Intermediate Thermodynamics Questions & Answers  




You should take into consideration kinetic energy (flow speed) when it's possible to do so. Thus, if there is enough information to determine velocity of the gas, then take into account kinetic energy. Otherwise, there is no choice but to neglect it.




As much as possible try to set things up so that the system is at steadystate — this will simplify things. Thus, when solving a problem choose the reference frame of the control volume such that the properties don't vary in time anywhere within that volume.




These problems are easier than those I gave answers to. You should be able to get the right answer on your own. There are no answers when solving new engineering problems in industry: it's good to start practicing for these situations now.




But $v_c \neq v_c^\prime$: $$ v_c = \frac{Z_c R T_c}{P_c} $$ and $$ v_c^\prime \equiv \frac{R T_c}{P_c} $$



$\pi$ 