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  • Users: ub313
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  1. ub313

    Absolute roughness for textile ( fabric ) duct material

    Hi All, I am attempting to estimate friction losses for a large duct work which uses textile fabric (in place of traditional galvanized steel sheet). I require help in finding out the ABSOLUTE ROUGHNESS FACTOR FOR FABRIC MATERIAL, Can some one please direct me to this info? Even an order of...
  2. ub313

    Sound Insulation

    Hi Can some one suggest any non-fibrous insulation material for cold supply air ducts. Is it true, polyolefin liners have good noise absorption properties as claimed by the manufacturers? Any industry experience? Thanks
  3. ub313

    Energy Analysis software

    Hi, Can some one please advise, 1)Which software is good for annual energy analysis of HVAC equipment? 2)After data entry, does a normal pc (of uptodate configuration) require a lot of time to process hourly analysis data, for finding energy usage for all 8760 hours. 3) If such analysis is...
  4. ub313

    Design Outdoor temps Vs Peak Load Temps

    Hi can anyone guide me on this? All Cooling Load programs use Design Outdoor conditions of DB and WB (usually from ASHRAE 1% as an example say 89F/73F). But the actual DB/WB conditions (lets say 94/75) when peak load occurence are always different from Design outdoor conditions entered. While...

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