Mechanical Contracting & Plumbing January-December 1908 . low-ance made for two changes per hour, wewill have reduced the cubic contents toequivalent glass surface () It isnecessary that the loss of heat throughthe change of air in the room shall betaken into consideration in any calcula-tions so as to arrive at the properamount of radiation that will be re-quired to heat the room to any deter-mined temperature. If an allowance ofone change per hour is to be made thedivisor is 50, if a change of only oneevery two hours, then the divisor is100. This loss will be the greatest,other things
Mechanical Contracting & Plumbing January-December 1908 . low-ance made for two changes per hour, wewill have reduced the cubic contents toequivalent glass surface () It isnecessary that the loss of heat throughthe change of air in the room shall betaken into consideration in any calcula-tions so as to arrive at the properamount of radiation that will be re-quired to heat the room to any deter-mined temperature. If an allowance ofone change per hour is to be made thedivisor is 50, if a change of only oneevery two hours, then the divisor is100. This loss will be the greatest,other things being equal, where therooms are on the windward side andwhere they are the most exposed and isvariable according to the wind velocity,and is the least on the more protectedside of the house, so that in this lattercase less radiation is required than inthe first case. 40 \—I—I—I—I—I—I—r—I—I—I—I—I—I—I—I—I—\—1—I—I—I—I—I—\—I—I—I—I—I—1—I—[—\——I—I—I—I—I— 1 3S I I I I I I I I I I I. / 3 J ^ S A 3ff \ /s Chart IV.—Showing amount of hot water radiation required for corner temp., 70 degrees Fahr.; outside, 30 below zero; water, 180 degrees. mate figure of 50 cubic feet of air ishere used as being more convenient forthe purposes of easy calculation, andthe little inaccuracy will make no prac-tical difference in the net results. 4S 4a 33 1 1 1 1 1 1 1 1 1 1 1 ? 33 I 30 I\ ?4 ^ A r /3 Chart III.—Showing amount of hot waInside temp., 70 degrees Fahr.; outs ter radiation required for corner rooms,ido, 20 below zero ; water, 180 degrees. A Practical Illustration. As illustrating the method of de-termining the amount of radiation re-quired and showing how inaccurate anyset percentage or ratio without refer-ence to the total cubic contents of theroom, together with the glass andwall surfaces and the required changesof the air per hour, we will takea room of 4,000 cubic contents,which is to be heated
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