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ADVANCED THERMODYNAMICS ENGINEERING phần 9

Là có bất kỳ dữ liệu ngẫu nhiên được tạo ra trong quá trình? Nếu vậy, làm thế nào cho đơn vị khối lượng? d) Thảo luận về các lĩnh vực theo quy trình 1-2 trong sơ đồ Pv và Ts. Vấn đề C69 10 kg của Ar được chứa trong các phần piston xi-lanh của một hệ thống nhà nước (1,0135 thanh, 100 º C). | c Is there any entropy generated during the process If so how much for unit mass d Comment on the areas under process 1-2 in the P-v and T-s diagrams. Problem C69 10 kg of Ar is contained in the piston-cylinder section A of a system at the state 1.0135 bar 100 C . The gas is in contact through a rigidly fixed diathermal wall with a piston-cylinder section B of the system that contains a wet mixture of water with a quality x 0.5 that is constrained by a weight. As the gas in section A is compressed the temperature in A remains at 100 C using QE process due to contact with section B. Assume that the quality in section B increases to 90 . Both systems are well insulated except at the diathermal wall. Determine a the initial pressure in Chamber B b the heat transfer Q12 B in kJ to Chamber B during compression of Ar in Chamber A c the work for sections A and B in kJ d the change in the entropies of Ar and H2O both liquid and vapor and e the volume V2 in Chamber A f Is the process for the composite system A B combined together isothermal and isentropic Problem C70 A piston-cylinder assembly contains Ar g at 60 bar and 1543 K state 1 . a Determine the work done if the gas undergoes isothermal expansion to 1 bar state 2 . What is the heat transfer Does this work process violate the Second Law b Determine the work done if the gas undergoes quasistatic adiabatic expansion to 1 bar state 3 . Can we continue the expansion to v3 rc by removing the insulation and adding heat Problem C71 A rigid container of volume V is divided into two rigid subsystems A and B by a rigid partition covered with insulation. Both subsystems are at the same initial pressure Po. Subsystem B contains 4 kg of air at 350 K while subsystem A contains 0.4 kg of air at 290 K. The insulation is suddenly removed and A and B are allowed to reach thermal equilibrium. a What is the behavior of the overall entropy with respect to the temperature in subsystem A. What is the equilibrium temperature b As heat is .