Consider a concentrating thermal collector in the form of a parabolic trough which is 25 m long with a 2 m-wide aperture. The collector pipe is made of a material with overall heat transfer coefficient h = 20 W m^-2 K^-1, has diameter is 10 cm, and can be assumed to have walls of negligible thickness. At the collector location, a solar irradiation of G = 920 W m^-2 is measured, with an ambient temperature of 25 C.

If the optical efficiency is given as _ar = 0.83 and the overall efficiency _c = 0.62, what is the temperature of the collector pipe in C? Give only the numerical part of your answer, to 3 significant figures.