Homework Assignment

#1. An engine modeled using the cold air-standard Otto cycle has a compression ratio of 9.   At the end of the power stroke (state 4) the air in the cylinder is at 1000 ^oR and 95 psi.  During the constant volume cooling process, 86 Btu/lb is removed by heat transfer.  Determine

1. the temperature and pressure at each state (1,2,&3) in the cycle
2. the net work in Btu/lb
3. the heat addition in Btu/lb
4. the thermal efficiency
5. the mean effective pressure in psi

#2. Repeat problem #1 on an air-standard basis and compare the results to those obtained in problem #1.

#3.  Air at 300^oK and 101 kPa (state 1) is compressed in an engine modeled using the cold air-standard Otto cycle. The engine has a compression ratio of 10 and a pressure ratio of 3.0. Determine:

1. the temperature and pressure at each state (2,3&4) in the cycle
2. the net work in Btu/lb
3. the heat addition in Btu/lb
4. the thermal efficiency
5. the mean effective pressure in psi

Additional Material

Worked out examples (tutorials).

See if you can find the mistake in my movie. :) The efficiency of the cold air-standard Otto cycle is

• Otto Cycle
  • Cold Air Standard Analysis
  • Air Standard Analysis
  • Comparison of methods

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