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 • Efficiency of the collector • Mass flow rate of the HTF
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
• Efficiency of the collector
• Mass flow rate of the HTF
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