Duct aspect ratio ashrae

Think of this application as a digital version of the classic Trane Ductulator. The results include both the exact and rounded height and width or diameter dimensions and the calculated velocity and friction loss.

duct aspect ratio ashrae

In the "Size by Dimensions" mode, you can analyze an existing duct system. There are options to input the existing duct dimensions and one of either the airflow or velocity values to derive the calculated duct friction loss. In the "Range of Duct Sizes" mode, you can specify minimum and maximum friction loss and airflow values to display a range of duct sizes that fall in between the friction loss bounds.

You can specify additional parameters such as the duct shape rectangular, round, or ovalthe air temperature and the air pressure. This application uses slider controls that allow you to quickly increment or decrement the input values and immediately observe the calculated results.

This app now works on your iPhone and iPad and adjusts its screen size accordingly. Finally, you can email all of the inputs and results from all 3 input modes to perform further analysis using your desktop computer. The email includes HTML text and a. CSV attachment that can be imported into any popular spreadsheet. Fixed the "negative sign" issue that occurs in iOS 13 2.

Fixed issue with not displaying properly in iOS 13 "dark mode" 3. Optimized the user interface for iOS 13 and iPhone X and 11 screens 4.

Updated help. Up to six family members will be able to use this app with Family Sharing enabled. Screenshots iPhone iPad. Dec 18, Version 5. Size Category Business. Compatibility Requires iOS 8. Compatible with iPhone, iPad and iPod touch. Languages English. All Rights Reserved. Family Sharing Up to six family members will be able to use this app with Family Sharing enabled.

Ductulator - Duct Sizer.Google automatically generates html versions of documents as we crawl the web.

aspect ratio

Duct Design The purpose of air conditioning ductwork is to deliver air from the fan to the diffusers which distribute the air to the room. Air Moves Through the Ductwork in Response to a Pressure Difference Created by the Fan The necessary pressure difference will be a function of the way the ductwork is laid out and sized. The objective of duct design is to size the duct so as to minimize the pressure drop through the duct, while keeping the size and cost of the ductwork to a minimum.

Proper duct design requires a knowledge of the factors that effect pressure drop and velocity in the duct. The total pressure of the airstream decreases as the air proceeds through the the ductwork due to the conversion of mechanical energy to heat caused by friction. Due to fluid viscosity and turbulence in the flow through the ductwork, and occur along the entire length of the ductwork. Velocity at the fan discharge is pre-selected. The duct system is designed to provide progressively lower duct velocities as the air proceeds from the main duct to the branches.

The ducts are sized so the increase in static pressure at each take-off offsets the pressure loss of the succeeding section of ductwork. The inside design temperature is 78 F and the supply air temperature is 60F. The duct must be lined and yet fit under the beam shown below and not exceed a friction loss of 0.

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Determine the most economical duct size. Homework Read 05F Size the ductwork and calculate the maximum pressure drop. The maximum vertical space is 12 inches and the branch fittings are of the same type as the example in the handout. Learn more about Scribd Membership Home.

Read Free For 30 Days. Much more than documents. Discover everything Scribd has to offer, including books and audiobooks from major publishers. Start Free Trial Cancel anytime. Uploaded by Jose Darwin Margate. Document Information click to expand document information Date uploaded May 14, Did you find this document useful?

Is this content inappropriate? Report this Document. Flag for inappropriate content. Download Now. Related titles. Carousel Previous Carousel Next. Jump to Page. Search inside document. Elder, P. Static Regain Method The ducts are sized so the increase in static pressure at each take-off offsets the pressure loss of the succeeding section of ductwork.

Equal Friction Method The duct is sized to result in a constant pressure loss per unit length of duct. Budiman Raharjo'bjo'. Roy Anthone Layson.

Warren Bryer. Hieu Phan. Jose Ignacio Mares Puga.In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. Except as allowed in the Notice to Users and in certain licensing contracts, no part of this book may be reproduced, stored in a retrievable system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the publisher.

A quick overview of the changes is provided in the front of this manual. Meanwhile, a Committee has already begun work on what will be either addenda or a new edition.

Subjects being investigated are ribbed round duct, fatique testing of tie rodded metal, new flat oval duct standards, duct liner pin lengths, more double wall casings, sealant specifications and more performance specifications for joints and reinforcements. And, indirectly related to these standards, significant progress is being made by major mechanical code writing agencies in developing one uniform, consensus-supported code for the entire nation. SMACNA expresses appreciation to the many who have offered suggestions for constructive improvement in the fabrication and installation of duct systems.

Suggestions for future improvement are welcome. Special thanks is given to those who volunteered their time, gave their special knowledge and struggled with development of a consensus that would reflect the needs of a diversified industry. ASTM C —Specification for Adhesives for Duct Thermal Insulation Flammability, smoke development, bond strength, flash point, moisture and temperature effects, edge burning characteristics.

This document or publication is prepared for voluntary acceptance and use within the limitations of application defined herein, and otherwise as those adopting it or applying it deem appropriate.

It is not a safety standard. Its application for a specific project is contingent on a designer or other authority defining a specific use. SMACNA has no power or authority to police or enforce compliance with the contents of this document or publication and it has no role in any representations by other parties that specific components are, in fact, in compliance with it.

The Association may, from time to time, issue formal interpretations or interim amendments, which can be of significance between successive editions. SMACNA encourages technological development in the interest of improving the industry for the public benefit. In the event that the petitioner has a substantive disagreement with the interpretation, an appeal may be filed with the Technical Resources Committee which has technical oversight responsibility.

The request must pertain to a specifically identified portion of the document that does not involve published text which provides the requested information. In considering such requests, the Association will not review or judge products or components as being in compliance with the document or publication. Oral and written interpretations otherwise obtained from anyone affiliated with the Association are unofficial.

What is aspect ratio for duct?

This procedures does not prevent any committee chairman, member of the committee, or staff liaison from expressing an opinion on a provision within the document, provided that such person clearly states that the opinion is personal and does not represent an official act of the association in any way, and it should not be relied on as such. The Board of Directors of SMACNA shall have final authority for interpretation of this standard with such rules or procedures as they may adopt for processing same.

Any Standards contained in this publication were developed using reliable engineering principles and research plus consultation with, and information obtained from, manufacturers, users, testing laboratories, and others having specialized experience. They are subject to revision as further experience and investigation may show is necessary or desirable.

Construction and products that comply with these Standards will not necessarily be acceptable if, when examined and tested, they are found to have other features which impair the result contemplated by these requirements.

duct aspect ratio ashrae

Authorities considering adoption of any standards contained herein should review all federal, state, local and contract regulations applicable to specific installations. Nonexclusive, royalty-free permission is granted to government and private sector specifying authorities to reproduce only any construction details found herein in their specifications and contract drawings prepared for receipt of bids on new construction and renovation work within the Untied States and its territories, provided that the material copied is unaltered in substance and that the reproducer assumes all liability for the specific application, including errors in reproduction.

The Association prescribes acceptable use of the logo and expressly forbids the use of it to represent anything other than possession of membership. Possession of membership and use of the logo in no way constitutes or reflects SMACNA approval of any product, method, or component. Furthermore, compliance of any such item with standards published or recognized by SMACNA is not indicated by presence of the logo.

A list of duct manuals and standards that this edition supersedes is provided in Appendix A Chapter 7 was revised to facilitate use by those interested in equivalent and comparable tests and ratings. Table now features static pressure only as the basis for duct construction classification; velocity levels were deleted.

The default-to-one-inch-pressure-class Pa provisions were retained in case designers do not give construction pressure classes. Predicted leakage rates in unsealed ducts were omitted. Reminders to designers to show all required fire, smoke, radiation and volume control dampers on contract drawings are accented.

Lead radiation shielding is added in the appendix courtesy of the Lead Industries Association. A Ta joint was added as a modification of TThink of this application as a digital version of the classic Trane Ductulator. The results include both the exact and rounded height and width or diameter dimensions and the calculated velocity and friction loss. In the "Size by Dimensions" mode, you can analyze an existing duct system.

There are options to input the existing duct dimensions and one of either the airflow or velocity values to derive the calculated duct friction loss. In the "Range of Duct Sizes" mode, you can specify minimum and maximum friction loss and airflow values to display a range of duct sizes that fall in between the friction loss bounds.

You can specify additional parameters such as the duct shape rectangular, round, or ovalthe air temperature and the air pressure. This application uses slider controls that allow you to quickly increment or decrement the input values and immediately observe the calculated results.

This app now works on your iPhone and iPad and adjusts its screen size accordingly. Finally, you can email all of the inputs and results from all 3 input modes to perform further analysis using your desktop computer.

The email includes HTML text and a. CSV attachment that can be imported into any popular spreadsheet. Fixed the "negative sign" issue that occurs in iOS 13 2. Fixed issue with not displaying properly in iOS 13 "dark mode" 3. Optimized the user interface for iOS 13 and iPhone X and 11 screens 4.

Updated help.

duct aspect ratio ashrae

Up to six family members will be able to use this app with Family Sharing enabled. Screenshots iPhone iPad. Dec 18, Version 5.

Classroom management engagement and motivation task 4

Size Category Business. Compatibility Requires iOS 8. Compatible with iPhone, iPad and iPod touch.

Duct Sizing Step By Step With McQuay Duct Sizer

Languages English. All Rights Reserved. Family Sharing Up to six family members will be able to use this app with Family Sharing enabled.Think of this application as a digital version of the classic Trane Ductulator.

The results include both the exact and rounded height and width or diameter dimensions and the calculated velocity and friction loss. In the "Size by Dimensions" mode, you can analyze an existing duct system.

There are options to input the existing duct dimensions and one of either the airflow or velocity values to derive the calculated duct friction loss. In the "Range of Duct Sizes" mode, you can specify minimum and maximum friction loss and airflow values to display a range of duct sizes that fall in between the friction loss bounds.

You can specify additional parameters such as the duct shape rectangular, round, or ovalthe air temperature and the air pressure. This application uses slider controls that allow you to quickly increment or decrement the input values and immediately observe the calculated results.

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This app now works on your iPhone and iPad and adjusts its screen size accordingly. Finally, you can email all of the inputs and results from all 3 input modes to perform further analysis using your desktop computer.

The email includes HTML text and a. CSV attachment that can be imported into any popular spreadsheet. Fixed the "negative sign" issue that occurs in iOS 13 2. Fixed issue with not displaying properly in iOS 13 "dark mode" 3. Optimized the user interface for iOS 13 and iPhone X and 11 screens 4. Updated help. Requires iOS 8. Compatible with iPhone, iPad, and iPod touch. App Store Preview. Screenshots iPhone iPad. Dec 18, Version 5. Ratings and Reviews See All. Size Log In. The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them.

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duct aspect ratio ashrae

Join Us! By joining you are opting in to receive e-mail. Promoting, selling, recruiting, coursework and thesis posting is forbidden. Students Click Here. Related Projects. I have a low pressure 16"x8" duct that transitions to a 42"x4". The length of the transition is approx 18". The remaining 16x8 downstream of the transition delivers a total of CFM. See attached. Any idea how much static is being lost in this fitting?

No idea, but you may get some static regain when it goes back to the original size. Check the ashrae fundamentals for your C value and velocity pressure, do the calc. The first trnasition is obviously an irregular one. The duct is expanding on the horizontal dimension and at the same time contracting on the vertical dimension.

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Area- or velocity-wise this may be considered as an unsymmetrical expanding transition fitting. This system might have to be installed that way due to physical constraints or for other practical considerations, it loss is definitely not easy or impossible to estimate!

The designer should strive to design and arrange duct fittings according to some fitting standards or database so the system loss can be estimated. Notice too the AR Aspect Ratio of the transitioned piece is or This is considered bad design. In addition to increased surface area, insulation and weight of metal, friction rate and operating cost increase as AR increases.If we can't tunnel through the Earth, how do we know what's at its center? All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply.

Hottest Questions. Previously Viewed. Unanswered Questions. Television and Video. How do you calculate the aspect ratio of a duct? Wiki User The aspect ratio of a duct can be evaluated as the ratio of width to height. As the aspect ratio increases, vibration noise, friction and cost also increases.

Related Questions Asked in Ratios mathematical How do you calculate the aspect ratio of a screen? The aspect ratio of a computer monitor or a television screen is its horizontal length divided by its vertical length, both measured in the same units. That is a aspect ratio. Asked in Computer Monitors Can someone explain the formula for determining aspect ratio for PC monitors In other words how do you know if your aspect ratio is 4X3 or 16X9?

Asked in Home Theater What is the aspect ratio of a widescreen resolution? The aspect ratio of a widescreen resolution is The aspect ratio is the tires profile. The lower the aspect ratio the wider the tire. To calculate duct area, multiply the width of the duct by the height of the duct.

This gives you the area in inches or centimeters, depending on the unit of measure used for the calculation. The aspect ratio is the ratio of width to length, in this case either or Asked in Math and Arithmetic How do you calculate a ratio from a percent? Formula to calculate the ratio.


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