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Unformatted text preview: 1 Meeting 21, Sections 91 –95 Announcements • Exam 2. Monday July 25th, 10 – 12. ZACH 104B • Group project. Due Friday July 22rd at 10. • We now begin Chapter 9. Everything we have developed is going to be used. 2 Final Recommendations for Group Project • Check units on heat transfer rate. • Do not include spatial relations when introducing tables and figures. • Include Individual Effort Ratings. • Points will be deducted for each occurrence of an infraction. • Use the Ideal Gas Law to get the specific volume of air. • A few examples of perfect Individual Projects are available on elearning. 3 What we covered Monday • Ideal work vs. real work. • Determining ideal work. • Determining real work. (Isentropic efficiency). • Entropy Balance for control volumes. 4 Topics for Today • Gas power cycles. • Carnot cycle. • IC engine terminology. • Otto cycle. • Diesel cycle. (Time permitting). 5 6 First Cycle we will look at: Carnot Cycle 1. Reversible isothermal expansion 2. Reversible adiabatic expansion 3. Reversible isothermal compression 4. Reversible adiabatic compression •. Introduced in Section 6−8. •. Review question: what is another term for a reversible, adiabatic process? 7 Carnot cycle in closed system 8 Carnot Cycle in open system • In an open system, Fig 97 9 Carnot Cycle Carnot Cycle as it appears both on a pv diagram and a Ts diagram. Note that on a Ts diagram, the Carnot Cycle is a rectangle: isotherms are horizontal and isentropes are vertical. Example • Consider a Carnot Cycle executed in a closed system with 0.6 kg of air. The temperature limits of the cycle are 300 and 1100 K, and the minimum and maximum pressures that occur during the cycle are 20 and 3000 kPa. Assuming constant specific heats, determine the new work output per cycle....
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 Summer '07
 RAMUSSEN
 Thermodynamics, Heat Transfer, Cycle, Internal combustion engine, Diesel engine, Adiabatic process, Carnot cycle

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