We have a project with York air-handling units with chilled water cooling coils that have copper tubes, copper tube headers and steel pipe nipples for connecting the coil header to the building chilled water supply and return system.
We've challenged York about the galvanic coupling in their...
Looking for some feedback on ductwork design software.
Specifically, I'm considering the Elite Ductsize program or the ASHRAE T-Duct program.
Any pro's or con's you can give for either or any other suggestions for alternative programs would be greatly appreciated.
Currently we use APEC...
For any of you old timers out there:
Does anyone have information regarding the type of rubber gaskets that typically that would have been used for chilled water applications using transite pipe?
We have a chilled water system renovation project that has about 1000 feet of underground transite...
The following is published on page 3-16 of the Crane Technical Paper No. 410 which dates back to 1957 but is still widely used, even by some software programs such as Design Flow Solutions DesigNet.
Saturated Steam 0-25 psig 4,000 to 6,000 fpm
Above 25 psig...
First of all, I'd reconsider the 10F delta T you've selected for the chilled water coils. Why not match your chillers? High delta T primary with low delta T secondary is more common in central hot water plant design with secondary pumps at the building, allowing smaller water mains from the...
Chas:
You've basically hit the nail on the head. With inlet vanes, you're essentially creating a series of fan curves parallel to the wide open inlet vane curve and it results in moving the surge point to the left as you throttle the inlet vane.
I've heard a large fan surging as well as a...
The TRANE System Analyzer software is an excellent tool to do a quick Life Cycle Cost Analysis of several HVAC system alternatives. It does the heating/cooling loads, system/equipment part load simulation for an entire year, has equipment and system cost data, utility rates for cities all over...
Found the answer to my own question on a CD I recently received from FARR Filter Co.
Unfortunately I can't paste it here but if you contact you local FARR sales representative, they can get you the CD.
The article is titled "Wet Filters in HVAC Systems"
Try the following:<br>
<br>
http://www.eren.doe.gov/femp/techassist/softwaretools/softwaretools.html<br>
<br>
It's a government site containing a life cycle cost analysis program, BLCC, developed by the National Institute of Standards and Technology and incorporates the methodology of NIST...
Does anyone know of a "simple" method that's more than a rule of thumb for determining the required capacity of a sump pump for a drain tile system serving the perimeter of a buildings foundation?
Look at NFPA Standard 92B Guide for Smoke Management Systems in Malls, Atria, and Large Areas, Section 2-3 Design Features, sub section 2-3.1, Fault Analysis, and 2-3.2, Reliability. Although the standard doesn't specifically say they should be "fail-safe", one could conclude they should be.<br>...
I've been involved in trouble shooting/critiquing the design of the AHU's at a large new hospital in the midwest where the engineer used a blow-through fan with the chilled water cooling coils and final HEPA filters downstream of the fan. The units were field erected and poorly constructed so...
