Question

You have been asked to evaluate the economic implications of various methods for cooling condenser effluents from a​ 200-MW steamelectric plant. There are two basic types of cooling​ towers: wet and dry.​ Furthermore, heat may be removed from condenser water by​ (1) forcing​ (mechanically) air through the tower or​ (2) allowing heat transfer to occur by making use of natural draft.​ Consequently, there are four basic cooling tower designs that could be considered. Assuming that the cost of capital to the utility company is 10​%

per​ year, your job is to recommend the best alternative​ (i.e., the least expensive during the service​ life). Further, assume that each alternative is capable of satisfactorily removing waste heat from the condensers of a​ 200-MW power plant. What noneconomic factors can you identify that might also play a role in the​ decision-making process?

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Click the icon to view the alternatives description.

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Click the icon to view the interest and annuity table for discrete compounding when

iequals=1010​%

per year.

The AW of Wet​ Tower, Mechanical Draft is

​$negative 2,205,478−2,205,478.

​(Round to the nearest​ dollar.)The AW of Wet​ Tower, Natural Draft is

​$nothing.

​(Round to the nearest​ dollar.)

Ompuunuiry well - 10% The AW of Wet Tower, Mechanical Draft is $ - 2,205,478. (Round to the nearest dollar.) The AW of Wet Tower, Natural Draft is $ (Round to the nearest dollar.)

Answer 1

AW of wet tower mech draft = -3000000*(A/P,10%,30) - 40*2*74.6 * 24*365 *0.022 / 0.9 - 20*1.5*74.6*24*365*0.022 / 0.9 - 130000

= -3000000*0.1061 - 40*2*74.6 * 24*365 *0.022 / 0.9 - 20*1.5*74.6*24*365*0.022 / 0.9 - 130000

= -2205478.13 ~ -2205478

AW of wet tower natural draft = -8900000*(A/P,10%,30) - 20*1.5*74.6*24*365*0.022 / 0.9 - 100000

= -8900000*0.1061 - 20*1.5*74.6*24*365*0.022 / 0.9 - 100000

= -1523520.40 ~ -1523520

AW of dry tower mech draft = -5000000*(A/P,10%,30) - 20*2*74.6 * 24*365 *0.022 / 0.9 - 40*1.0*74.6*24*365*0.022 / 0.9 - 130000

= -5000000*0.1061 - 20*2*74.6 * 24*365 *0.022 / 0.9 - 40*1.0*74.6*24*365*0.022 / 0.9 - 130000

= -1938447.73 ~ -1938448

AW of dry tower natural draft = -9100000*(A/P,10%,30) - 40*1.0*74.6*24*365*0.022 / 0.9 - 100000

= -9100000*0.1061 - 40*1.0*74.6*24*365*0.022 / 0.9 - 100000

= -1704483.87 ~ -1704484

Annual cost of wet tower natural draft is lowest, it should be selected