Estimate the inside and outside wall temperatures

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Reference no: EM131147853

A proposed design for a nuclear power plant uses molten lead to remove heat from the reactor core. The heated lead is then used to boil water that drives a steam turbine. Water at 5 atm pressure (T_sat = 152?C) enters a heated section of a pipe at 60?C with a mass flow rate of m? = 2 kg/s.

The pipe is stainless steel (k_s = 15 W/m·K) with a wall thickness of 12 mm and an outside diameter of 6.2 cm. The outside surface of the pipe is surrounded by an almost-stationary pool of molten lead at 477?C.

a. At point where the liquid water has a bulk temperature of T_b = 80?C, estimate the inside and outside wall temperatures of the pipe, T_wi and T_wo , to within about 5?C. Neglect entry length and variable properties effects and take β ≈ 0.000118 K^-1 for lead.

Hint: Guess an outside wall temperature above 370?C when computing h for the lead.

b. At what distance from the inlet will the inside wall of the pipe reach T_sat? What redesign may be needed?

Reference no: EM131147853

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