Tawada CleanTechFabric Duct andCondensation

Overview:

Condensation is important factor to consider Fabric duct system available in permeable and

imperable fabrics Comparing theory and test – no condensation on

fabric duct system?

Fabric Duct- Theory

Theory: impermeable fabrics is comparable to non-insulated metal duct

Temperature gradient for impermeable fabric is very narrow due to natural convection

(cont.) Theory: With permeable fabrics, conditioned air passes

through the fabric and creates a thin layer around the duct wall of tempered air

This boundary prevents the warm, moist room air from contacting the duct wall and generating condensate

Permeable fabric ducts are direct alternative to insulated or double wall metal ducts

(cont.)

Fig 1:Temperature gradientfor impermeable fabrics

Fig 2:Temperature gradientfor permeable fabrics

Fabric Duct System- Condensation Test

Testes at the Bioenvironmental and Structural Systems (BESS) Laboratory at the University of Illinois

Test: first chamber provided a constant air supply of 300 CFM at 55F and second chamber at 90F

Fabric Duct System- Condensation Test

The test was performed on each of the following samples:

Results - VisualResults – visual (observation of condensation)

Results - WeightWeight – only include moisture weights on surfaceDrippage was not collected or weighed

Results - Temperature

Conlusions

Results reveal a significant reduction in condensation on permeable fabrics

Only mist size droplets and no drippage for impermeable fabrics

Woven exterior of impermeable fabrics reduces risks of drippage

Tawada CleanTechRukan Permata Senayan A 20-21

Jl. Tentara Pelajar no. 5Jakarta 12210 INDONESIA

Ph. 021 5794 1139e. marketing@tawadacleantech.com

w. www.tawadacleantech.com