3. You have been asked to evaluate the economic implications of various methods for cooling condenser effluents from a 200-MW steam electric plant. In this regard, cooling ponds and once through cooling systems have been eliminated from consideration because of their adverse ecological effects. It has been decided to use cooling towers to dissipate waste heat to the atmosphere. 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 of natural draft. Consequently, there are four basic cooling tower designs that o considered. Assuming that the cost of capital to the utility company is 12% per y job is to recommend the best alternative (i.e., the least expensive during the se in view of the data in the table below. Further, assume that each alternative is satisfactorily removing waste heat from the condensers of a 200-MW power pla noneconomic factors can you identify that might also play a role in the decision-man process?
3. You have been asked to evaluate the economic implications of various methods for cooling condenser effluents from a 200-MW steam electric plant. In this regard, cooling ponds and once through cooling systems have been eliminated from consideration because of their adverse ecological effects. It has been decided to use cooling towers to dissipate waste heat to the atmosphere. 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 of natural draft. Consequently, there are four basic cooling tower designs that o considered. Assuming that the cost of capital to the utility company is 12% per y job is to recommend the best alternative (i.e., the least expensive during the se in view of the data in the table below. Further, assume that each alternative is satisfactorily removing waste heat from the condensers of a 200-MW power pla noneconomic factors can you identify that might also play a role in the decision-man process?
Chapter1: Making Economics Decisions
Section: Chapter Questions
Problem 1QTC
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Transcribed Image Text:3. You have been asked to evaluate the economic implications of various methods for
cooling condenser effluents from a 200-MW steam electric plant. In this regard, cooling
ponds and once through cooling systems have been eliminated from consideration
because of their adverse ecological effects. It has been decided to use cooling towers to
dissipate waste heat to the atmosphere. 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
of natural draft. Consequently, there are four basic cooling tower designs that o
considered. Assuming that the cost of capital to the utility company is 12% per y
job is to recommend the best alternative (i.e., the least expensive during the se
in view of the data in the table below. Further, assume that each alternative is d
satisfactorily removing waste heat from the condensers of a 200-MW power pla
noneconomic factors can you identify that might also play a role in the decision-man
process?
79
Alternative Types of Cooling Towers for a 200-Megawatt Fossil-Fired Power Plant
Operating at Full Capacity a
Alternative
Wet Tower
Wet Tower
Dry Tower
Mech. Draft
Dry Tower
Natural Draft
Mech. Draft
$3 million
40 200-hp
induced-draft fans
20 150-hp pumps
$0.15 million
Natural Draft
Initial cost
Power for I.D.
$8.7 million
$5.1 million
$9.0 million
None
20 200-hp I.D.
fans
None
fans
Power for pumps
Mechanical
maintenance/year
Service life
20 150-hp pumps 40 100-hp pumps 40 100-hp pumps
$0.17 million
$0.10 million
$0.12 million
30 years
30 years
30 years
30 years
Market value
a 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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