Cyclopedia of heating, plumbing and sanitation; a complete reference work . in tempera-ture between the radiator and the surrounding air, when workingunder ordinary conditions; and this holds true whether it is filledwith steam or water. If we assume an average temperature of 170 degrees for thewater, then the difference in temperature between the radiator andthe air will be 170 — 70 = 100 degrees; and this multiplied by = 110 HEATING AND VENTILATION 101 170, which may be taken as the efficiency of a hot-water radiatorunder the above average conditions. This calls for a water radiator abou
Cyclopedia of heating, plumbing and sanitation; a complete reference work . in tempera-ture between the radiator and the surrounding air, when workingunder ordinary conditions; and this holds true whether it is filledwith steam or water. If we assume an average temperature of 170 degrees for thewater, then the difference in temperature between the radiator andthe air will be 170 — 70 = 100 degrees; and this multiplied by = 110 HEATING AND VENTILATION 101 170, which may be taken as the efficiency of a hot-water radiatorunder the above average conditions. This calls for a water radiator about 1 .5 times as large as a steamradiator to heat a given room under the same conditions. This iscommon practice although some engineers multiply by the factor ,which allows for a lower temperature of the water. Water leavingthe boiler at 170 degrees should return at about 150; the drop intemperature should not ordinarily exceed 20 degrees. Systems of Piping. A system of hot-water heating should pro-duce a perfect circulation of water from the heater to the radiating. Fig. 88. System of Piping Usually Employed for Ht be takento produce a nearly equal resistance to How in all of the branches, sothat each radiator may receive its full supply of water. It will always 111 102 HEATING AND VENTILATION Ik- Pound that the principal currenl of heated water will take the pathof least resistance, and thai a small obstruction r irregularity in thepiping is su
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