Has anyone used Trane's CDQ technology? If so I would be interested in any feedback that might be worth sharing: advantages, disadvantages, misconceptions, lessons learned, maintenance issues, perhaps other considerations that may not be mentioned here.
I'm looking at a particular application...
Typically I've seen the HVAC industry's most common rule of thumb for sizing low velocity duct to be:
(.08-.1 " wc/100 ft) for supply duct.
(.05" " wc/100 ft) for return duct.
Does anyone know if these values are published and if so where exactly?
Why the discrepancy between values?
I was...
While searching the ASHRAE website to purchase the 2001 ASHRAE 90.1 Standard I noticed that they offer a User's Manual as well. Is anyone familiar with this manual? Is the entire standard repeated within the manual? The Manual is over double the size of the Standard and if all information is...
I find that typical sizing tables for gas piping are not thoroughly informative for purpose of sizing pipe design. Does anyone have a suggestion that would allow a section by section calculation to accurately determine pressure drop based on demand and pressure?
To clarify my above statement...
I am a graduate mechanical engineer who has worked professionally now for just over five years in HVAC design, and am finding myself increasingly discontent. I am now considering a return to school to attend a graduate program in hopes of further career development. I fell into HVAC design as...
Does anyone out there have a quick lisp or other means of drawing flex duct (basically an arc with smaller alternating arcs or vertices propogated down the large arc)for HVAC plans. This may possibly be done within autocad with no outside lisp; if so I am unaware of it. Anyhow any direction...
Has anyone out there had any relevant experience with instantaneous gas fired water heaters—particularly the Bosch Aquastar 240 FX or similar.
I am currently looking at a job requiring a considerable amount of hot water for domestic use with very limited space in the existing mechanical room...
Does anyone out there wish to make a recommendation for a source to cooling tower desing guidelines, implications, things to consider, do's and don't etc. I would greatly appreciate anyone's input.
