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Dear Michael Thanks for your suggestion. For fabric ducts, since we maintain constant cross sectional area, its really amazing to find out that the static regain, more than compensates the friction losses in straight ducts and more often i need to add a damper to reduce the duct pressure to have...

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...

Thanks Newfellaw and haneyrm. I have another question to Haneyrm. When you had used Trane Trace 700 for Energy modelling, how many hours could you analyze in 5-10 minutes? was it Trace 700's defaulted 1100 hours or all the 8760 hours of the year?

Thank you for your answers. I accept controlling noise at source or attenuating in Plant room/AHU is the best way to tackle. and i infer that there is no Non fibrous liner for duct work. Does any one know, why the Active silencer technology (Microphone-speaker combo) was never succcesful

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

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...

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...

Is this a Primary Only system or Primary + Secondary piping 2 way valve (instead of 3-way valve) may be used in the bypass pipe with a pressure sensor modulating this valve This method is usable when the load control valves are of 2-way type and that the pumps are of constant speed type...

The 2 reasons to keep winter design temperature low, 1. the difference in temperature between outdoor and indoor has to be kept to lowest practicable to avoid thermal shocks.Some standards like the Russian SNIP standards even suggest a max deltaT of 8 deg K(does not make sense when temp can be...

Hi, To answer to your question on a)Design Solar. These values are not editable by user and are system calculated based on the latitude and longitude of location. b) The data used for calculation in Carrier software do not use actual measured weather parameters for the specific location. Thes...