Document Gmk507BB1Kn7DYnB82XzkVKn

American Society of Heating and Ventilating Engineers Guide, 1928 8 o 9 Chapter XIII--Heating with Gas F ig. 1. Gas Consumption per Square F oot of Steam Radiation F ig. 2. Gas Consumption per Square F oot of H ot Water Radiation $ o t> By averaging the records of a large number of gas-boiler installations, the following equations have been derived: For Steam G 110 X R X D H For Water G = 64 X R H X D where G = cubic feet of gas per season R = square feet of direct cast-iron radiation (as calculated) D = degree-days per season H -- B.t.u. (gross) per cubic foot of gas 238 Example.--To estimate the gas consumption for the average heating season for a 200 sq. ft. steam heating system in Chicago. From Table 4 it is found that the average heating season in Chicago has 6007 degree-days. The gross heat value of the gas supplied to that city is 535 B.t.u. per cu. ft. Substituting in the equation: ' G,, =1--1-0---X----2--0-0---X----6--0--0-7 = 247,017 cu. ft. 239