%MurNBfriction040351; ]> Memorandum from A. C. Menius, Jr. to Clifford Beck [a machine-readable transcription] Menius, A. C., Jr. Creation of machine-readable version: Russell S. Koonts Creation of digital images: Russell S. Koonts Conversion to TEI.2-conformant markup: NCSU Science and Technology Electronic Text Center. ca. 9 kilobytes NCSU Libraries. Raleigh, NC. Modern English, MurNBfriction040351

Available from: NC State University Archives

Publicly-accessible

URL: http://www.lib.ncsu.edu/archives/etext/engineering/reactor/murray/

 2000

Nuclear Reactor Digitization Project

Raymond L. Murray Reactor Project Notebook

 Illustrations have been included from the print version. Scanned by Russell Koonts with Photoshop 5.0 software. Memorandum from A. C. Menius, Jr. to Clifford Beck <author>A. C. Menius, Jr.</author> <respStmt> <resp/> <name/> </respStmt> </titleStmt> <editionStmt> <p></p> </editionStmt> <extent>1 p.</extent> <publicationStmt> <publisher></publisher> <pubPlace></pubPlace> <date></date> <idno>Manuscript copy consulted: NCSU Libraries call number UA105.16</idno> </publicationStmt> <seriesStmt> <p/> </seriesStmt> <notesStmt> <note></note> </notesStmt> </biblFull> </sourceDesc> </fileDesc> <encodingDesc> <projectDesc> <p>Prepared for the NCSU Libraries Science and Technology Electronic Text Project.</p> </projectDesc> <editorialDecl> <p>Spell-check and verification made against printed text using Notetab spell checker.</p> <p>The lineation of the manuscript has been maintained and all end-of-line hyphens have been preserved.</p> <p>The images exist as archived TIFF images, one or more JPEG versions for general use, and thumbnails.</p> <p id="ETC">Keywords in the header are a local Electronic Text Center scheme to aid in establishing analytical groupings.</p> </editorialDecl> <refsDecl> <p>ID elements are given for each page element and are composed of the text's unique cryptogram and the given page number, as in NEprop033050a for the title page of Clifford Beck's Proposal.</p> </refsDecl> <classDecl> <taxonomy id="LCSH"> <bibl> <title>Library of Congress Subject Headings April 3, 1951 English non-fiction; prose LCSH 24-bit color; 400 dpi Memorandum from A. C. Menius, Jr. to Clifford Beck Typescript 1 p. April 3, 1951 MurNBfriction040351

NCSC-9 April 3, 1951 TO: Clifford Beck FROM: A. C. Menius, Jr. SUBJECT: Friction Loss in Stack

The Chesy's formula is generally used to determine the friction loss in inches of water for chimneys. This is

whereDc= friction loss in in. of H20 K= coefficient including friction and reduction factors V= velocity of air in ft/sec. H= height of stack above intake in ft. D= mean diameter of stack Tc= mean absolute temperature of gas

The value of K is about 0.008 for air and a brick lined chimney. This is the algebraic mean of the values assumed by various authorities.

In the proposed building for the N. C. State reactor 25,000 cfm of air must be removed. The temperature of the air can be assumed to be about 78°F so as to give an effective working temperature in the building of about 72°F. A table below gives Dc as a function of the stack diameter at a stack height of 100 ft.

Diameter of Stack in FeetFriction Loss in Inches of H20 40.41 50.130 60.054 70.025 80.013

The friction loss for any height can be obtained from this table by multiplying by 0.01H. It can be seen that the losses arc small in general and after the losses in the ducts have been estimated it will be possible to choose a blower to do the job. If the stack is assumed to be 110 feet with a 6 foot diameter than the loss will only be 0.059 inches of water, Blowers develop with ease in the capacity needed pressure differences of 2" of H20. The difference between this and the loss in stack is certainly suffIcient for duct losses.

CC: Reactor Committee

Steampower Plant Engineering Gobhardt, page 304