SOLAR ENERGY FOR WATER HEATING — BROOKS 



173 



IVa^er co// //> /i/r/roce, 

 f /rap/ace, or ra/T^e. 



FiGDRB 7. — Solar absorber and furnace coil with single storage tank. 



per person per day, of which one-third is assumed to be heated. The 

 American Society of Heating and Ventilating Engineers recommends 

 an estimate of 40 gallons of hot water per person per day for apart- 

 ment houses. This difference of 3 to 1 is due largely to the convenient 

 availibility of hot water in apartment houses equipped with steam 

 boilers operated by a janitor. 



The data in table 1 were obtained by J. R. Tavernetti from a test 

 installation of a low-wattage electric water heater for the California 

 Committee on the Relation of Electricity to Agriculture. These 

 metered observations covering the daily springtime routine for a 

 family of two adults, two small children, and a baby give a direct 

 intermediate example of hot-water use when an adequate supply is 

 always available from a solar heater operated in series with an auto- 

 matic electric water heater, which was considered expensive to operate. 

 All figures include the quantity wasted in warming approximately 

 40 feet of cold pipe. 



