Cyclopedia of heating, plumbing and sanitation; a complete reference work . in caseof repairs being needed; and the bottomof the casing should be provided with aslide for inspection and cleaning. Thelarger sections, when used for schoolhouseheating, are arranged as shown in Fig. 19,with a mixing damper designed to causea mingling of the warm and cold air inthe flue, the volume discharged being butslightly reduced, with a decrease in tem-perature due to opening the damper tocold air. The space for the passage ofair between the shallow sections contain-ing about 10 square feet each, is about \of
Cyclopedia of heating, plumbing and sanitation; a complete reference work . in caseof repairs being needed; and the bottomof the casing should be provided with aslide for inspection and cleaning. Thelarger sections, when used for schoolhouseheating, are arranged as shown in Fig. 19,with a mixing damper designed to causea mingling of the warm and cold air inthe flue, the volume discharged being butslightly reduced, with a decrease in tem-perature due to opening the damper tocold air. The space for the passage ofair between the shallow sections contain-ing about 10 square feet each, is about \of a foot; the space between the sectionsof the deep pattern is not far from \ afoot when the sections are properly spaced. Heat Given Off by Steam the heat emitted by direct radiators,approximately one-half is by radiation, the balance by convection orthe contact of air. Since practically no heat is radiated from con-cealed radiators, it is very important that proper provision should bemade for the passage of an adequate volume of air over the ( , Fig. IS. Arrangement of Cas-ings for Use in Connectionwith Indirect Radiators. TABLE IHeat Units Emitted from Radiators and Coils Radiation per square foot of radiating surface per hour.—In rooms at TO F. tempera-ture.—With steam at 3 to 5 pounds pressure. Type of Radiator Heat Units Kmitted (Approximate) Concealed cast-iron direct radiators 175-200 Ordinary cast-iron vertical-section radiators 250 Wall radiators 300 Tipe coils on walls 325 Pipe coils overhead (pipes ftde by side) 350 Ordinary cast-iron extended-surface indirect radiators (air admitted from outdoors) 400 239 16 STEAM AND HOT WATER FITTING Wall radiators and coils give off more heat under the same con-ditions than is emitted by ordinary vertical cast-iron radiators. Much might be said regarding the efficiency of radiators due totheir height, form, and arrangement. For the purposes of this course,however, only fair average values will be
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