METEO 300 Lecture Notes - Lecture 27: Polytropic Process, Isentropic Process, Thermodynamic Process
Document Summary
Me 300 - lecture 27 - isentropic relations for ideal gases. Polytropic: thermodynamic process that obeys the relation = constant. When is substituted for a value, it represents different processes. Consider 0. 3 kg of n2 in a rigid container at 400 k and 5 atm. The n2 is cooled to 300 k. determine the entropy change of the n2 associated with the cooling process. Since the process is isochoric (rigid container), we can use this form of the entropy relations: We are left with the following as our relation: The ratio of 22 = 1 because 2 =1 and the ln 1 = 0. The of n2 is 1000 jkg k , the molecular weight is 28 , and is 8. 314. Consider a reversible, ideal gas cycle, consisting of four processes: an isobaric heat addition, an isentropic expansion, and isothermal heat removal, and finally an isochoric heat addition. Sketch this cycle on a p-v and t-s diagram.
