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Solar radiation heats the surface after sunrise, and the resulting heat flux F to the atmosphere is
approximated by
2n(t- troon)
F = F.
6 a.m. < t< 6 p.m.
тax Cos
At
where Fmax= 300 W m² is the maximum flux at tnoon = 12 p.m., and At = 24 hours. At what time
of day will the town finally be ventilated?

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