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f American Society of Heating and Ventilating Engineers Guide, 1932 Chapter 6--Radiators varies inversely as the height of the coil. It is customary to use an average emission of 100 Btu per linear foot of lj^-in. pipe, 10 ft high. The heat emission of each pipe of ceiling coils placed horizontally (pipes horizontal) is equal to that of a single row coil. Allowance must be made, however, if the coil is at the ceiling in a higher temperature than that upon which Table 2 is based, namely, 70 F. The common practice is to allow 126 Btu, T able 3. Conversion F actors for D irect Cast- I ron Radiators ting under the indicated conditions. Fig. 1. Air Temperature Gradients from Floor to Ceiling for Column and Wall-Type Radiators , .Note that all three radiators maintained about the same temperature at the Comfort Lesd. 156 Btu and 175 Btu per linear foot of pipe, respectively, for 1-in., l)4'in- and lj^-in. coils. Code for Testing Radiators The A.S.H.V.E. Code for Testing Radiators1 assumes.the following relationship as applicable to the average run of cast-iron radiators: H = K (is - tv) (1) where H = the rate of heat emission in Btu per hour per square foot of surface. K = a constant <s = the temperature of radiator (assumed to be the temperature of the steam or hot water). ; <r = the temperature of the room in which"the radiator is located. A.S.H.V.E. Transactions. Vol. 33. 1927. 98 99