25. A solar-power-tower plant is considered for a given city with a DNI = 2072 kWh/m2.year. Heliostats with a total area of 80,000 m² are to be used to reflect solar radiation into a receiver. When the average solar irradiation is 950 (W/m), steam is produced at a rate of 20 kg/s. The resulting steam is directed to a turbine to produce mechanical power. A generator is connected to turbine to convert turbine shaft power into electricity. Assume the collector-receiver conversion is 85 percent efficient; take the average thermal efficiency to be 18 percent, and the generator efficiency to be 96 percent. (a) How much electricity can be produced per year? What is the temperature of the produced steam if the fluid initial temperature is 25'C, and the specific heat capacity is 4.2 kJ/kg."C?

25. A solar-power-tower plant is considered for a given city with a DNI = 2072 kWh/m2.year. Heliostats with a total area of 80,000 m² are to be used to reflect solar radiation into a receiver. When the average solar irradiation is 950 (W/m), steam is produced at a rate of 20 kg/s. The resulting steam is directed to a turbine to produce mechanical power. A generator is connected to turbine to convert turbine shaft power into electricity. Assume the collector-receiver conversion is 85 percent efficient; take the average thermal efficiency to be 18 percent, and the generator efficiency to be 96 percent. (a) How much electricity can be produced per year? What is the temperature of the produced steam if the fluid initial temperature is 25'C, and the specific heat capacity is 4.2 kJ/kg."C?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.

Question

25. A solar-power-tower plant is considered for a given city
with a DNI = 2072 kWh/m2.year. Heliostats with a total
area of 80,000 m² are to be used to reflect solar radiation
into a receiver. When the average solar irradiation is 950
(W/m), steam is produced at a rate of 20 kg/s. The
resulting steam is directed to a turbine to produce
mechanical power. A generator is connected to turbine to
convert turbine shaft power into electricity. Assume the
collector-receiver conversion is 85 percent efficient; take
the average thermal efficiency to be 18 percent, and the
generator efficiency to be 96 percent.
(a) How much electricity can be produced per year?
What is the temperature of the produced steam if
the fluid initial temperature is 25°C, and the specific
heat capacity is 4.2 kJ/kg."C?

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