1 2 points An ideal Otto cycle with a specified compression

1. (2 points) An ideal Otto cycle with a specified compression ratio could be executed using (a) air, (b) argon, and (c) ethane as the working fluid. The thermal efficiency will be the highest when ______ is used as the working fluid because_________. (Select the best response.)

a) air; that is why the “air standard assumptions” were formulated

b) argon; the ratio of specific heats is highest

c) ethane; it has the largest heating values (HHV and LHV)

d) The choice of working fluid would have no effect on the thermal efficiency of the cycle.

Solution

b) argon; the ratio of specific heats is highest.It has ratio of heat capacity =1.67