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Question: You have been asked to evaluate the economic implications of various methods for cooling condense......

Question: You have been asked to evaluate the economic implications of various methods for cooling condense...

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 15​% 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?

Wet Tower Mech. Draft Wet Tower Natural Draft Dry Tower Mech. Draft Dry Tower Natural Draft
Initial Cost $2.7 million $8.7 million $4.9 million $9.0 million
Power for I.D. fans 40 200-hp I.D. fans None 20 200-hp I.D. fans None
Mechanical maintnance/year $0.16 million $0.10 million $0.12 million $0.12 million
Service Life 30 years 30 Years 30 Years 30 Years
Market Value 0 0 0 0
Power for pumps 20 150-hp pumps 20 150-hp pumps 40 100-hp pumps 40 100-hp pumps

100 hpequals=74.6 ​kW; cost of power to plant is 2.2 cents per kWh or​ kilowatt-hour; induced-draft fans and pumps operate around the clock for 365​ days/year (continuously). Assume that electric motors for pumps and fans are​ 90% efficient.

*The AW of Wet​ Tower, Mechanical Draft is ​$-2,328,388. ​(Round to the nearest​ dollar.)

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

*The AW of Dry​ Tower, Mechanical Draft is $____________​(Round to the nearest​ dollar.)

*The AW of Dry​ Tower, Natural Draft is ​$______________​(Round to the nearest​ dollar.)

*What is the best​ alternative? Choose the correct answer below.

A. Wet​ Tower, Natural Draft

B. Dry​ Tower, Mechanical Draft

C. Wet​ Tower, Mechanical Draft

D. Dry​ Tower, Natural Draft

*Should such​ non-economic factors as operating issues and licensing be taken into​ consideration?

Yes or No

Solutions

Expert Solution

Rahul Sunny answered 2 years ago
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