Heating and ventilating buildings : a manual for heating engineers and architects . uccessively to all partsin the section of the flue, and the average of these resultsshould be used. The velocity in feet per minute multiplied by the area of section in squarefeet should give the numberof cubic reet. The numberof cubic feet of air heatedcan also be computed, as ex-plained in Article 31, page 40,by dividing the heat emittedby the radiator by the prod-uct of specific heat of airand increase in heat which is ab-sorbed by the air can be com-puted by multiplying thatrequired to raise
Heating and ventilating buildings : a manual for heating engineers and architects . uccessively to all partsin the section of the flue, and the average of these resultsshould be used. The velocity in feet per minute multiplied by the area of section in squarefeet should give the numberof cubic reet. The numberof cubic feet of air heatedcan also be computed, as ex-plained in Article 31, page 40,by dividing the heat emittedby the radiator by the prod-uct of specific heat of airand increase in heat which is ab-sorbed by the air can be com-puted by multiplying thatrequired to raise one cubicfoot one degree, as given inTable X, by the total num-ber of cubic feet warmed mul-Fig. Elevation of Apparatus, ^j.^ by the increase in tem. perature. Fig. 31 shows an arrangement adopted by the authorin testing indirect radiators, the air-supply being measured byan anemometer not shown. Testing Hot-water Radiators.—The amount of heat trans-mitted through the surfaces of a hot-water radiator can bedetermined in either of two ways : first, by maintaining circula-. HEAT GilEN OFF FROM RADIATING SURFACES. 95 tion at about the usual rate, measuring the temperature of thewater before entering and after leaving the radiator; also,measuring or weighing the water transmitted. The heat trans-mitted would be equal in every case to the product of the weightof water, multiplied by the loss of temperature. In makingthese tests the same precautions as to removing the air fromthe radiator must be adopted as in testing steam radiators. These radiators can also be tested by filling with water atany desired temperature and noting the time required for thewater to cool one or more degrees. In this case the ironwhich composes the radiator would cool the same amount, anda correction must be added. The easier way to correct for themetal composing a radiator is to consider the weight as that ofthe water increased by that of the iron multiplied by its specificheat. The specific heat o
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