Users reported that some of the duct fitting families that are included with the revit software have these unexpected properties. Ashrae duct fitting database this database, available on cd, includes loss coefficient tables for more than 200 round, rectangular, and flat oval duct fittings. The use of cfd to analyze and predict the pressure drop along. Trusted windows pc download ashrae duct fitting database 5. With our online resources, you can find ashrae duct fitting database or just. This annual subscription includes cloudbased access to a database of loss coefficient tables for more than 200 round, rectangular, and flat oval duct fittings. We do not yet have a description of ashrae duct fitting database itself, but we do know which types of files our users open with it. Fellow ashrae 0 f the three duct design procedures recommended by the 1997 ashrae handbookfundamentals, only the tmethod incorporates life. These are fittings that are can be found in the duct fitting database but revit is not populating them with the proper fitting designa.
Ashrae duct fitting database this database, available on cd, includes loss coefficient tables for more. Ashrae duct fitting database need installation size. Get ashrae duct fitting database alternative downloads. Ashrae 2012 ashrae duct fitting database v 60001 also available as an ios app from mechanical 101 at university of kuala lumpur. Revit 2015 ashrae duct fitting database no loss defined. Every day, users submit information to about which programs they use to open specific types of files. Ansiashrae standard 1202017 contains one significant change. Search for library items search for lists search for contacts search for a library. Duct design fundamentals pressure losses how loss coefficients are determined c, u u c c u a u n a, a e every fitting has associated loss coefficients, which can be determined experimentally by measuring the total pressure loss through the fitting for varying flow conditions.
Smacnas hvac air duct leakage test manual 1985 to verify the intent. Ashrae duct fitting database, free ashrae duct fitting database software downloads. Qingyan chen, phd, fellow ashrae, is changjiang chair professor and vicent p. One pound per square inch psi, the standard measure of atmospheric pressure, equals approximately 27. Read, highlight, and take notes, across web, tablet, and phone. Make sure to close all programs that are open as this may prevent proper installation.
What we want to get out of this in the end is the proper duct and fitting sizes. It was initially added to our database on 06272010. Ashrae duct fitting database software free download ashrae. Rightcommduct is a fast, easytouse commercial duct sizing and calculation software that takes full advantage of ashraes precision measurements and duct fitting database. This is a conservative value for the preliminary duct sizing and pressure drop estimates, considering a required duct velocity of 2500 fpm reference 2. The american society of heating, refrigerating, and airconditioning engineers ashrae publishes a database that includes loss coefficient tables for many duct fittings. Pressure losses across multiple fittings in ventilation ducts z. This has included active participation in technical and standards committees for professional organizations that serve the hvac industry, such as ashrae, astm, amca, and smacna.
Chapter 22, pipe design, has a new title and now incorporates the content of its sister chapter, pipes. Ashrae duct fitting database is a shareware software in the category miscellaneous developed by ashrae duct fitting database. This app is also compatible with the latest versions of iphone and ipad and ios. Ashrae duct fitting database software free download. Duct fitting pressure loss various duct fitting pressure losses airah da3 or the airah technical handbook more available in the ashrae handbook or smacna obtain other duct fittings pressure losses from manufacturers such as duct heaters, dampers, filters, grilles, coils, etc. This law is useful to explain flow behavior in a duct systems fitting. A given fitting may be assessed to obtain loss coefficient data and. When the ashrae table settings dialog box which can be opened by selecting a duct fitting and clicking the edit button beside loss method settings in the properties palette is opened, none appears in its leftmost panel. Ashrae duct fitting database american society of heating, refrigerating and airconditioning engineers this menudriven databases includes loss coefficient tables for more than 200 round, rectangular, and flat oval duct fittings.
Featuring pictorial outlines of each fitting, this database is useful to design engineers dealing with a variety of duct fittings. Introduction most air conditioning and heating systems require some form of duct work to channel or direct the. These are fittings that are can be found in the duct fitting database but revit is not populating them with. See the elbow charts in the ashrae duct fitting database. This means that it works on both the iphone and ipad and adjusts its screen accordingly. Comments during the icc code cycle for 2021 imc is due on july 16. Ashrae duct fitting database, free ashrae duct fitting database software downloads, page 2.
Ashrae now has a duct calculator with options for 4%, 15%, and 30%. Apr 03, 2012 mep engineers can design duct systems with more accurate duct fittings to meet with ashrae standards by using built in tables that are accessible during design. The application was developed for the iphone, ipod touch and ipad, and allows users to perform pressure. This vav optimization procedure, the nelder and mead downhill simplex method with a penalty approach for integer programming, is applied to several vav duct systems under. Revit 2015 ashrae duct fitting database no loss defined warnings i have a lot of no loss defined warnings appearing and they are all associated with fittings that do not have an associated loss coefficient from the ashrae table. Dfdb maintenance is by ashrae technical committee tc 5. Note that the crosssectional areas at sections 0 lower velocity jet idelchik et al. Mak department of building services engineering, e hong kong polytechnic university, hong kong correspondence should be addressed to c. Ashrae 2012 ashrae duct fitting database v 60001 also. Air flow through a duct system creates three types of pressures. A procedure for predicting pressure loss coefficients of duct fittings using cfd rp1493.
Smacna cad standard second edition v notice to users of this publication 1. Feb 09, 2016 this is a brief of duct design from ashrae. More information about program development can be found by attending the tcs meetings and in the tcs meeting minutes. Ashrae duct fitting database download this database includes. P total the total pressure loss across the duct fitting k t the pressure loss coefficient of duct fitting p v velocity pressure dynamic pressure. Ashrae duct fitting database pdf ashrae duct fitting database pdf are you looking for ebook ashrae duct fitting database pdf. Research project 1493, cfd shootout contest prediction of duct fitting losses. Table of contents hvac systems duct design fourth edition vii foreword. The friction rate based on the actual duct size and flow rates will be used in the detailed design calculation, when. It is important to note that the flow through air ducts is not completely. Duct systems are also divided into three pressure classifications, matching the way supply fans are. No part of this work may be reproduced or used in any form or by any means graphic, electronic, or. Fundamentals distribution systems 2 space availability the sizing criteria will often be defined by the space available to run the ductwork figure 1. A practical approach to design, implementation, connolly, t.
Featuring pictorial outlines of each fitting, this cd is useful to design engineers dealing with a variety of duct fittings. This database, available on cd, includes loss coefficient tables for more than 200 round. A procedure for predicting pressure loss coefficients of duct. Disclaimer of warranties a the sheet metal and air conditioning contractors national association smacna provides its product for informational. The ashrae fitting database is included with the application. Slide 1 hello, my name is ray slaughter and im with the. Wei liu, student member ashrae, is graduate research assistant.
Our own studies united mcgills show that loss coefficients in branch fittings are. Hvac ashrae duct fitting database for ios free download. The hvac ashrae duct fitting database dfdb for the iphone and ipad is now a universal app. Additional fittings and fitting information need to be added. Database toolbar icons is a set of over two hundred images that depict various database concepts, symbols and actions. This program is free and is used to viewprint pdf files. The english unit most commonly used to describe pressure in a duct system is the inch of water gauge inch wg. Each duct fitting in the database is identified by a unique number. With rightcommduct, compute duct and fitting size based on air flow with appropriate velocity limits, and let the software. For any given fitting, the user may enter the flow rate and fitting information and obtain loss coefficient data and associated pressure loss. Ceiling plenums, duct chases, and obstructions such as walls and beams often dictate that a certain size duct be used, regardless of whether or not it is the best size from a. I have a lot of no loss defined warnings appearing and they are all associated with fittings that do not have an associated loss coefficient from the ashrae table. The friction rate based on the actual duct size and flow rates will be used in the detailed design calculation, when the duct layout is finalized.
To specify ashrae fitting types autocad mep autodesk. Research article pressure losses across multiple fittings. We have a certain amount of available static pressure to use up. The latest version of ashrae duct fitting database is currently unknown. Secufiles download ashrae handbookfundamentals 2017 ip. Fan system effect coefficients are only an approximation.
This database, with cloudbased access by annual subscription, includes loss coefficient tables for. The primary objectives of the contest were 1 to gain confidence in the use of cfd to determine the loss coefficients for duct fittings and 2 to eliminate laboratory fitting tests in compliance with ashrae standard 120. Could any of you provide a ashrae friction loss coefficient for the following duct fittings. Upstream velocity of fitting h height of the duct w width of the duct r radius of the bend. A procedure for predicting pressure loss coefficients of duct fittings. Duct system design guide first edition 2003 mcgill airflow corporation mcgill airflow corporation one mission park groveport, ohio 43125 duct system design i notice.
Psychrometrics,ashrae,relative humidity,thermal comfort,ashrae standard 5520,ashrae research project rp1699,2017 climate data,hvac,ashrae duct fitting database,duct design,hvac systems and equipment,refrigerants,moisture management. Ashrae duct fitting database free version download for pc. Revit 20 enhanced ashrae duct fitting database youtube. Ashrae duct fitting database relates to education tools. Ansiashrae standard 1202017 flow resistance of hvac. Rectangular elbows see ashraes duct fitting database program. Air flow problems have plagued the hvac industry for years. Duct fitting database to go 01272011 ashraes duct fitting database dfdb desktop application has become more flexible as a smart phone app, allowing for engineers to make calculations in the field and get results they need quickly. Enhance the appearance of your database with slick, modern icons. Ansiashrae standard 1202017 method of testing to determine flow resistance of hvac ducts and fittings is available on the ansi webstore.
Note that for a loss coefficient less than one, static pressure upstream of the exit is less. January 31, 2011ashraes duct fitting database desktop application has become more valuable as a smart phone app, allowing engineers to make complicated calculations in the field and receive faster results. Purchasers receive a oneyear subscription for cloudbased access to the duct fitting database ver. Chapter 21, duct design, was reorganized for ease of use, and updated for data from the latest version of the ashrae duct fitting database.
Duct design 3 total effective length energy vanguard. Hvac ashrae duct fitting database for ios free download and. Research article pressure losses across multiple fittings in. We use this information to help you open your files. You will be glad to know that right now ashrae duct fitting database pdf is available on our online library. For any given fitting, enter the flow rate and fitting information and. This database, with cloudbased access by annual subscription, includes loss coefficient tables for more than 200 round, rectangular, and flat oval duct fittings. Get pdf the ashrae duct fitting database can then be. This database, available on cd, includes loss coefficient tables for more than 200 round, rectangular, and flat oval duct fittings. Opening the lost method settings dialog box, no ashrea table. Ashrae duct fitting database runs on the following operating systems. Research article pressure losses across multiple fittings in ventilation ducts z. Work is being done by steve idem to introduce equations. The ashrae duct fitting database is a useful resource for determining.
The external tool you use to analyze your system may require that all fittings in the system are assigned an ashrae fitting number. The fitting loss coeffi cients are from the duct fitting database ashrae. Developed for apples iphone, ipod touch and ipad, the ashrae duct fitting database dfdb app allows users to perform pressure loss calculations for more than more. This database cd includes loss coefficient tables for more than 200 round, rectangular, and flat oval duct fittings. Kiran temple university fox school of business 17, course hero intern. In the preferences screen, what is the difference in lost focus, change and use calculate buttons. A procedure for predicting pressure loss coefficients of. Hvac ashrae dfdb help the hvac ashrae duct fitting database dfdb universal app for the iphone and ipad was developed for ashrae by carmel software corporation. Use this mobile app in the field for quick duct pressure loss calculations. For the complete fitting database see the ashrae duct fitting database ashrae 2009. Duct fitting loss coefficients for different design conditions are sought using a duct fitting database program as described in ashrae 1993. Mar 25, 2016 read ocaocp oracle database 11g allinone exam guide with cdrom. Be sure to close any programs that may be open or minimized on the taskbar. Calculate the pressure loss of the duct fitting in a 600mm w x 200mm h duct with a radius of 600mm and a 90 bend angle.
1247 47 1611 77 1295 1249 165 374 1558 516 921 1121 1547 1297 1371 234 402 1348 227 1542 1550 1097 1389 1156 498 9 650 1201 1426 1087 318 1008 913 1249 491 1215 1444 642 578 717 392 1419 731 935 1306 882 894 1247 793