.

The characteristic of the workshop is that pollutants accompany the heat source, the space is large, and the heat load is not excessively high. Unlike the traditional mixed ventilation principle of dilution and mixing, displacement ventilation involves sending fresh air with lower wind speed into the personnel working area. By utilizing the principle of displacement, this ventilation method pushes polluted air into an upper or lower space before expelling it.

Displacement ventilation offers advantages in ventilation efficiency, indoor air quality, and energy savings, presenting significant energy-saving potential. However, designing displacement ventilation is challenging due to its reliance on various factors such as temperature distribution, concentration distribution, wind velocity distribution, and airflow distribution. This paper delves into the principles of displacement ventilation, summarizes its design methods, and highlights the use of advanced airflow simulation software and airflow simulation laboratories to support the design process, ensuring effective control over the temperature, humidity of the work area, and pollutant concentrations.

The insulated Fabric Air Duct represents a novel ventilation approach, increasingly adopted in workshops. Application results indicate a marked improvement in workshop air quality and the ability to address issues related to uniform cooling within the workshop.