224 CHAPTER 10 1950 Guide Braatz (A.S.H.V.E.

232 CHAPTER 11 . 1950 Guide tremely cold weather, and where no provision is made for humidification, the relative humidity may be 20 per cent or less. , Consequently, in using the figures listed in Table 2, consideration should be given to the actual relative humidity to be maintained, if provision is to be made for humidifi cation.

230 CHAPTER 11 1950 Guide Table 1.

234 CHAPTER 11 1950 Guide ticularly important, as the temperature gradient from floor to breathinglevel to ceiling may depend to a large extent on whether direct radiation, unit heaters or warm air is used, and in the latter case, whether the air is moved mechanically or by gravity.

1950 Guide Cooling Load 275 Table 15--Concluded.

302 CHAPTER 12 1950Guide as Affected.by Solar.

316 CHAPTER 13 1950 Guide Representative values for complete combustion of several fuels are given in Table 8. '' ," To produce heat efficiently with any of the common fuels, the following requirements must be observed: (1) adequate heat absorbing surface is necessary; (2) the heat transfer surfaces must be clean; (3) a minimum of excess air should be used; (4) the combustion air and the combustible gases produced by the fuel must be well mixed; and (5) the quantity of com bustible gases escaping to the stack must be kept small.

354 CHAPTER 15 1950 Guide Cast-iron boilers are usually shipped in sections, and assembled at the place of installation.

510 CHAPTER 22 1950 .Guide by radiation.

444 CHAPTER 19 1951 Guide Table 3.

574 CHAPTER 26 1951 Guide of pipe by welding sometimes warrants using lighter wall thicknesses.

1022 CHAPTER 49 1951 Guide D = number of degrees on the thermometer scale which are not immersed.

24 CHAPTER 3 1952 Guide velocity, and energy in the form of enthalpy.

328 .CHAPTER 13 1952 Guide si fa CC4t' aa a .

386 CHAPTER 15 / -* Other items to be considered in boiler selection are: 1952 Guide .