Problem 13-7Dee, Leogo, Lu, MendozaPROBLEMA central receiver
solar thermal power plant with storage has 1000 heliostats that
have 60m2 of reflective surface each. The transmission efficiency
between incidence and the receiver is 25%. The steam power plant
efficiency is 30%, both considered constant during the day. Assume
that the solar incidence in June follows a sine curve beginning
with zero at -6h before solar noon, and ending with zero at +6h
after solar noon, with a peak of 1 kW/m2. The plant operates
between -5.5h and +5.5h around solar noon. During that period the
end use power profile is constant at 2.5 MW.GIVENA central receiver
solar thermal power plant1000 heliostats A = 60m2 ea. ir = 25% pp =
30% Solar incidence sine curve beginning with zero at -6h before
solar noon, and ending with zero at +6h after solar noon, Peak = 1
kW/m2. The plant operates : -5.5h and +5.5h around solar noon. Pend
= 2.5 MWFINDPeak powerplant output (MW)Powerplant output at startup
(MW)Total energy output during the operation (MWhr)Total equivalent
electric energy going into storage (MWhr)Time end use stops
withdrawing from storage and energy input to storage begins (hours
before solar noon)Solution (a)
1.353 kW/m2 Solution (a) Solution (b)Solution (c)Solution
(d)Total Electric Energy Stored= Energy Output Energy Used= 46.115
2.5(11) = 18.615 MWh
