Document V3BdrZ5K4ZpDyRR7m0eMZN8Zq

744 CHAPTER 40 7 V .............. 1948 Guide - ... . 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 near the front of-the theater to prevent cold spots which may result from exposed wall convection or infiltration from^exits. . --- Winter convection current Fig. 9. Distribution Methods for Small Rooms A. Satisfactory for cooling. Unsatisfactory for heating in severe climates where the outside'temperature 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 cooling and heating. The air should be discharged slightly away from the wall, and for low velocities should be. fanned out parallel to the wall. Air Distribution 745 *--Throw of Air from Slots and Jets, by R. D. Madison and W. R. Elliot (A.S.H.V.E. Journal Section, Heating, Piping and Air Conditioning, Nov. 1946, p. 108). 4-- Modern Air Conditioning, Heating and Ventilating, by W. 'H. Carrier, R. E. Cherne. and W. A. Grant (Pitman Publishing Corp., New York. N. Y., 1940). 5-- A.S.H.V.E. Research Report No. 1155--The Performance of Stack Heads, by D. W. Nelson, D. H. Krans and A. F. Tuthill (A;S.H.V.E. Transactions, Vol. 46, 1940, p. 205). 6-- A.S.H.V.E. Research Report No. 1226--Performance of Side Outlets on Horizontal Ducts, by D. W. Nelson and G. E. Smedberg (A.S.H.V.E. Transactions, Vol. 49, 1943; p. 58). BIBLIOGRAPHY 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. 1140--The Use of Air Velocity Meters, by G. L. Tuve, D. K. Wright, Jr. and L. J. Seigel (A.S.H.V.E. Transactions, Vol. 45, 1939, p. 645). .1 A.S.H.V.E. Research Report No. 1162--Air Flow Measurements at Intake and Discharge Openings and Grilles, by G. L. Tuve and D. K. Wright, Jr. (A.S.H.V.E. Transactions, Vol. 46, 1940, p. .313). ' A.S.H.V.E. Research Report No. 1165--Development of Instruments for the Study of Air Distribution in Rooms, by A. P. Kratz, A. E. Hershey and R. B. Engdahl (A.S.H.V.E. Transactions, Vol. 46, 1940, p. 351). 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. Trans actions, Vol. 48, 1942, p. 241). Air Flow at Discharge of Fan Pipe Lines in Mines, by G. E. McElroy, (Bureau of Mines, Report of Investigations--No. 3730, November, 1943). The Rationale of Air Distribution and Grille Performance, by C. O. Mackey (Refriger ating Engineering, Vol. 35, No. 6, June 1938, p. 417). Fig.. 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. j 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. For multi-room buildings diagrams shown in Fig. 9 illustrate distribu tion 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 is illustrated in Fig. 10. Marine applications of air distribution systems are given in Chapter 49. REFERENCES 1 --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 Company, Scranton, Pa., 1941) p. 187;