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Revenue at 5d. | | | | | | per 1000 cub. ft.| 22,126 | 43,522 | 64,282 | 84,426 | 103,971 | (average) | | | | | | Profit |12.18 p.ct.|20.06 p.ct.|23.54 p.ct.|25.22 p.ct.|26.16 p.ct.| |= 10,046 | = 25,014 | = 39,338 | = 52,837 | = 65,875 | ------------------------------------------------------------
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TABLE II.—Cost of Air Power in Terms of Indicated Horse Power.
Abbreviated column headings:
Qty. Air: Quantity of Air at 45 lbs.
Pressure required per Ind. H.P. per
Hour.
Cost/Hr.: Cost per Hour at 5d. per 1000 Cubic Feet.
Cost/Hr. w/rebate: Cost per Hour with Rebate
when Profits reach 26 per
Cent.
Cost/Yr.: Cost per Annum (2700 Hours) at 5d. per 1000 Cubic Feet.
Cost/Yr. w/rebate: Cost per Annum with Rebate
when Profits reach 26 per
Cent.
Abbreviated row headings:
CASE 1.—Where air at 45 lbs. pressure is re-heated to 320 deg. Fahr., and expanded to atmospheric pressure.
CASE 2.—Where air at 45 lbs. pressure is heated by boiling water to 212 deg. Fahr., and expanded to atmospheric pressure.
CASE 3.—Where air is used expansively without re-heating, whereby intensely cold air is exhausted, and may be used for ice making, &c.
CASE 4.—Where air is heated to 212 deg. Fahr., and the terminal pressure is 11.3 lbs. above that of the atmosphere
CASE 5.—Where the air is used without heating, and cut off at one-third of the stroke, as in ordinary slide-valve engines
CASE 6.—Where the air is used without re-heating and without expansion.
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______________ | Qty. Air | Cost/Hr. | Cost/Hr. | Cost/Yr. | Cost/Yr. | | | | w/rebate | | w/rebate | | Cub. Ft. | d. | d. | L s. d. | L s. d.| ------------------------------------------------------------
--------- CASE 1 | 125.4 | 0.627 | 0.596 | 7 1 1 | 6 14 01/2| CASE 2 | 140.4 | 0.702 | 0.667 | 7 17 11 | 7 10 0 | CASE 3 | 178.2 | 0.891 | 0.847 | 10 0 51/2 | 9 10 51/2| CASE 4 | 170.2 | 0.851 | 0.809 | 9 11 51/2 | 9 1 101/2| CASE 5 | 258.0 | 1.290 | 1.226 | 14 10 3 | 13 15 9 |
