A boiler operates at steady state. The entering water is saturated liquid at P = 5 bar and has a flow rate of 10,000 kg/hr. The exiting steam is also at P = 5 bar and has T = 400°C. The pipe entering the boiler is 8 cm in diameter, and the pipe leaving the boiler is 30 cm in diameter (Figure 3-7). What is the rate at which heat is added in the boiler?

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P = 5 bar min = 10,000 kg/hr a Saturated liquid Boiler m D = 30 cm P out = 5 bar = 400°C Tout D = 8 cm FIGURE 3-7 A boiler operating at steady state, as described in Figure 3-5.