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In a steel spherical reactor with a heat transmission coefficient (10 + X) W / mK,...

In a steel spherical reactor with a heat transmission coefficient (10 + X) W / mK, water is boiled at 350 oC. The inner diameter of the tank is 80 cm and the wall thickness is (5+ (X / 2)) cm. This tank is insulated with (X) cm thick concrete (k = 2.5 W / mK).
Outdoor heat transfer coefficient (10+ (X)) W / m2K, indoor heat transfer coefficient is 500 W / m2K. Calculate both surface temperatures of the concrete insulation material and the amount of heat passing through the environment, since the outdoor temperature is (X) oC
X=11

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