Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances . shown in Fig. illustration presents each ofthe features mentioned above,as in a working plant. Thedifferent parts are shown cutacross through the middle, theblack portion representing only does the water fill theentire system but appears in theexpansion tank when the plantis cold. Hot-water heaters are quitegenerally in the form of intern-ally fired boilers. The fire-boxoccupies a place inside the boiler and is surrounded, except atthe bottom, by the water space. C
Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances . shown in Fig. illustration presents each ofthe features mentioned above,as in a working plant. Thedifferent parts are shown cutacross through the middle, theblack portion representing only does the water fill theentire system but appears in theexpansion tank when the plantis cold. Hot-water heaters are quitegenerally in the form of intern-ally fired boilers. The fire-boxoccupies a place inside the boiler and is surrounded, except atthe bottom, by the water space. Commonly, these boilers aremade of cast iron and are constructed in sections, the same asthe steam boiler shown in Fig. 16. Manufacturers sell a singlestyle for either steam or hot-water heating. The boiler in is cylindrical in form. It is made of wrought iron and con-tains a large number of vertical tubes through which the heatfrom the furnace must pass on its way to the chimney. As the water is heated it expands and rises to the top of theboiler because of its decreased weight. Since the water in the. Fig. 32.—Diagram of a simple formof hot-water heating plant. THE HOT-WATER HEATING PLANT 39 radiator is really a part of the same body of water, the heatedportion rises through the supply pipe to the top of the the hot water rises in the radiator, it displaces an equal amountof cold water, which enters the boiler at the bottom. Thisdisplacement is constant and produces a circulation that beginsas soon as the fire is started and varies with the difference intemperature between the hot water leaving the boiler at the topand the cold water entering at the bottom. As the water in the system is heated and expands, there mustbe some provision made to receive the enlarging volume. Inthis arrangement a pipe connects the bottom of the boiler withthe expansion tank located at a point above the radiator. Underthe conditions represented in the drawing the water does notc
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorkmcgrawhillb
