Air is blown at a rate of 180 m3 /min (measured at 21oC and 700 mm Hg) at right angles to a tube bank 10 pipes at 10 spaces wide and 10 rows deep. The length of each pipe is 2.5 m. The tubes are in staggered arrangement, and the center-to-center distance of 8 cm. It is desired to heat the air from 21 to 38oC at atmospheric pressure. Steam at 40 kPa flows inside the 40 standard 1-in. steel pipes. Determine the number of units needed.

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