Ammonia or ammonia compounds are used extensively to manufacture fertilizers, in baking powders, in smelling salts, as a soldering fl ux, and in producing textiles. Consider a double-pipe heat...

Ammonia or ammonia compounds are used extensively to manufacture fertilizers, in baking powders, in smelling salts, as a soldering fl ux, and in producing textiles. Consider a double-pipe heat exchanger in which a refrigerant stream is condensing at 75°F in the annulus and heating ammonia in the inner tube. Ammonia enters the exchanger at a temperature of 14°F and is to be heated to a temperature of 50°F at the outlet. Th e copper tube is 1-1/2 standard type M, 15 ft long. What is the corresponding mass fl ow rate of ammonia? Assume the fl ow to be fully developed hydrodynamically.