Soal soal dibawah ini merupakan merupakan contoh penerapan dari konsep yang teah dijelaskan dalam pertemuan ke 4 dan 5, baik substansi materi yang tertuang dalam e learning termo maupun saat perkuliahan tatap muka di ruang kelas EXAMPLE E3-1 At the exit of a nozzle (see accompanying figure) a gas has the following properties: V1 = 95 m/s, mdot2 = 0.5 kg/min, Jdot2 = 0.0635 kW. If the nozzle exit diameter is 1 cm, determine (a) two thermodynamic properties at the exit, and (b) the flow rate of enthalpy. Neglect potential energy. [ Manual Solution] [TEST Solution] Answers: (a) 0.895 m 3 /kg, 3.11 kJ/kg, (b) 0.02 kW EXAMPLE E3-2 The specific volume of a gas in m 3 /kg is experimentally related to the independent properties temperature and pressure through the following functional relationship: = 4.157 T/p, where T and p are expressed in K and kPa respectively. Determine the change in , (a) exactly and (b) approximately using Taylor's theorem for the following change of state. State-1: p = 101 kPa, T = 1000 K; State-2: p=100 kPa, T = 1005 K. [Manual Solution] Answers: (a) 0.619m 3 /kg, (b) 0.615m 3 /kg EXAMPLE E3-3 A piston-cylinder device contains steam at a pressure of 1 MPa and a temperature of 300 o C. Evaluate (a) the difference between the left and right hand sides of the first T-ds equation if the system comes to a new equilibrium with its pressure decreasing by 1 kPa and temperature increasing by 1 o C. Use PC (Phase-Change) system state daemon. (b) What-if-scenario: How would the answer change if steam had velocities of 10 m/s and 100 m/s in the two states? [Manual Solution] [TEST Solution] Answers: (a) 5.3%, (b) 5.3% EXAMPLE E3-4 A block of aluminum of mass 5 kg, initially at equilibrium with the surroundings at 30 o C and 100 kPa, is placed in a pressurized chamber kept at a pressure of 10 MPa and a temperature of 200 o C. Determine the change in (a) the internal energy, (b) enthalpy, (c) entropy of the block after it
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Soal soal dibawah ini merupakan merupakan contoh penerapan dari konsep yang teah dijelaskan dalam
pertemuan ke 4 dan 5, baik substansi materi yang tertuang dalam e learning termo maupun saat
perkuliahan tatap muka di ruang kelas
EXAMPLE E3-1 At the exit of a nozzle (see accompanying
figure) a gas has the following properties: V1 = 95 m/s,
mdot2 = 0.5 kg/min, Jdot2 = 0.0635 kW. If the nozzle exit
diameter is 1 cm, determine (a) two thermodynamic
properties at the exit, and (b) the flow rate of enthalpy.