Document 93epLBejaQOL2107XVxQQoQL5

666 CHAPTER 30 1952 Guide Fio. 9. Distribution Methods for Small Rooms A. Satisfactopr for cooling. Unsatisfactory for heating in severe climates where the outside tem perature is consistently below 40 F, and single glass and uninsulated walls are prevalent.- B. Performance approximately that.of A.when small diffusers are used in bottom.of the duct. . ,C. Satisfactory for cooling. Satisfactory for heating if direct radiation- is properly controlled. D.' Satisfactory for both coolingand heating. The air should be discharged slightly away from the wall, and-for low velocities, should be fanned out parallel to the wall. theaters, relatively high velocities can be used. These will work satisfac torily if adjustable outlets are used to avoid areas of local turbulence. In small or medium-size theaters, it is sometimes practicable to use side wall or front wall 'distribution. :For the: satisfactory operation of such a system during the winter heating period,, the returns should: preferably be located at the floor level and heir the front of the theater to prevent cold spots which may result from exposed wall convection or infiltration from exits. ; ..... , For mvUi-rocm buildings diagrams shown in'Fig. 9 illustrate distribution methods for small rooms with exposed wall, such as offices, hotel (guest) rooms, hospital (patients) rooms, apartments, etc. For a small store the cooling performance of various distribution methods db j -*r fl ,[j -** ; t t t r t' 1--1 v W V' swv ' <p Fiq; 10. Small Store Cooling Distribution A. Rear Wall. High outlet velocity, satisfactory if properly designed; possibility of excessive air motion and- drafts if used for wrong application B. Front Wall.. High outlet velocity, results same as A. C. Front and Rear Walls. Moderate room air motion, outlet blows should not impinge giving rise to down drafts in center. D. Center. Moderate air motion; no impingement of air streams. Good results. E. One Side. Moderate room air motion; should blow toward exposed wall. Good results. F. Ceiling. Low room air motion. Good results. Outlets should be selected of sufficient size to allow for blocking when not located in perfect squares; Air Distribution 667 is illustrated in Fig. 10. Marine applicationsoi air distribution systems are given in Chapter 47. REFERENCES. Control of Air Streams in Large Spaces, by G. L. Tuve and G. B. Priester (A.S.H.V.E.. Transactions, Vol. 50, 1944, p. 153). .- 'Air Conditioning Principles, by C, O. Mackey (International, Textbook ..Com pany, Scranton, Pa:, 1941, p. 187). * Throw of Air from Slots and Jets, by R. D. Madison and W. R. Elliot (A.S.H.V-.EJournal Section, Heating, Piping and Air Conditioning, Noy,. 1946, p! 108).. 4Modem Air Conditioning, Heating and Ventilating,, by, W.. H. Carrier, R: E: Cherne, and W. A. Grant (Pitman Publishing Corp., New York, N.',Y., 1940).... s A.S.H.V.E. Research Report No. 1155--The Performance-of Stack Heads, by. D. W. Nelson, ltun ,, onu-i Di H. Krans and A. F. Tuthill (A.S.H.V.E. Transactions; Vol. 46; A.S.H.V.E. Research Report No. 1226--Performance of Side Outlets on Hori zontal Ducts, by D. W. Nelson and G. E. Smedberg (A.S.H.V.E. Transactions, Vol. 49, 1943,. p. 58). r. BIBLIOGRAPHY : ; ,/ V Jets .. ..... .. Calculation, of Turbulent Expansion Processes, by W. Tollmien (NACA .Tech. Memo. No. 1085, September, 1945). . Investigations of the Turbulent Mixing Regions Formed- by Jets, by A. M. Kuethe (Joumalof Applied Mechanics, Vol. 2, p. 87,1935). Air Flow at Discharge of. Fan-Pipe Lines in Mines, Part II. by G. E. McElroy (U. S. Bureau of Mines Report of Investigations No. 3730, November, 1943).. vV: -Investigation of Flow in an Axially Symmetrically. Heated Jet of Air, by S.iCorrsin (NACA-ACR No. 3123--declassified--December,-1943). Isothermal and Nonisothermal Air Jet Investigations, by V. Cleeves and L. M. K. Boelter (Chem. Eng. Progress, Vol. 43, No. 3, Trans. Section, March 1947, p. 123). Diffusion of Submerged Jets, by M. L. Albertson, Y.B. Dai,-R. A. Jensen and Hunter Rouse (Proceedings ASCE, December 1948, p. 1571).. --: Air Distribution A.S.H.V.E. Research in Air Distribution and Air Duct Friction,' 'by C. Tasker (A.S.H.V.E. Journal Section, Hailing, Piping and Air Conditioning, April 1948,p. 125). Turbulence--A Fundamental Frontier in Air Distribution, by H. B. Nottage (A.S.H.V.E. Journal Section, Heating, Piping and Air Conditioning, April 1949, p. 115). Air Distribution and Draft, by J. Rydberg and P. Norback (A.S.H.V.E. Journal Section, Heating, Piping and Air Conditioning, January 1949, p. 167). Downward Projection of Heated Air, by Linn Helander and C. V. Jakowatz (A.S.H.VJE. Journal Section, Heating, Piping and Air Conditioning, March 1948, p. 129). Outlet Performance The Rationale of Air Distribution and Grille Performance, by C. O. Mackey (Refrigerating Engineering, June 1938, p. 417). A.S.H.V.E. Research Report No. 1076--Air Distribution from Side Wall Outlets, by D. W. Nelson and D. J. Stewart (A.S.H.V.E. Transactions, Vol. 44,1938, p. 77). A.S.H.V.E. Research Report No. 1206--Performance of Stack Heads Equipped with Grilles, by D. W. Nelson, D. H. Lamb and G. E. Smedberg (A.S.H.V.E. Trans actions, Vol. 48, 1942, p. 279). A.S.H.V.E. Research Report No. 1204--Entrainment and Jet Pump Action of Air Streams, by G. L. Tuve, G. B. Priester, and D. K. Wright, Jr. (A.S.H.V.E. Transactions, Vol. 48, 1942, p. 241). Slots and Perforated Panels Air Discharge from Narrow Slots, by F. F. Stevenson (Heating, Piping and Air