As sketched in Fig. P4.78, a condenser using river water
Chapter 4, Problem 4.78(choose chapter or problem)
As sketched in Fig. P4.78, a condenser using river water to condense steam with a mass flow rate of \(2 \times 10^{5} \mathrm{~kg} / \mathrm{h}\) from saturated vapor to saturated liquid at a pressure of 0.1 bar is proposed for an industrial plant. Measurements indicate that several hundred meters upstream of the plant, the river has a volumetric flow rate of \(2 \times 10^{5} \mathrm{~m}^{3} / \mathrm{h}\) and a temperature of \(15^{\circ} \mathrm{C}\). For operation at steady state and ignoring changes in kinetic and potential energy, determine the river-water temperature rise, in \({ }^{\circ} \mathrm{C}\), downstream of the plant traceable to use of such a condenser, and comment.
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