Page 374 - Mechanical Engineers' Handbook (Volume 4)

1500 34.9 34.4 34.0 33.6 33.2 32.7 32.3 30.2 28.0 25.8 23.6 21.3 19.0 16.7 14.4 12.1 rise heat to the of Btu/

due heats gross
1400 32.2 31.8 31.4 31.0 30.6 30.1 29.7 27.6 25.4 23.2 21.0 18.8 16.5 14.2 11.9 9.57 Btu 0.24 F lb loss specific 1,392,000

heat the the
1300 29.7 29.3 28.8 28.4 28.0 27.6 27.2 25.0 22.9 20.7 18.5 16.3 14.0 11.7 9.43 7.11 lb 0.076 3 ft and (c) and 1000

gases air, 1392
1200 27.1 26.7 26.3 25.9 25.5 25.1 24.6 22.5 20.4 18.2 16.0 13.8 11.6 9.30 7.01 4.69 min hr flue of that finds
60 dry to as
1100 24.7 24.3 23.8 23.4 23.0 22.6 22.2 20.1 17.9 15.8 13.6 11.4 9.16 6.91 4.63 2.32 gas. scf min loss same example
cfh rise heat for the not the

F 1000 22.2 21.8 21.4 21.0 20.6 20.2 19.8 17.7 15.5 13.4 11.2 9.03 6.81 4.56 2.29 1392 temp corrects are whereas
‘‘Air’’ Btu gas heat which H 2 O) and Btu/hr:

Outlet Temperature, 900 19.9 19.5 19.0 18.6 18.2 17.8 17.4 15.3 13.2 11.1 8.90 6.71 4.50 2.26 gross 1000 3 ft specific heat (N 2 ,CO 2 , gross

of Air 000
scf 800 17.5 17.1 16.7 16.3 15.9 15.5 15.1 13.0 10.9 8.76 6.61 4.43 2.23 min weight/hr available 100
per Outlet 60 hr 1 % combustion 1
Input 700 15.2 14.8 14.4 14.0 13.6 13.2 12.8 10.7 8.63 6.51 4.36 2.19 1400 F. to air (a) of 400) heated.

Fuel 400 F scf min Btu/hr formulas: products being
of 600 8.50 6.41 4.30 2.16 1000 so (1400 stream
Btu 13.0 12.6 12.2 11.8 11.4 11.0 10.6 from wc T; conventional the 1.1 the
Gross 500 10.8 10.4 9.99 9.58 9.18 8.77 8.36 6.31 4.23 2.13 air of Btu gross air scf Q is: the of heats scfm to weight

Heating, scfm 1000 23.2 equation in specific 1000 and

Air 400 8.63 8.23 7.83 7.43 7.02 6.62 6.21 4.17 2.10 heat to Then air. heat considered the (b) give would volume
Direct-Fired 300 6.51 6.11 5.71 5.31 4.91 4.51 4.10 2.06 required Btu/scf specific the not refinements combustion, temperatures. thumb adds burned

for 200 4.43 4.04 3.64 3.24 2.84 2.43 2.03 gas natural gross 23.2 from many by formed higher of rule the being
Requirements 100 2.39 2.00 1.60 1.20 0.802 0.402 of amount read table, derived formula incorporates water the at change above, fuel The

Heat F the Find the From rise. above in products example the Reminder:

1 Air Temperature, conventional 1.1 table vaporization For required.
Table Inlet 20 0 20 40 60 80 100 200 300 400 500 600 700 800 900 1000 Example: Solution: The scfm The of combustion hr

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