Explanation Write the expression for effectiveness of regenerator. η reg = h x − h 2 h 4 − h 2 h x = ( η reg ) ( h 4 − h 2 ) + h 2 (I) Here, enthalpy at state x is h x , effectiveness of regenerator is η reg , enthalpy at state 2 is h 2 and enthalpy at state 4 is h 4 . Write the expression for thermal efficiency. η = ( h 3 − h 4 ) − ( h 2 − h 1 ) ( h 3 − h x ) (II) Here, thermal efficiency is η , enthalpy at state 1 is h 1 , enthalpy at state 3 is h 3 . Conclusion: Refer to Table A-22 “Ideal gas properties of air” to obtain enthalpy ( h 1 ) as 300.19 kJ/kg at sate 1, enthalpy ( h 2 ) as 579.9 kJ/kg at state 2, enthalpy ( h 3 ) as 1515.4 kJ/kg at state 3 and enthalpy ( h 4 ) as 808.5 kJ/kg at state 4. Substitute 808.5 kJ/kg for h 4 and 579.9 kJ/kg for h 2 in Equation (I). h x = ( η reg ) ( 808

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Chapter 9.14, Problem 16CU

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The suitable term in the blank of the sentence “The effectiveness of regenerator if thermal efficiency is 55% instead of 56.8%, the corresponding regenerator effectiveness, keeping h1, h2, h3, and h4s the same, is then __________”.

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Chapter 9.14, Problem 15CU

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The suitable term in the blank of the sentence “The effectiveness of regenerator if thermal efficiency is 55 % instead of 56.8 % , the corresponding regenerator effectiveness, keeping h 1 , h 2 , h 3 , and h 4 s the same, is then __________”.

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The suitable term in the blank of the sentence “The effectiveness of regenerator if thermal efficiency is 55% instead of 56.8%, the corresponding regenerator effectiveness, keeping h1, h2, h3, and h4s the same, is then __________”.

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