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

1、ASHRAEPOCKET GUIDEforAir Conditioning, Heating,Ventilation, Refrigeration(SI 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 978-1-936504-63-3 (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 2013b697.92-dc232013044887ASHRAE 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 Thursday, December 19, 2013 9:39 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.1AirHandlingandPsychrometrics1. AIR HANDLING AND PSYCHROMETRIC

9、SFigure 1.1 Friction Chart for Round Duct ( = 1.20 kg/m3and = 0.09 mm)2013F, Ch 21, Fig 1001_AirHandlingstandardbarometricpressureis101.325kPa.Thetemperature is assumed to decrease linearly with increasing altitude throughout the troposphere(lower atmosphere), and to be constant in the lower reaches

10、 of the stratosphere. The lower atmo-sphereisassumedtoconsistofdryair thatbehavesasaperfectgas.Gravityisalsoassumedconstantat the standard value, 9.806 65 m/s2.The values in the table may be calculated from the equationTable 1.13 Standard Atmospheric Data for Altitudes to 10000 m2013F, Ch 1, Tbl 1Al

11、titude, m Temperature, C Pressure, kPa500 18.2 107.4780 15.0 101.325500 11.8 95.4611000 8.5 89.8751500 5.2 84.5562000 2.0 79.4952500 1.2 74.6823000 4.5 70.1084000 11.0 61.6405000 17.5 54.0206000 24.0 47.1817000 30.5 41.0618000 37.0 35.6009000 43.5 30.74210 000 50 26.436Source: Adapted from NASA (197

12、6).Table 1.14 Standard Atmospheric Data for Altitudes to 10000 maAltitude,mTemperature,CPressure,kPa500 18.2 107.4780 15.0 101.325500 11.8 95.4611000 8.5 89.8751500 5.2 84.5562000 2.0 79.4952500 1.2 74.6823000 4.5 70.1084000 11.0 61.6406000 24.0 47.1818000 37.0 35.60010000 50 26.43620000 115 4.328a.

13、 Data adapted from NASA (1976).p 101.325 1 2.25577 105Z5.2559=01_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, m/sVo= Vc/CdRfa= average initial velocity at discharge from o

14、pen-ended duct or acrosscontracted stream at vena contracta of orifice or multiple-opening outlet, m/sVc= nominal velocity of discharge based on core area, m/sCd= discharge coefficient (usually between 0.65 and 0.90)Rfa= ratio of free area to gross (core) areaHo= width of jet at outlet or at vena co

15、ntracta, mKc= 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,mCenterline Velocity in Zone 3. In zone 3, maximum or centerline velocities of radial andaxial isothermal jets can be

16、 determined accurately from the following equations:X 1.5 ARVxVo-KcHoX-=01_AirHandling&Psychro.fm Page 22 Thursday, December 19, 2013 9:56 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.