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A natural gas-fired electric power plant has an efficiency of 27 percent with 20

ID: 761724 • Letter: A

Question

A natural gas-fired electric power plant has an efficiency of 27 percent with 20 percent waste heat being released to the atmosphere as stack heat and the other 80% taken away in cooling water drawn from a nearby river (used to cool and condense down the hot steam exiting the generator turbines). To eliminate heating the bodies of water surrounding the power plant, the evaporation of the coolant water is what cools the steam; the water vapor generated by this evaporation is released to the atmosphere. Thus, the amount of heat dissipated will be proportional to the amount of water evaporated and the latent heat of vaporization. If the cooling water (marked

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