You have been asked to evaluate the economic implications of various methods for cooling condenser effluents...

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?

	Alternative
	Wet Tower	Wet Tower	Dry Tower	Dry Tower
	Mech. Draft	Natural Draft	Mech. Draft	Natural Draft
Initial cost	$2.7 million	$8.8 million	$5.2 million	$8.8 million
Power for I.D. fans	40 200-hp I.D. fans	None	20 200-hp I.D. fans	None
Power for pumps	20 150-hp pumps	20 150-hp pumps	40 100-hp pumps	40 100-hp pumps
Mechanical maintenance/year	$0.12 million	$0.12 million	$0.15 million	$0.11 million
Service life	30 years	30 years	30 years	30 years
Market value	0	0	0	0

100

hp=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.

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Rahul Sunny answered 2 years ago

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You have been asked to evaluate the economic implications of various methods for cooling condenser effluents...

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