# How to find Indicated mean effective pressure?

by falik
Tags: effective, pressure
 P: 6 1. The problem statement, all variables and given/known data A 4 stroke, single cylinder engine working on constant volume cycle, developes 7.5 KW brake power at 60 rev/sec the mechanical efficiency being 80%. The pressure at the begining of compression is 0.97 bar, the engine has a volumetric compression ratio of 7 and the maximum pressure reached in the cycle is 34 bar. If both compression and expansion is according to the law PV= costant where n=1.38, calculate Indicate Mean Effective Pressure ? 2. Relevant equations indicated power = Pm x Lx A x N 3. The attempt at a solution well i have tried different methods, but couldnt solve it, if anyone can help me with that ? ill b really gratefull. thanks.