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COST COMPARISON <br />Higher capital cost of Alternate "A" <br />over Alternate "B " ---------------- $19,726.00 <br />ANNUAL COST OF ALTERNATE "A" FOR <br />ADDITIONAL INVESTED MONEY: AND <br />ELECTNIM POWER: <br />Assume lost. of interest of invested <br />funds 5% per annum on $ 19,726.00 -------------- ------- $ <br />(H.P. in winter = 80% of 10 =.8 H.P. for <br />five months = .8 x5 - 40 H.P. months in <br />spring, fall, and summer =.30% of 10 = <br />3 x7 = 21 H.P. months) <br />61 H.P. months <br />K.W.H.'s = (61) (.746) (2.4) (30).= . <br />32,600 <br />986.00 <br />Annual Power ' Cost.@. 14/ K .W.H.----------------- --- --- --- 326.00 <br />TOTAL ANNUAL COST $ 1,306.00 <br />ANNUAL COST OF ALTERNATE "B" FOR <br />ELECT" fG; POWER <br />50 H.P. running. continuously K.W.H.'s = <br />(50) (.346) (24) (365) = ,325,000 <br />Annual Power Cost @ 1 <2/ K.W.H.-------- ----- --- --------- $ 3,250.00 <br />Annual Savings by Selecting Alternate "A" <br />Aero - Hydraulic by Carter Company------------- - - - - - -- $ 1,944.00 <br />Comments & Rdcommendations <br />Alternate "A" <br />Telephone calls were made to verify the Carter principle, <br />the conclusions being that the piston bubble is as ciaimedr; and rela- <br />tively trouble free. The equipment is of superior construction and <br />design and has a factor':' of reliability of 4:1 on the compressors <br />and 6:1 on the gas system over "Pearth" by P.F.T. <br />We recommend the "Carter: aero- hydraulic system as being <br />a satisfactory system of superior construction, reliability, less <br />maintainence and much cheaper to operate. The difference in initial <br />capital cost is more than justified. <br />