Featuring pictorial outlines of each fitting, this database is useful to design engineers dealing with a variety of duct fittings. For any given fitting, enter the flow rate and fitting information and obtain loss coefficient data and associated pressure loss. The product includes table data for supply, exhaust, and common (supply/return) duct functions. Fittings may be saved into a project file, which is easily navigated and can be stored and transferred.
ASHRAE Duct Fitting Database (DFDB) for the iPhone, iPod touch, and iPad allows you to perform pressure loss calculations for ASHRAE duct fittings in both I-P and SI units. Use this mobile app in the field for quick duct pressure loss calculations. The inputs can be adjusted by touch, and installation is automatic. Purchase this product from iTunes for $9.99 Learn More
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Standard 120-2017 --Method of Testing the Determine Flow Resistance of HVAC Ducts and Fittings
ASHRAE Standard 120 establishes uniform methods of laboratory testing of HVAC ducts and fittings to determine their resistance to airflow.
5. I would like to look at the loss coefficient data used in this program. How do I do this?
All coefficient data is contained in a text file with a .tbl extension. To view this data, choose a fitting, and from the File menu, choose Preview Tbl...
6. What changes were incorporated into the latest version of this program?
Version 6 includes includes an integrated database; fully available input, output, calculations, and table data properties; and easily viewable calculations that update in real time.
I started manipulating the elbow duct fitting and replaced the connectors with regular global/bidirectional connectors and assigned a pressuredrop. So far I have to manually enter the pressuredrop, but it seems to work in a system, and also works with auto-route.
Then in the project, set all the Loss Method for all of the fittings to "Specific Loss" (you can do this with a Dyanamo script or using a duct fitting schedule). After all this, the built in pressure drop calculator will work fine.
In the project it still is set to ASHRAE. But if I try out and set the pressuredrop to 1", the system pressuredrop raises by 1" and that branch becomes the critical path. Obviously this isn't a validation of my family yet....but tying the pressuredrop value to the duct connector seems to override whatever the project does with fittings. (Don't quote me on that.....:-)
But I created a duct fitting schedule and included ALL available parameters, but I can't see one that looks like it is setting the calculation method. which parameter do yo mean to set the "loss method"? I came across similar advice in a different thread, but seem to not be able to see such parameter in a schedule.
As for other fittings, I will look into each one I use if they behave OK oob, or if they need adjustment. Elbows seem to be the most urgent since a duct system has many elbows compared to other fittings. I saw for tabs Revit uses a different fitting that is less efficient than mine. but I'm less concerned about that since that likely just gives me a tiny bit too much pressure drop and would be conservative. Maybe i will, but i wasn't planning to re-create all the fittings.
The Loss Method isn't schedulable, but you can create a schedule of all of the duct fittings, select them all in the schedule, then click your Default 3D View and you will have all of the duct fittings in the project selected, you can then change the loss method of all of them to Specific Loss in one click as opposed to having it done fitting by fitting.
then click your Default 3D View and you will have all of the duct fittings in the project selected, you can then change the loss method of all of them to Specific Loss in one click as opposed to having it done fitting by fitting
I noticed another oddity. I used the SMACNA fittings since i onw the SMACNA HVAC System Design guide. thsoe C-values seem to be higher than the ASHRAE values. I don't have the ASHRAE fitting database or design guide, so i rely on what Google shows me and what is in the pressure report. but for gored and die-stamped fittings, the SMACNA values seem to be higher by a bit. Did anyone else notice that or have an explanation? The engineer in me would use the higher (SMACNA) values. but this drives me even more to use my own calcs.
For the fittings where ASHRAE adjusts the C-factor based on diameter, it looks like SMACNA data are equal to what ASHRAE has for 8"-10" duct size. For larger ducts, the ASHRAE factor gets smaller. So SMACNA will be more conservative for larger ducts.
I tried to "flush out" the default ASHRAE fitting setting in the fitting family. I took the family, converted it to a mechanical family, saved it. then converted it back to a duct fitting. but it still "remembered" the ASHRAE options it had assigned. When I create a duct-fitting from scratch (from generic template, then convert to duct fitting), the ASHRAE options are blank and I ASSUMME it would then not use an ASHRAE value, but only use my calculated value.
I basically went through my duct system and manually verified if the fitting showed reasonable values compared to SMACNA. OOB the taps don't have any pressure drop, transitions default to a lower loss fitting than actual, elbows only use the 1.5D (even if it is 1D), some transitions don't have a pressure drop at all.... it is a mess. You can't use that for design. So for all the one I use I add "my" scheme and then select them to set loss method to "not defined". if you replace or add a fitting, you have to do that again.
One caveat is, that if you replace a fitting (i.e. swap a 1.5D in instead of a 1D) it doesn't seem to read the flow for the pressure calcs (it passes the flow through, though). Sometimes i have to just wait, reconnect the duct, or change the flow value forth and back to trigger re-calculation. So for QC it is good to check each fitting if they actually calculate a pressure drop (tag helps). Carefully review the pressure loss report and each fitting.
I don't own a ASHRAE fitting database, so I can't tell if they just don't have enough data or if they only have fittings I don't use. Like they often seem to only have a 1.5D version of an elbow, but not a 1D etc.
I think it would be better if Revit did away with the ASHRAE data and just did something similar to what I did in the family and the oob families then just have standard C-values and the user can adjust them. What they created just results in wrong (often too low) data and gives them a bad reputation. I read from many people they don't trust the Revit duct calcs. I think the whole duct calculation is really great and better than 3rd party software or manual calcs. But the fitting implementation really is bad. I bet they put a lot of engineering and programming in this - but they probably never talked to a designer.
When we design duct and pipe fitting, we will need to use the fittings loss efficient to be ASHRAE or CIBSE. Once in a blue moon, ASHRAE will update their duct fitting loss efficient. Since Revit have ASHRAE in its system, what is the ASHRAE duct fitting database version Autodesk is supporting now? v6.0.0.5?
Hi Mariah, there is a lot of fittings that have issues with the Co-efficient calculation from the ASHRAE TABLE on the ducts and Pipe fittings. I have traced it back a couple of years now if you look at the forum.
Hello @mariah.ferranti this is also an issue for me. I have a lot of issues with the co-efficient calculations from the ASHRAE table on the ducts and pipe fittings. Is there any plan to fix this, or is this a low priority issue? Unfortunately, these issues make the system pressure portion of the software next to useless, because I am having to do calculations by hand again.
@Anton_Welgemoed Did you find a post on the ideas forum that supports this issue?
Another problem is that the fitting only works when the Ds dimension (downstream side of the main) is smaller than the upstream side. Sometimes you may not want to transition the duct to a smaller size.
I created a new duct fitting from scratch, and that shows no ASHRAE tables. But I don't want to re-create the geometries of a fitting, and i fear once it becomes an actual fitting, it will go back to using the ASHRAE tables. No sure, though, how a fitting actually decides what table to use.
Also from the ASHRAE line-up, this app can aid in the duct fitting process by performing pressure loss calculations. More than 240 duct models are included, with measurement possible in both imperial and metric units. Illustrations of each design are included. Users can e-mail reports and spreadsheets out as well.
This database, available on CD, includes loss coefficient tables for more than 200 round, rectangular, and flat oval duct fittings. Featuring pictorial outlines of each fitting, this CD is useful to design engineers dealing with a variety of duct fittings. For any given fitting, the user may enter the flow rate and fitting information and obtain loss coefficient data and associated pressure loss. The CD includes table data for supply, exhaust, and common (supply/return) duct functions, and is fully printable. Fittings may be saved into a project file, which is easily navigated through using a pop-up navigation window and is small enough to be stored and transferred. Also, an "Explorer" view gives the user an integrated graphic view of all fittings and headings.
The ASHRAE Duct Fitting Database (DFDB) for the iPhone and iPad is now compatible with iOS 16 and iPhone 14 Pro.
The ASHRAE DFDB app allows you to perform pressure loss calculations for all 250+ ASHRAE duct fittings in both IP and SI units. Features include dynamic illustrations of each design, and the ability to share reports and spreadsheets through email.
This app is based upon the popular ASHRAE Duct Fitting Database desktop and web applications. The advantages of this mobile app are that you can easily use it out in the field to do quick duct pressure loss calculations, the inputs can be adjusted by touch, and installation is automatic.
The following is a partial list of features:
1. You can create individual projects, each with unique input values and results.
2. Each fitting has its own custom set of input parameters and results.
3. You can easily change the minimum and maximum allowable values for all input parameters.
4. It includes a useful search feature that allows you to type in a partial or full fitting code name to quickly retrieve it.
5. It allows you to display and email two types of reports. The app reports also include a spreadsheet attachment that you can open on your desktop computer to do further analysis.
6. The app displays inputs and results in both IP and SI units.
7. Works on both the iPhone and iPad and adjusts its user interface according to the proper size screen.
The ASHRAE Duct Fitting Database application was designed by Carmel Software Corporation exclusively for ASHRAE. be457b7860
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