370 Chapter 20 1945 Guide But suppose that the saturation efficiency of the apparatus is only 95 per cent, by which is meant that the air delivered by the apparatus is only 95 per cent saturated.

510 Chapter 26___________________________________________ /~ - 1945 Guide - since a reduction of the water.rate may reduce the wetted area within the exchanger10.

570 . .

742 Chapter 43 1945 Guide will translate the pressure difference into rate of flow or total flow. .

66 CHAPTER 3' `1946 Guide The humidity ratio W is the mol ratio Ww/na iimes the ratio of mole cular weights, namely, 18.016/28.966 = 0.6220; hence (13) can be written W = 0.6220 ------ P -- Pw- (14) Now, even if it is assumed that both the dry air and the water vapor.' behave like perfect gases, it does not follow that at saturation the "partial" pressure of the water vapor can be put equal to the saturation pressure of pure water at the temperature of the mixture because; (1) the coexisting liquid (or solid) phase is not pure water but contains a small amount of dissolved air, and (2) the coexisting liquid (or solid) phase has to support the observed pressure p and not just the saturation pressure p, of pure water.

ISO .

158____________ __ ________ CHAPTER 7 J .1946 Guide -In the case of finned tubes, values of hi may be "lower than those obtained by use of Equation 10 and .actual testResults are preferred if available.

258 - CHAPTER* 14- ._________________ 1946 Guide * Table 1. ' Climatic Conditions Compiled prom Weather Bureau Records4 Col.

350 CHAPTER 18 1946 Guide .

456 CHAPTER 24 1946 Guide head available for circulation may be selected from the charts or tables in the same manner as for forced circulation systems.

480 CHAPTER 26 1946 Guide Fig. 1.

672 CHAPTER 38 . 1946 Guide impair performance, a timer-controller causes the dampers to rotate to the opposite side.

860 CHAPTER 47 1946 Guide r =s heat of evaporation of water. s * humid heat of air, i.e., heat necessary to raise 1 lb of dry air 4* H lb of steam IF.

48 Heating Ventilating - Air- - Conditioning, Giiide'1946 KUGEL, H.

446 CHAPTER 23 1948 Guide CONDENSATE RETURN PUMPS Condensate return pumps are used for gravity systems when die local conditions do not permit the condensate to return to the boiler under the existing static head.