Document rRZzydQXx94Q87aBoz1mjveE

530 CHAPTER-23 1950' Guide Graphical Sblutioh of Radiant Panel Areas, by W. P. Chapman and R. E. Fischer {Heating and Ventilating, Jan. 1948, p. 88). Embedaing_ 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. IiaTart {Heating and Ventilating, Nov. 1947, p. 95). ' Panel Heat with Copper Tubing--Experiment in Practice, by D. L. Mills and L. J. LaTart {Heating 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. Joubnae Section, Heating, Piping and Atr CondiUomng, Aug. 1947, p. 111). Panel Heating--A Basic Discussion, by S. Konzo {American Artisan, Oct. 1946, p. 68). :. Solar House Heated by a Warm Air Floor Panel, by John E. Peterson {American Artisan, Dec..1946, p, 83). Design Data for a Warm Air Floor Panel, by Axel B. Algren {American Artisan, Jan.. 1947,- p. ,141); . , ..The.Mechanism of Heat Transfer, Panel Cooling, Heat Storage, by Charles ?. Leopold {Refrigerating Engineering, July 1947, p. 33). Books Hot Water Heating, Radiant Heating and Radiant Cooling, by F. E. Giesecke, 1947 (Technical Book Co., P.'O..Box 62, Austin, Tex.). : .Panel"Healing' and Cooling Analysis; by B. F.Raber and F. W. Hutchinson, 1945 (John Wiley and Sons, New York).' . ", y Radiant Heating, by T. Napier Adlam, 1947 (Industrial Press, 148 Lafayette St., New York). '. Radiant Heating, by R. W. Schoemaker, 1948, (McGraw-Hill Book Co., New York). CHAPTER 24 UNIT HEATERS AND UNIT VENTILATORS Definitions; Unit Heaters: Classification, Application, Outlet Velocities, Ratings, for Various Types, Location, Temperature, Automatic Control, Piping Connections; Boiler Capacity for Steam Unit Heaters; Unit Ventilators: Ratings, Applications, Location, Exhaust Vents; 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. Cooling units and unit air condi tioners are described.in Chapter 25. 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, encased 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; connecting the unit to sources of heat (or fuel), power and water supply and, if neces sary, to vent pipes for combustion gases. The term unit heater denotes an assembly of elements, the principal func tion of which is heating. The essential elements of a unit heater are a fan and motor, a heater, a housing, and outlet vanes or diffusers. The term unit ventilator denotes an assembly, the principal function of which is to ventilate. It may serve to circulate air within the space, or to introduce air from without the space, or may accomplish both purposes. The essential elements of a unit ventilator are a fan and motor, a heater, a set of dampers; a housing and outlet vanes or diffusera. Classification UNIT HEATERS The various types of unit heaters which are at present available cap usually be classified according to one of the three following methods: 1. By type of heater. Under this classification there are three .types of heating elements to be considered : (a) the steam or hot water type, (6) the electric type, and (c) the direct fired,type, which may be gas, oil, or coal fired. 2. By type offan: Under this classification there are two types of fans to be considered :(a) the propeller type1* 2w3hich may be equipped with a hori zontal or vertical shaft, and (6) the centrifugal type which may be designed for horizontal or vertical blow. 3. By arrangement of elements. Under this classification there are two types of heaters to be considered: (a) the draw-through type, in which the fan 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 general classifications. For example, the steam or hot water type may be 531