INDICATED POWER OF A COMPRESSOR

where A = area of the cylinder, m²

L = length of stroke, m

N = rpm of compressor crank

p_m = mean effective pressure of air, P_a (N/m²)

Theoretically, m.e.p. for a single-acting, single-stage compressor is,

where η_v = volumetric efficiency of compressor

Using indicator card, the m.e.p. is: