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+//Problem 15.02:

+

+//initializing the variables:

+

+//calculation:

+//The first step is to convert the equipment, installation, and operating costs to total\ncosts by multiplying each by the total gas flow, 100,000 acfm. Hence, for the finned exchanger,

+//the total costs are

+Equipmentcost = 100000*3.1 // in $

+Installationcost = 100000*0.80 // in $

+Operatingcost = 100000*0.06 // in $

+//Note that the operating costs are on an annualized basis. The equipment cost and the installation\ncost must then be converted to an annual basis using the CRF. From Equation (15.3)

+CRF = (0.1)*(1+0.1)^20/[(1+0.1)^20 - 1]

+//The annual costs for the equipment and the installation is given by the product of the CRF and\nthe total costs of each:

+Equipmentannualcost = 0.11746*Equipmentcost

+Installationannualcost = 0.11746*Installationcost

+//The calculations for the 4-pass and the 2-pass exchangers are performed in the same manner.\nThe three preheaters can be compared after all the annual costs are added. The tabulated results\nare provided in Table 15.5. 

+// total annual costs

+CF = 65000

+C4 = 77385

+C2 = 60111

+

+printf("\n\nResult\n\n")

+printf("\n According to the analysis, Total Annual Costs for Finned exchanger = $%.0f, for 4-Pass Exchanger = $%.0f and for 2-Pass Exchanger = $%.0f.\nTherefore 2-pass exchanger is the most economically attractive device since the annual cost is the lowest.",CF,C4,C2)