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Using steam tables, determine the mean specific heat for superheated steam : (i) at 0.75 bar, between 100°C and 150°C ; (ii) at 0.5 bar, between 300°C and 400°C. |
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Answer» (i) At 0.75 bar. From steam tables ; At 100°C, hsup = 2679.4 kJ/kg At 150°C, hsup = 2778.2 kJ/kg ∴ 2778.2 = 2679.4 + cps (150 – 100) cps = \(\cfrac{2778.2-26794}{50}\) = 1.976. (ii) At 0.5 bar. From steam tables ; At 300°C, hsup = 3075.5 kJ/kg At 400°C, hsup = 3278.9 kJ/kg ∴ 3278.9 = 3075.5 + cps (400 – 300) cps = \(\cfrac{3278.9-30755}{100}\) = 2.034. |
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