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In the field of clean engineering, the selection of ventilation ducts in Shandong is of critical importance. The cleanliness and airtightness of the duct system are essential, as the wind pressure within the ducts of a clean air conditioning system is significantly higher—often double that of standard systems. This makes it even more crucial to pay close attention to the design and construction of these ducts.
The development of China's purification air-conditioning industry began in the mid-1970s, marking a new era for many. At that time, the concept of clean air conditioning was still unfamiliar to most people, but it quickly gained attention due to its importance in maintaining air quality. In engineering applications, the focus on ventilation ducts was high, with strict requirements for their cleanliness and airtightness. These factors directly impact the performance of the entire purification system, including airflow organization, air volume, pressure, energy consumption, and noise levels.
Back then, material options were limited, and steel-zinc plates were commonly used for ventilation ducts in Shandong, which was more advanced than the black steel plates typically used in other areas. Workers at the time showed great enthusiasm and responsibility, resulting in high-quality craftsmanship. Their work ensured good airtightness at joints and flanges, and the protective layers were well-maintained. Many of those early ducts are still in use today, made from steel-zinc plates with angle steel flange connections.
However, some issues persisted. If the seams were not properly sealed, air leakage could exceed 50%, with some cases reaching up to 13%. This inefficiency led to significant energy waste. Yet, in practice, how many construction teams truly took these details seriously?
This raises an important question: why do such serious quality issues still exist despite technological progress? The answer lies in the fact that while materials and machinery have advanced, the skills and responsibility of workers may not have kept pace. Many companies still rely on manual labor rather than mechanized production, leading to inconsistencies in quality.
To ensure high-performance and stable quality, it is essential to move toward mechanization and standardized processes. Reducing reliance on manual operations can help avoid many of the common defects seen in traditional ductwork.
Material advancements have also played a key role. While the use of steel-zinc plates has become more automated, the insulation process remains labor-intensive and prone to errors. Recently, new thermal insulation materials like rubber and plastic have emerged, reducing worker fatigue, though they are still expensive and not widely adopted.
In general air conditioning systems, materials like glass fiber ducts and composite ducts have been introduced. Although these represent progress, they are not always suitable for purification projects due to their structure and processing methods. However, the emergence of composite materials marks a positive trend in the industry, reflecting the inevitable direction of technological advancement.
Composite ducts offer several advantages over traditional steel ducts. First, they simplify the insulation process, eliminating the need for separate insulation layers. This not only improves efficiency but also reduces labor costs. Second, composite ducts provide better airtightness due to their bonding technology, which ensures stronger and more reliable joints. Third, they reduce vibration and noise, thanks to their rigidity and built-in damping properties.
Currently, two types of composite ducts are available in China: glass fiber ducts and imported polyurethane or fiberglass ducts. However, these often lack the strength and durability needed for clean engineering applications. A newer solution is the double-sided color plate composite duct, which uses aluminum or flame-retardant polystyrene as the core, offering excellent rigidity, smooth surfaces, and resistance to dust and moisture.
This type of duct is ideal for clean environments, as it is easy to install, cost-effective, and aesthetically pleasing. It also features PVC closed groove flanges that enhance airtightness and reduce energy loss. The card-type connection method simplifies installation, especially in tight spaces.
In conclusion, the future of ventilation ducts in clean air conditioning lies in the adoption of advanced composite materials. By embracing mechanization, standardization, and innovation, we can improve efficiency, reduce costs, and achieve higher-quality results. I also recommend further development of reverse self-locking valves, which offer a simple and reliable solution for airflow control.