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Tests were performed to measure pressure losses in light commercialduct systems comprised of wire-wound flexible duct and rigid sheet metal duct. The tests determined the pressure loss associated with various lengths of flexible duct used in multi-branch systems. ASHRAE Handbook guidelines recommend a maximum 6 ft (1.83 m) length of flexible duct for commercial applications. The total pressure loss penalty for a system that utilized 11 ft (3.35 m) of flexible duct branchesconnected to diffusers was 3%, compared to a duct systemmeeting this recommendation. A system using complete lengths of properly sized flexible duct yielded a total pressure loss that was 22% less than a multi-branch system which conformed to prevailing requirements. Regarding the measured flow imbalance in the branches, systems that used flexible duct branch lengths greater than the existing limit of 6 ft (1.83 m) exhibited negligible adverse effects.
Citation: 2020 Winter Conference, Orlando, FL Technical Papers
Product Details
- Published:
- 2020
- Number of Pages:
- 12
- Units of Measure:
- Dual
- File Size:
- 1 file , 2.1 MB
- Product Code(s):
- D-OR-20-016
