Ew AaTf TC

c (elpw + c 1N(1 -£lw))-1 + N(2 + (f2 -1)/ N)-N)/egw ' '

where l and ejw are the long-wavelength emittances of the absorber plate and of the cover glasses, c1 = 0.05 and f2 = (1 + 0.089f1 - 0.1166f1 epUw) (1+ 0.07866N), (4.88)

with f1 inserted from (4.86) the units indicated (Duffie and Beckman, 1991). The relation replacing (4.85) is

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