Cyclopedia of heating, plumbing and sanitation; a complete reference work . AIR VALVE §PLAN ATSUPPLV END FRONT V/EW S/OE V/EW Fig. 138. Heater Especially Adapted to Ventilation where Air does not Have to be Heated above 70 to 80 degrees F. air through it. In ordinary work it is customary to assume a velocityof 800 to 1,000 feet per minute; higher velocities call for a greaterpressure on the fan, which is not desirable in ventilating work. In the heaters shown, about .4 of the total area is free for thepassage of air; that is, a heater 5 feet wide and 6 feet high wouldhave a total area of 5 X 6
Cyclopedia of heating, plumbing and sanitation; a complete reference work . AIR VALVE §PLAN ATSUPPLV END FRONT V/EW S/OE V/EW Fig. 138. Heater Especially Adapted to Ventilation where Air does not Have to be Heated above 70 to 80 degrees F. air through it. In ordinary work it is customary to assume a velocityof 800 to 1,000 feet per minute; higher velocities call for a greaterpressure on the fan, which is not desirable in ventilating work. In the heaters shown, about .4 of the total area is free for thepassage of air; that is, a heater 5 feet wide and 6 feet high wouldhave a total area of 5 X 6 = 30 square feet, and a free area betweenthe pipes of 30 X -4 = 12 square feet. The depth or number of rowsof pipe does not affect the free area, although the friction is increasedand additional work isthrown upon the fan. The efficiency in any 162 HEATING AND VENTILATION 153 given heater will be increased by increasing the velocity of the airthrough it; but the final temperature will be diminished; that is,a larger quantity of air will be heated to a lower temperature
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