Document 2jgg4qOVBqmn7ezvpY1JYzpQL

476 CHAPTER 25 1946 Guide such pans; when the radiator is steam hot and the relative humidity in the room, is between 25 and 40 per cent. This source of supply of moisture alone is not adequate to maintain a relative humidity above 25 per cent on a zero day. REFERENCES A.S.H.V.E. Code for Testing Radiators (A.S.H.V.E; Transactions, VoI. 33, 1927, p. 18). /a Standard Code for Testing .and Rating Concealed Gravity Type Radiation (Steam). A^n.V.E.T^NSACTiONS.Vo .aT^.iO31. p. 367): (Hot Water), (A.S.H.V.E. Transactions, VoI. 39, 1933, p. 237). (See also A.S.H.V.E. Transactions, Vol. 41,1935. p. 38, and Vol. 42,1936, p. 29). tr Rbbo*t No. 998--Factors'Affecting the Heat Output of Convectors, by A; P. Kratz, M. K. Fahnestock, and E. L. Broderick (A.S.H.V.E. Transactions, Vol. 40,1934,'p. 443).. ,. ^"rj^^etors Influencing the Heat Output of Radiators, by A. C. Davis, W. M. Sawdon and David Dropkin (A-S.H.V.E. Transactions, Vol. 42, 1942, p. 185) and Cornell University, Engineering Experiment Station isuUettn No. 29, April, 1942. Bulletino937)TMm Rad*ators' Rubert (Cornell University. Engineering Experiment Station ,r,oi"CoIII?arative Tests of Radiatr Finishes, by W. H. Severns (A.S.H.V.E. Transactions. Vol. 33. 1927, p. 41). '-Heat Loss from Direct Radiation, by J. R. Allen (A.S.H.V.E. Transactions, Vol. 26, 1920, p. 11). U0nCl?33) Radiators' by E* A` AUcut (University of Toronto, School of Engineering, o!,7The Heatin Effect of Radiators, by Charles Brabble (A.S.H.V.E. Transactions, Vol 33 1927 p. 33). . lo-University of Illinois, Engineering Experiment Station Bulletins Nos. 192 and 223. and Investigation of Heating Rooms with Direct Steam Radiators Equipped with Enclosures and Shields, by A. C. Willard. A. P. kratz. M. K. Fahnestock and S. Konzo (A.S.H.V.E. Transactions, Vol. 35, 1929, p. 77). * '--A.S.H.V.E. Research Report No. 962--The Application of the Eupatheoscope for Measuring the Performance of Direct Radiators and Convectors in Terms of Equivalent Temperature, by A C Willard A. P. Kratz and M. K. Fahnestock (A.S.H.V.E. Transactions, Vol. 39,1963, p. 303). ' 1 *"The Kar^ Thermometer--Its Value and Defects, by W; J. McConnell and C. P. Yagloglou. (Reprint No. 953 from U. S. Public Health Service Report, pp. 2293-2337, September 5, 1924). ,, **"The Thermo-Integrator--A New .Instrument for the Observation of Thermal Interchanges, by L..-E. A. Winslow and Leonard.Greenburg (A.S.H.V.E. Transactions, Vol. 41. 1935, p. 149). . xl4wTh-e CaUbraiin Thermo-Integrator, by C.-E. A. Winslow, A. P. Gagge,' Leonard Greenburg, 1. M. Monyamaand E. J. Rodee. {.The American Journal of Hygiene, Vol. 22, No. 1, July, 1935, pp. 137-156). . *57The Globe Thermometer in Studies of Heating and Ventilation, by T. Bedford and C. G. Warner. . {The Journal of Hygiene, Vol. ,34. No. 4). _ ^"A/ScH-v-E-Research Report No. 1067--The Cooling and Heating Rates of a Room with Different Radiators and Convectors, by A. P. Kratz, M. K. Fahnestock and E. L. Broderick (A.S.H.V.E. Transactions, VoI. 43. 1937, p. 389). *'-University of Illinois, Engineering Experiment Station Bulletin No. 230, p. 20. CHAPTER 26 Definitions; Unit Heaters: Classification, Application, Outlet Velocities, Ratings for Various Types, Temperature, Location, Automatic Control, Piping Connections; Boiler Capacity for Steam Unit Heaters; Unit Ventilators: Ratings, Applications, Location, Exhaust Vents; Window Ventilators; Unit Humidifiers DESCRIPTIONS of heating, cooling, ventilating, humidifying, and dehumidifying systems are given in other chapters. This chapter deals with unit heaters, unit ventilators, and unit humidifiers. Cooling units, unit air conditioners, and attic fans are described in Chapter 36. Definitions The generally accepted meaning of the word unit in the terms unit heaters, 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 sup ports 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 describes an assembly of elements whose principal function 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 describes an assembly whose principal function is to ventilate. It may serve to circulate air within the space, or to intro duce 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 diffusers. The term unit humidifier describes an assembly of elements whose principal function is to humidify. The essential element of a unit humid ifier is an atomizer or evaporator. To this may be added a fan, a heater, outlet vanes or diffusers, and a housing to enclose the various parts. Classification UNIT HEATERS The various types of unit heaters which are at present available can 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, (b) 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 type ` which may be equipped with a horizontal or vertical shaft, and (b) 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 477