Bar state

A Braysson cycle (Fig. 4.32) uses air as the working fluid with 1 kg/ sec of mass flow rate through the cycle. In the Brayton cycle, air enters from the atmospheric source to a compressor at 20°C and 1 bar (state 1) and leaves at 8 bars (state 2) air enters an isobaric heater (combustion chamber) and leaves at 1100°C (state 3) and air enters a high-pressure turbine and... 

A Braysson cycle (Fig. 4.32) uses air as the working fluid with 1 kg/sec mass flow rate through the cycle. In the Brayton cycle, air enters from the atmospheric source to a compressor at 20° C and 1 bar (state 1) and leaves at 8 bars (state 2) air enters an isobaric heater (combustion chamber) and leaves at 1100°C (state 3) air enters a high-pressure isentropic turbine and leaves at 1 bar (state 4). In the Ericsson cycle, air enters a low-pressure isentropic turbine and leaves at 0.04 bar (state 5) air enters a first-stage compressor and leaves at 0.2 bar (state 6) air enters an isobaric intercooler and leaves at 20°C (state 7) air enters a second-stage compressor and leaves at 1 bar (state 8) and air is discharged to the atmospheric sink. Assume all compressors have 85% efficiency. 

A system formed of methane( 1) and a hght oil(2) at 200 K and 30 bar consists of a vapor plrase containing 95 mol-% methane and a hquid phase containing oil and dissolved metlrane. The fugacity of the methane is given by Henry s law, and at the temperature of interest Henry s constant is Hi = 200 bar. Stating any assumptions, estimate the equilibrium mole fraction of methane in the liquid phase. The second virial coefficient of pure metlrane at 200 K is —105 cm mol . ... 

Example 2.32. A drunkard, the system, is living in a small town with four bars, states Sj = i, i = 1,. .., 4. As time goes by, the dmnkard jumps from one bar to the other according to the following one-step transition matrix. As seen, the probabilities of moving from one bar to the other are equal also, the drunkard eventually leaves the bar to the next one, i.e. pii = 0. 

The above treatment is equivalent to stating that x,) = v,) x,) and ) = vf) ) where barred states have one less vibrational degree of freedom. If we factor out the vibrational state, we then have... 

Problem 4.20 A Carnot cycle operates in a closed system using steam saturated liquid at 20 bar (state A) is heated isothermally until it becomes saturated vapor (state B), expanded by reversible adiabatic process to 10 bar (state C), partially condensed to state D, and finally compressed by reversible adiabatic process to initial state A. 

Problem 6.25 A flow process utilizes steam as the working fluid. The steam, initially at 30 bar and 700 °C (state A), is cooled under constant pressure to a temperature of 380 °C (state B) and it subsequently expands adiabatically to a final pressure of 1 bar (state C) through a turbine whose efficiency is 75%. 

Fig. 5. (a) Switch with BAR state (b) Optical field propagation for BAR state (3D view)... 

Observation no Electrodes dimension (pm) Length of the electrode (pm) Voltage for bar state(V) Voltage for cross state(V)... 

Assume that the excess molar volme remains essentially constant to 500 0 and 3000 bars. State explicitly any other assumptions that you must make in order to complete this calculation. 

You wish to determine the fugacity of water at 300°C and 300 bar. Using only data for saturated steam and superheated vapor from the steam tables, determine, as accurately as you can, the fugacity of water at 300°C and 300 bar. State any assumptions that you make. 

Determine the fugacity of pure water at 25°C and 500 bar. State any assumptions that you make. 

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