When designing the fabric air duct, it is usually necessary to comply with the following principles:

Fluid Dynamics Principles:

1. Minimize Resistance: Design ducts to minimize internal friction and resistance, ensuring smooth airflow to reduce energy losses.

2. Reduce Pressure Loss: Optimize duct dimensions and maintain smooth internal surfaces to minimize pressure drops and enhance system efficiency.

3. Avoid Sudden Changes and Excessive Bends: Design ducts to avoid sudden changes and excessive bends, which increase resistance and pressure loss.

Material Selection:

1. Durability: Choose fabric materials that are durable enough to withstand operating pressures and temperature variations.

2. Heat Resistance: Ensure selected materials can safely operate within the required temperature range without degradation.

3. Antimicrobial Properties: Select materials with antimicrobial properties, particularly for applications requiring high hygiene standards.

Dimension and Shape Design:

1. Appropriate Size Selection: Select duct diameters or cross-sectional areas based on airflow rates, velocities, and pressure requirements to avoid over-sizing or under-sizing.

2. Smooth Internal Surfaces: Maintain smooth internal surfaces to minimize additional resistance and energy losses due to rough surfaces.

3. Proper Layout and Bend Radius: Ensure duct layout and bends maintain proper radius and angles to minimize energy losses and noise generation.

Connection and Sealing:

1. Secure Connections: Ensure duct connections use appropriate fittings and are securely sealed to prevent air leakage.

2. Effective Sealing: Use suitable sealing materials and techniques to ensure complete sealing at duct joints and interfaces, preventing energy losses and maintaining system efficiency.

Cleaning and Maintenance Considerations:

1. Easy-to-Clean Materials: Choose materials that are easy to clean to maintain hygiene and system performance.

2. Accessibility for Inspection and Maintenance: Consider future inspection and maintenance needs during duct design to ensure easy access and operation.

Installation and Support Structures:

1. Compliance with Standards: Follow relevant installation standards and guidelines to ensure safety and performance.

2. Stable and Durable Support Structures: Design appropriate support structures to prevent duct deformation, vibration, and ensure long-term stability and durability.

These principles provide a comprehensive framework for fabric air duct design, aiming to optimize system efficiency, safety, and long-term performance.