A 23⁄4 in × 5 in × 24 gauge-11⁄4-in steel tube convector has an output of 860 Btu/hr per foot of tube at a fluid temperature of 200°F. A classroom in an elementary school has a heating load of 17 850 Btu/hr.
a. Determine the length of convector tube (in feet) needed to meet the load.
b. At a flow rate of 1 gal/min (8.3 lb/min), determine the temperature of the water leaving the convector, if the water enters the convector at a temperature of 200°F.