Document 8O5Q0vRMRb1XKdgdQv2op766k

586 CHAPTER 24 1955 Guide Radiant Heating (Heating and Ventilating, March, 1941, p. 35). Radiant Heating and Cooling, by F. E. Giesecke (Heating, Piping and Air Condi tioning, June, July, August, September and October, 1940). Calculations for Radiant Heating, by T. Napier Adlam (Heating and Ventilating OcRtoabdeira, n1t9H31e).ating and'Cooling, Part I, by C. O. Mackay, L. T. Wright, Jr., R. E. Clark, and N. R. Gay (Cornell University Engineering Experiment Station, Bulletin NoD. e32s,ig1n9M43e).thod for Panel Heating Systems Using Copper Tubing, by R. G. Vander-weil (A.S.H.V.E. Journal Section, Heating, Piping and Air Conditioning, Nov. 194A7,irpT. e12m3p).erature Gradients in a Panel Heated Room, by. J. M. Ayres and B. W. Levy (A.S.H.V.E. Transactions, Vol. 54, 1948, p. 131). Graphical Solution of Radiant Panel Areas, by W. P. Chapman and R. E. Fischer {Heating and Ventilating, Jan. 1948, p. 88). Embedding Coils in Radiant Heating Panels, by D. L. Mills and L. J. LaTart (Heating and Ventilating, Dec. 1947, p. 75). Radiant Heat with Copper Tubing, by D. L. Mills and L. J. LaTart {Heating and Ventilating, Nov. 1947, p. 95). Panel Heat with Copper Tubing--Experiment in Practice, by D. L. Mills and L. J. . LaTart {Healing and ventilating, Oct. 1947, p. 65). Experimental Studies on Panel Heating Tube Spacing, by B. F. Raber and F. W. Hutchinson (A.S.H.V.E. Transactions, Vol. 53, 1947, p. 369). Panel Heating--A Basic Discussion, by S. Konzo {American Artisan, Oct. 1946, p. 6S8o)l.ar House Heated by a Warm Air Floor Panel, by John E. Peterson {American ArtDiseasnig, nDeDca. t1a94fo6,r pa. W83a).rm Air Floor Panel, by Axel B. Algren (American Artisan JanT.h1e94M7,ecph. a1n4i1s)m. of Heat Transfer, Panel Cooling, Heat Storage, by Charles S. Leopold {Refrigerating Engineering, July 1947, p. 33) Radiant Heating--Simplified Design and Installation {Copper and Brass Research Association, 1949). Research Report No. 1387--Laboratory Studies on Heat Flow Within a Con crete Panel, by C. M. Humphreys, H. B. Nottage, C. V. Franks, R. G. Huebscher, L. F. Schutrum and D. W. Locklin (A.S.H.V.E. Transactions, Vol. 56, p. 175). Research Report No. 1388--Heat Flow Analysis in Panel Heating or Cooling Sections, by L. E. Hulbert, H. B. Nottage and C. V. Franks (A.S.H.V.E. Trans actEiolencst,riVcoAl.n5a6lo, g1g95e0r, Spt.u1d8ie9s). on Panels with Imbedded Tubes, by Carl F. Kayan (A.S.H.V.E. Transactions, Vol. 56, 1950, p. 205). Books Hot Water Heating, Radiant Heating and Radiant Cooling, by F. E. Giesecke (Tech nicPaal nBeoloHkeCaoti.n, gPa. n0d. BCoooxli6n2g, AAnuastlyins,isT, ebxy. B19. 4F7.).Raber and F. W. Hutchinson (John WRileaydiaanndt HSeoantsi,ngN,ebwyYTo.rNk,a1p9ie45r )A. dlam (Industrial Press, 148 Lafayette St., New YoRrakd1ia9n47t )H. eating, by R. W. Shoemaker, 1948 (McGraw-Hill Book Co., New York)Chapter V (pages 103-115) of Heating and Air Conditioning, by J. R. Allen, J. H- Walker, and J. W. James (McGraw-Hill Book Co., New York--Sixth Edition, 1946)Chapter 12 (pages 363-392) of Heating, Ventilating and Air Conditioning Funda mentals, by W. H. Severns and J. R. Fellows (John Wiley and Sons, New York, Second Edition, 1949). CHAPTER 25 UNIT HEATERS AND UNIT VENTILATORS Definitions; Unit Heaters: Classification, Application, Ratings, Location, Space Temperatures, Control, Piping, Maintenance, Boiler Capacity; Unit Ventilators Ratings, Capacity Requirements, Application, Selection, Control, Location, Exhaust Flues; Window Ventilators DESCRIPTIONS of heating, cooling, ventilating, humidifying, and dehumidifying systems are given in other chapters. This chapter deals with unit heaters and unit ventilators. Unit air conditioners and unit coolers are discussed in Chapter 26. Definitions The generally accepted meaning of the word unit in the terms unit heat ers, unit ventilators, and unit humidifiers, is that of a factory-made en cased assembly of the functional elements indicated by its name. Such units can be shipped complete or in sections, so that the only field work necessary is the assembling of the sections, providing proper supports, and connecting the unit to sources of heat (or fuel), power and water supply and, if necessary, to vent pipes for combustion gases. The term unit heater denotes an assembly of elements, the principal function of which is heating. The essential elements of a unit heater are a fan and motor, a heating element, a housing, and outlet vanes or diffusers. Some types are shown in Figs. 1 to 4. The term unit ventilator denotes an assembly, the principal function of which is to ventilate and cool the space by the introduction of outdoor air. It may serve to heat and circulate the air within the space, or introduce air from outdoors, or may accomplish both in varying proportions. The essential elements of a unit ventilator are fans and motor, heating element, dampers, and outlet grilles or diffusers, all encased in a housing. Classification UNIT HEATERS The various types of unit heaters which are at present available can usu ally be classified according to one of the three following methods: 1. By type of healer. Under this classification there are three types of beating elements to be considered: (a) the steam, or hot water type, (b) the electric type, and (c) the direct fired type which may be gas, oil, or coal fired. 2. By type of fan. Under this classification there are two types of fans J "e considered: (a) the propeller type1 and (b) the centrifugal type. Either lype may be arranged for horizontal or vertical delivery of air. 3. By arrangement of elements. Under this classification there are two ypes of heaters to be considered: (o) the draw-through type, in which the an draws air through, and (6) the blow-through type, in which the fan blows air through the heater. Unit heaters are available in any combination of the three preceding gen- 587