. Power, heating and ventilation ... a treatise for designing and constructing engineers, architects and students. 77777?7 Fig. 95. Circuit System of Hot-Water Heating. a point near the ceiling, and from here makes a complete circuitof the basement with a slight downward pitch. The supply risers are taken from the top of the main and thereturns are connected into the side 5 or 6 feet away in the direc-tion of flow. As the cooler return water passes into the samepipe it is evident that the temperature of the supply falls con-tinuously throughout its length, and the sizes of the successiveradiat
. Power, heating and ventilation ... a treatise for designing and constructing engineers, architects and students. 77777?7 Fig. 95. Circuit System of Hot-Water Heating. a point near the ceiling, and from here makes a complete circuitof the basement with a slight downward pitch. The supply risers are taken from the top of the main and thereturns are connected into the side 5 or 6 feet away in the direc-tion of flow. As the cooler return water passes into the samepipe it is evident that the temperature of the supply falls con-tinuously throughout its length, and the sizes of the successiveradiators must be increased to offset it. In dwellings or apart-ments of eight to twelve rooms it will usually be sufficient to HOT-WATER HEATING BY GRAVITY CIRCULATION 135 increase the surface of the last radiator about 15 per cent and theintermediate ones in proportion. Overhead System.—Fig. 96 shows a system of piping oftenused with very satisfactory results. A single riser extendsdirectly to the expansion tank, from which branches are carriedto the radiators as shown. With this system of piping the air hI^. 1. V>X/VX/V^^^- Fig. 96. Hot-Water, OTerhead System of Piping. liberated from the water rises at once to the expansion tank andescapes through the vent, thus preventing to a large extent itscollecting in the radiators. The principal objection to this arrangement is that the waterin the tank is under a less pressure than in the boiler, hence, ifthe temperature is raised above SIS the water will break intosteam upon reaching the tank. No trouble will be experiencedfrom this, however, at the temperatures ordinarily carried inhouse-heating work, and no damage will result if the tank isproperly vented. The advantages of air venting noted above may be retained 136 HEATING AND VENTILATING PLANTS To ExpansionTank. without the objectionable features, by simply making a smallconnection between the top of the riser and the tank, instead ofhaving the entire volume of water pass throu
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