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Recitation_Wk_9

Recitation_Wk_9 - standard cycle a the compression ratio b...

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Recitation Week 10 Bullet Items. Air-standard cycle, ideal air-standard cycle, ideal, cold air-standard cycle Spark ignition engine, compression ratio Compression ignition engine, compression ratio and cutoff ratio Thermodynamic models (the best we can do) Otto cycle Diesel cycle Dual cycle Process paths on p-v and T-s diagrams Using p-v and T-s diagrams Ideal gas property variations along isentropic paths (lines) Recitation Problems 1. In an ideal Otto cycle, the temperature and pressure before compression are 300K and 1bar, respectively. The temperature is 700K after compression and 1400K after heat addition. Taking air to be an ideal gas with constant specific heats, find the followings for the air-
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Unformatted text preview: standard cycle. a. the compression ratio b. the compression work in kJ/kg c. the amount of heat addition during the heating process in kJ/kg d. the work done during expansion in kJ/kg e. the thermal efficiency 2. An air-standard cycle is executed in a closed system with 0.0015 kg of air and consists of the following three processes: 1-2: Isentropic compression from 100 kPa and 27 C to 1 MPa. 2-3: p = constant heat addition in the amount of 2.76 kJ. 3-1: p = c 1 v + c 2 heat rejection to initial state (c 1 and c 2 are constants). a. Show the cycle on p-v and T-s diagrams. b. Calculate the heat rejected. c. Determine the thermal efficiency....
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