Answered: A point-focus concentrating solar…

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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Question

A point-focus concentrating solar collector comprising 490 heliostats and a central receiver atop a tall solar tower (see Figure 8.5) is operating under the following conditions:

• Beam solar radiation flux incident on the heliostat Ib,N = 830 W/m2

• Single heliostat surface area Ah = 120 m2

• Heliostat–receiver concentration ratio C = 520

• Optical efficiency of the heliostat–receiver system ηopt = 0.8

• Effective overall heat loss coefficient of the absorber/receiver Uc.e = 35 W/m2K

• HTF: molten salt

• HTF temperatures at the receiver inlet and outlet Tin = 333°C and Tout = 565°C

• Ambient temperature Ta = 36°C

• HTF specific heat c = 1.03 kJ/(kg K)

Calculate

• Total aperture area of the heliostat field

• Collector useful heat output rate

Central
геceiver
Hot fluid
Beam solar
radiation
Cold fluid
Solar
power
tower
Heliostat field
FIGURE 8.5 High-temperature concentrating solar collector comprising heliostat field and
central receiver on top of solar power tower.

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