Question
Download Solution PDFThe duct is said to be a low-velocity duct if the mean velocity of air in the duct:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Low-Velocity Duct
- A low-velocity duct is a type of air duct system where the mean velocity of air flow is kept intentionally low to minimize noise, reduce energy consumption, and maintain a more stable and comfortable distribution of airflow. These ducts are typically utilized in systems where efficient energy usage and comfort are prioritized over compactness or high-flow rates.
Criteria for Low-Velocity Ducts:
- In HVAC (Heating, Ventilation, and Air Conditioning) systems, ducts are classified based on the mean velocity of the air that flows through them. The classification helps in determining the design and operational parameters of the duct system. A duct is considered a low-velocity duct when the mean velocity of air is less than 10 m/s. This classification ensures that the air movement remains quiet, and the system operates efficiently without excessive energy losses.
Advantages of Low-Velocity Ducts:
- Noise Reduction: Lower air velocities result in significantly reduced noise levels, making the system suitable for residential, office, and other noise-sensitive environments.
- Energy Efficiency: By minimizing turbulence and frictional losses, low-velocity systems consume less energy compared to high-velocity systems.
- Improved Air Quality: Reduced air speed minimizes particle disturbance and ensures better air filtration, leading to improved indoor air quality.
- Comfort: Low-velocity airflow promotes better thermal comfort by avoiding drafts and ensuring uniform temperature distribution.
Last updated on Jul 15, 2025
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