MEC 309 Study Guide - Hessischer Rundfunk, Perfect Gas, Isentropic Process

• School: Ryerson University
• Department: Mechanical Engineering
• Course: MEC 309
• Professor: Wey H Leong

Document Summary

Max efficiency, n occurs for reversible power cycle n=k for isentropic process for perfect gas. Perfect gas = ideal gas with constant cp, cv and k. Assume perfect gas when monatomic gases or small t. Check for constant volume, pressure, temp, enthalpy, entropy. The ___ system is a closed system. The system consists of ___ and is modelled as ideal gas. Volume change is the only work mode. 1-d flow -the flow is normal to inlet/exit. Chapter 2 e = u + ke + pe = q - w. Get vf1,vg1,uf1,ug1 x vf2,vg2,uf2,ug2 nrg balance|| m=v/v p1v1=mrt1. If reversible cycle q = t(k) in efficiency equation. Qh is qin for power cycle wcycle = qh-qc. P(1-2) q12=0, w12 = -m(u2-u1) = -mcv(t2-t1) P(2-3) q23 = w23= mrth ln(v3/v2) = mrth ln(p2/p3) P(3-4) q34=0, w34 = -m(u4-u3) = -mcv(t4-t3) P(4-1) q41 = w41 = mrth ln(v4/v1) = mrth ln(p1/p4) For refrigeration cycle pg 264 (v4)(v2) = (v3)(v1)