Cyclopedia of heating, plumbing and sanitation; a complete reference work . dampers are placed at the bases of the flues as already described, toregulate the temperature in different rooms. 195 L86 HEATING AND VENTILATION ELECTRIC HEATING Unless electricity is produced at a very low cost, it is not com-mercially practicable for heating residences r large buildings. Theelectric heater, however, has quite a wide Held of application in heatingsmall offices, bathrooms, electric cars, etc. It is a convenient methodof warming rooms on c1<1 mornings in late spring and early fall,when furnace or st
Cyclopedia of heating, plumbing and sanitation; a complete reference work . dampers are placed at the bases of the flues as already described, toregulate the temperature in different rooms. 195 L86 HEATING AND VENTILATION ELECTRIC HEATING Unless electricity is produced at a very low cost, it is not com-mercially practicable for heating residences r large buildings. Theelectric heater, however, has quite a wide Held of application in heatingsmall offices, bathrooms, electric cars, etc. It is a convenient methodof warming rooms on c1<1 mornings in late spring and early fall,when furnace or steam heat is not at hand. Tt has the special advan-tage of being instantly available, and the amount of heat can be regu-lated at will. The heaters are perfectly clean, do not vitiate the air,and are portable. Electric Heat and Energy. The commercial unit for electricityis one watt for one hour, and is equal to B. T. U. Electricity isusually sold on the basis of 1,000 watt-hours (called Kilowatt-kours),. Fig. 163. Electric Car-Heater. which is equivalent tc 3,410 B. T. U. A watt is the product obtainedby multiplying a current of I ampere by an electromotive force of 1 volt. From the above we see that the B. T. U. required per hour forwarming, divided by 3,410, will give the kilowatt-hours necessary forsupplying the required amount of heat. Construction of Electric Heaters. Heat is obtained from theelectric current by placing a greater or less resistance in its forms of heaters have been employed. Some of the simplestconsist merely of coils or loops of iron ware, arranged in parallel rows,so that the current can be passed through as many coils as are neededto provide the required amount of heat. In other forms, the heatingmaterial is surrounded with fire-clay, enamel, or asbestos, and in somecases the material itself lias been such as to give considerable resist-ance to the current. A form of electric car-heater is shown in Fig. of radiators are shown
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