What is deltaG for the throttling step in kJ/kg?
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What is deltaG for the throttling step in kJ/kg?
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- Argon (molar mass 40 kg/kmol) compresses reversibly in an adiabatic system from 5 bar, 25 °C to a volume of 0.2 m If the initial volume occupied was 0.9 m calculate the final pressure in bar to 2 decimal places.. Assume nitrogen to be a perfect gas and take cv 0.3122kJ/kgK. Question 12 of 84 A Moving to another questlon will save this response.3.21. The state of an ideal gas with Cp = (5/2)R is changed from P=1 bar and V = 12 m to P- 12 bar and V =1 m' by the following mechanically reversible processes: (a) Isothermal compression. (b) Adiabatic compression followed by cooling at constant pressure. atni (c) Adiabatic compression followed by cooling at constant volume.ro (d) Heating at constant volume followed by cooling at constant pressure. (e) Cooling at constant pressure followed by heating at constant volume. ad y Calculate Q. W, AU, and AH for each of these processes, and sketch the paths of all processes on a single PV diagram. owleA piston-cylinder device contains 3.2 kg of air initially at 300 kPa and 227 °C (State 1). The air is now expanded slowly in polytropic process during which PV1.2-constant (n=1.2) until the volume is doubled (State 2). Then the air expanded at constant pressure until the volume reached three times the volume of State 1 (State 3). Air properties: R = 287 J/kg.K, C₁ = 718 J/kg.K, and Cp = 1005 J/kg.K a) Calculate the total work done and the heat transfer in kJ. b) Draw the two processes on p-v diagram.
- A closed frictionless piston-cylinder device contains 0.365 kmol of an ideal gas known as Minesium (MW=38.0 g/mol, C, = 4R). The device undergoes a three-state, three process cycle. Initially the gas is at 205 °C and 350.0 kPa (State 1). It is isothermally compressed to a pressure of 550.0 kPa (State 2). From State 2, the pressure in the piston-cylinder device is reduced to 350.0 kPa via an isochoric process (State 3). Finally, the gas is expanded isobarically to the initial State 1 conditions. What is the work from State 1 to State 2, W12? kJ What is the work from State 2 to State 3, W23? kJ What is the work from State 3 to State 1, W31? kJ What is the total heat for this three step cycle, Qtot? kJ1. A steel flask of 0.04 m³ capacity is used to store Nitrogen at 120 bar and 20°C. The flask is protected against excessive pressure by a fusible plug which will melt and allow the gas to escape if the temperature is too high. A. How many kilogram of Nitrogen will the flask hold at the design conditions? B. At what temperature in °C must fusible plug melt in order to limit the pressure of flask to a maximum of 150 bar?A three-process cycle of an ideal gas, for which cp = 1.064 and cv = 0.804 kilojoules per kilogram per degree Kelvin , is initiated by an isentropic compression 1-2 from 103.4 kiloPascal , 27 degree Celsius to 608.1 kiloPascal. A constant volume process 2-3 and a polytropic process 3-1 with n = 1.2 completes the cycle. Circulation is a steady rate of 0.905 kilogram per second, compute for: Heat Added, QA Net Work done by the cycle, WN Cycle efficiency, e Mean Effective Pressure, PME
- A rigid, well-insulated tank contains air. A partition in the tank separates 12 ft^3 of air at 14.7 lbf/in2, 40◦F (left side of the tank) from 10 ft^3 of air at 50 lbf/in2, 200◦F(right side of the tank), as illustrated in the figure. The partition is removed and air from the two sides mix until a final equilibrium state is attained. The air can be modeled as an ideal gas, and kinetic and potential energy effects can be neglected. (Note: values for the left side of the tank are denoted with a subscript L, and values for the right side of the tank are denoted with a subscript R). a) Determine the final temperature (in F) b) Determine the final pressure (in lbf/in^2) c) Calculate the amount of entropy produced, in Btu/R d) Is this mixing process reversible or irreversible?An ideal gas contained in a piston-and-cylinder device undergoes a thermodynamic cycle made up of three quasi-equilibrium processes. Step 1-2: Adiabatic compression from 330 K and 9.35 atm to 12.58 atm Step 2-3: Isobaric cooling Step 3-1: Isothermal expansion c.) Calculate Q, W, ΔU and ΔH, in J/mole, for each step in the process and for the entire cycle. Assume that CP = (5/2) R. d.) Is this cycle a power cycle or a refrigeration cycle? Explain. Calculate the thermal efficiency or COP of the cycle, whichever is appropriate.-Thermodynamics- determine the properties of the saturated liquid at 10 bar. Locate the state on a T-S diagram.
- One cubic meter of oxygen at initial pressure of 1 bar and a temperature of17°C are compressed isentropically to a volume of 0.50m 3 . Use the specificheat at constant volume and pressure are 0.919 kJ/kgK and 0.659 kJ/kgK,respectively. Please answer the following a. The thermodynamic process the problem representsb. the pressure, temperature, and volume after the processc. change in internal energy, change in enthalpy and change in entropyd. work nonflow and heat transferredA cycle starts with an adiabatic compression of the air from state a with a volume V3 to state b with volume V1. At the end of the compression, heat is added (absorbed), resulting in an isobaric expansion to state c with volume V2 followed by an adiabatic expansion back to volume V3 at state d. Finally, heat is expelled, corresponding to an isochoric reduction completing the cycle and bringing air back to state a. Find the ratio between the initial and final temperatures for (1) the adiabatic compression, and (2) the adiabatic expansion in terms of the expansion ratio re = V3 /V2 and the compression ratio rc = V3 /V1..QUICKLY AND CORRECTLY PLEASE Two vessels A and B of different sizes are connected by a pipe with a valve. Vessel A contains 140 L of air at 3000 kPa, 90oC. Vessel B, of unknown volume, contains air at 70 kPa, 5oC. The valve is opened and, when the properties have been determined, it is found that pm = 1400 kPa, tm = 45oC. (a) What is the mass in kg of air initially inside vessel A (b) What is the volume of vessel B in liters?