Most of the values of the exponent \(\mathrm{n}\) in Table 11-3 are positive; however, the exponents for the cost of packing are negative. Explain why.

Table 11-3

Transcribed Image Text:

TABLE 11-3. Reference cost and sizes for use of Eq. (11-5) to determine C. CEPCI = 1000, n is exponent in Eq. (11-5) (Woods, 2007) Size Factor, Range, Ref. cost, Ref. Equipment Column n S S $ size Weight, Mg 0.4- 100,000 8.0 0.58 200.0 Mg Sieve tray, installed, Diameter, 0.9-2.13 2500.0 2.13 0.80 each m 2.13- 2500.0 m 2.01 4.16 2.13 Column + sieve trays Height x 4.0- 545,000 100.0 0.57 Dia 1.5 m2.5 150.0 m2.5 Packing, Pall rings, c/s Packing 2.5-7.6 2500.0/m 2.5 -0.64 Polypropylene Aluminum diameter, 2.5-7.6 1800.0/m cm -0.95 cm 2.5-7.6 3300.0/m 2.5 -0.26 2.7 Column c/s Raschig Height x 0.5-2.8 28,000 2.8 0.65 rings Dia 1.5 m2.5 2.8-85.0 28,000 m2.5 0.9 2.8 Shell & tube heat Area, m 20.0- 70,000 100.0 0.71 exchanger, floating 2000.0 m head U-tube cost 0.87 Kettle reboiler cost x 1.35 Vapor recompression kW 20- 800,000 1000 0.77 refrigeration, 4.4C Volume, m 5000 17,000 kW 0.93 Vertical cylindrical Area, m 0.03-7.0 50,000 1.5 0.79 tank, c/s 7.0-60.0 m Jacketed x 1.2 10.0 Side-entry mixer + m motor x 1.7 Scraped-surface crystallizer, c/s Excludes motor and drive