Explanation Write the expression to obtain the mass flow rate ( m ˙ M mix ) . m ˙ M mix = V ˙ p 1 R ¯ T 1 (I) Here, volumetric flow rate is V ˙ , pressure is p 1 , gas constant is R ¯ and temperature is T 1 . Write the expression to obtain the power developed at steady state ( W ˙ CV ) . W ˙ CV = m ˙ M mix { y CO 2 ( h ¯ 1 , CO 2 − h ¯ 2 , CO 2 ) + y H 2 O ( h ¯ 1 , H 2 O − h ¯ 2 , H 2 O ) + y N 2 ( h ¯ 1 , N 2 − h ¯ 2 , N 2 ) } (II) Here, mole fraction of CO 2 is y CO 2 , mole fraction of H 2 O is y H 2 O , mole fraction of N 2 is y N 2 , enthalpy of CO 2 at 720 K is h ¯ 1 , CO 2 , enthalpy of CO 2 at 380 K is h ¯ 2 , CO 2 , enthalpy of H 2 O at 720 K is h ¯ 1 , H 2 O , enthalpy of H 2 O at 380 K is h ¯ 2 , H 2 O , enthalpy of N 2 at 720 K is h ¯ 1 , N 2 and enthalpy of N 2 at 380 K is h ¯ 2 , N 2 . Conclusion: Refer Table A-23, “Ideal gas properties of selected gases”, obtain the enthalpy of CO 2 , H 2 O and N 2 at 720 K temperature as 28 , 121 kJ / kmol , 24 , 840 kJ / kmol and 21 , 220 kJ / kmol respectively. Refer Table A-23, “Ideal gas properties of selected gases”, obtain the enthalpy of CO 2 , H 2 O and N 2 at 380 K temperature as 12 , 522 kJ / kmol , 12 , 672 kJ / kmol and 11 , 055 kJ / kmol respectively

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ISBN: 2818440116926

Author: MORAN

Publisher: WILEY CONS

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Chapter 12.9, Problem 18P

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The power developed at steady state.

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