ASHRAE POCKET GUIDE I-P-2013 POCKET GUIDE for Air Conditioning Heating Ventilation Refrigeration (I-P Edition) (8th Edition).pdf

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1、ASHRAEPOCKET GUIDEforAir Conditioning, Heating,Ventilation, Refrigeration(I-P Edition)8th EditionASHRAE 1791 Tullie Circle, NE Atlanta, GA 30329 www.ashrae.orgFront1_title revised from 2009 edition, includes information from Handbooks and ASHRAEStandards 62.1, 62.2, 15, and 55 abridged or reduced to

2、 fit smaller page size“- Provided by publisher.ISBN 978-1-936504-62-6 (softcover : alk. paper)1. Heating-Equipment and supplies-Handbooks, manuals, etc. 2. Ventilation-Handbooks, manuals,etc. 3. Air conditioning-Handbooks, manuals, etc. 4. Refrigeration and refrigerating machinery-Handbooks, manuals

3、, etc. I. American Society of Heating, Refrigerating and Air-Conditioning Engineers.II. Title: Pocket guide for air conditioning, heating, ventilation, refrigeration.TH7011.P63 2013697.92-dc232013044820ASHRAE Staff Special Publications Mark S. Owen, Editor/Group Manager of Handbook and Special Publi

4、cationsCindy Sheffield Michaels, Managing EditorJames Madison Walker, Associate EditorRoberta Hirschbuehler, Assistant EditorSarah Boyle, Assistant EditorMichshell Phillips, Editorial CoordinatorPublishing Services David Soltis, Group Manager of Publishing Services and Electronic CommunicationsJayne

5、 Jackson, Publication Traffic AdministratorTracy Becker, Graphics SpecialistPublisher W. Stephen ComstockUpdates/errata for this publication will be postedon the ASHRAE Web site at www.ashrae.org/publicationupdates.Front1_title previous major contributors were Carl W. MacPhee, Griffith C. Burr,Jr.,

6、Harry E. Rountree, and Frederick H. Kohloss.Throughout this Pocket Guide, original sources of figures and tables are indicated whereapplicable. For space concerns, a shorthand for ASHRAE publications has been adopted.ASHRAE sources are noted after figure captions or table titles in brackets using th

7、e followingabbreviations:Fig FigureTbl TableCh ChapterStd ASHRAE Standard2013F, 2009F, etc ASHRAE HandbookFundamentals2012S, 2008S, etc. ASHRAE HandbookHVAC Systems and Equipment2011A, 2007A, etc. ASHRAE HandbookHVAC Applications2010R, 2006R, etc. ASHRAE HandbookRefrigerationFront3_Preface.fm Page v

8、iii Wednesday, December 18, 2013 5:30 PM 2013 ASHRAE (www.ashrae.org). For personal use only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAEs prior written permission.1AirHandlingandPsychrometrics1. AIR HANDLING AND PSYCHROMETRI

9、CSFigure 1.1 Friction Chart for Round Duct ( = 0.075 lbm/ft3and = 0.0003 ft) 2013F, Ch 21, Fig 1001_AirHandling it has much higher values for diverging discharge outlets.Experimental evidence indicates that, in zone 2,whereVx= centerline velocity at distance X from outlet, fpmVo= Vc/CdRfa= average i

10、nitial velocity at discharge from open-ended duct or acrosscontracted stream at vena contracta of orifice or multiple-opening outlet, fpmVc= nominal velocity of discharge based on core area, fpmCd= discharge coefficient (usually between 0.65 and 0.90)Rfa= ratio of free area to gross (core) areaHo= w

11、idth of jet at outlet or at vena contracta, ftKc= centerline velocity constant, depending on outlet type and discharge pattern (seeTable 1.14)X (1/KcHo)1/2= distance from outlet to measurement of centerline velocity Vx,ftCenterline Velocity in Zone 3. In zone 3, maximum or centerline velocities of r

12、adial andaxial isothermal jets can be determined accurately from the following equations:X 1.5 ARVxVo-KcHoX-=01_AirHandling&Psychro.fm Page 22 Wednesday, December 18, 2013 10:15 AM 2013 ASHRAE (www.ashrae.org). For personal use only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAEs prior written permission.