A solar-thermal plant is used to produce power. A molten salt transfers heat to a non-ideal Rankine cycle to produce electricity from a turbine. The molten salt has an average temperature of 800 oC when transferring heat to the boiler in the Rankine cycle. The condenser for the power cycle exchanges heats with water in a river that is at 20 oC. The steam flow rate through the cycle is 10 kg/s. The inlet of the boiler is at 9 MPa absolute and steam leaves the boiler at 9 MPa absolute and 600 oC. The exit of the turbine operates is at 20 kPa absolute and has a quality of 95%. The exit of the condenser is at 20 kPa absolute and is a saturated liquid.

Draw a diagram of the Rankine cycle. Include all the unit operations (pieces of equipment). Show the direction of flow and where heat and work enters and leaves the cycle. Number the streams in the cycle. State proper assumptions.

1. What is the power consumption for the pump (in MW), the power produced by the turbine (in MW), the thermal efficiency of the cycle?

2. What is the maximum thermal efficiency that a heat engine can have operating between the temperatures of the heat source molten salt and heat sink river? Why should the efficiency calculated would be less than this maximum? List at least four places in the cycle that contribute to the real plant having a lower thermal efficiency than the maximum.

A piston-cylinder device initially has a volume of 1.5 m3 containing steam at 300 kPa absolute and 150 oC. It is then heated so it expands at constant pressure until it reaches a temperature of 400 oC.

Draw a diagram of the device showing system boundary and flows of energy. What boundary work is done by the cylinder, in kJ, during the expansion? State your assumptions.

1. What is the mass of steam in the piston-cylinder?

2. How much heat is added to the cylinder, in kJ, during the expansion? State your assumptions.

3. Assuming there are no irreversibilities during the expansion; S.GEN=0, does the entropy of the steam decrease, remain constant, or increase during the expansion? Explain your answer.

• Find a word, number or name.The only restrictions are that it must have at least four characters, and must include at least one horizontal, vertical, angled, and curved segment each  [ example: LOVE ].
• Find parameterizations for the each characters in your word, in the xy-plane. At any time the "plotter" can only be at one location and hence the different curves making up your characters must utilize distinct time intervals!
• If F(x,y) = (xy²) i + (x²y) j is the force field acting on the plotter tip as it traces out your characters, calculate the total work done in plotting your word
• Draw typical velocity and acceleration vectors at various points along the curves of each character (on print-out).
• Calculate and graph the speed (as a function of time) along each character.
• Calculate and graph the Normal and Tangential component of the acceleration vectors (as a function of time), at least 2 locations on each character.
• Calculate and graph the curvature (as a function of time) along each character.

Does systematic error vary during repeated readings? What is the relationship between systematic error and the sample size?

• Find a word, number or name.The only restrictions are that it must have at least four characters, and must include at least one horizontal, vertical, angled, and curved segment each  [ example: LOVE ].
• Find parameterizations for the each characters in your word, in the xy-plane. At any time the "plotter" can only be at one location and hence the different curves making up your characters must utilize distinct time intervals!

What is the difference between SMC-R50 composite and fabric reinforced composites?

I know SMC uses random fiber orientation, is there a random fiber fabric?

Thanks

If a golf ball were dropped from a significant height and the force of Drag is modeled by Fd=0.0057*V-0.0106, where V is the velocity in m/s the Fd is the force of drag in N. The mass of the golf ball is 0.0455 Kg.

h. How high will the golf ball bounce after the 5th impact with the concrete surface ignore drag force?

i. If drag was included for G and H what type of analysis technique would be needed

Water is discharged from a pipe outlet at a rate of 60l/s at 120.8 kPa absolute pressure. All pipes are 15 cm in diameter with a total length of 200 m. The total pipe length on the suction side is 10.8 m. Both reservoirs are big. The water surfaces are exposed to the atmosphere and the difference in their levels is 9 m.

Pipeline friction head loss is 0.086 m per meter length of pipe. On the suction side, fitting loss is 1.3 m while on the delivery side, fitting loss varies with the square of the velocity with K = 1.0.

a) Find the height of the water level above the pipe outlet in the receiving reservoir (m).

b) Find the total head loss of the system (m).

c) What is the hydraulic power (kW)?

d) The water to be pumped has a vapour pressure of 2335 N/m². The cavitation parameter, s = 0.12. Find the maximum pump height possible above the surface of the water in the supply reservoir (Show clearly the calculation of all heads involved).]

(Atmospheric pressure = 101.3 kPa).

The stream function ?? in a two-dimensional flow field is given as ?? = 4?? − 3?? + 7???? (a) Prove that this flow field is irrotational and that it satisfies the continuity equation. (b) Find the potential flow function Ф(??, ??) for this flow field with boundary condition Ф = 0 at x = 2, y = 1.

Why are the tolerance characteristics categorized as forced
fitting and loose can't represent shape and position tolerance?

1. Control charts are usually expressed in terms of average values ​​and their dispersion.
Give an explanation (and the reason) about the condition of a production system that is
stated in the control chart

2. From the results of the control chart analysis, how to determine the correlation between
changes in product quality conditions for the causes?

2. Surface roughness of a machining product is an important factor
determine the quality of geometry. Explain the following:
a. Explain how the surface roughness measurement tool works!
b. Explain the concept of measuring surface roughness!
c. How are the surface measurements results stated (written down)?

1. Consider a case in which you have a material that support a certain stress at 75^oC and you have several candidate polymers for which you need to determine the Tg using DSC or DMA(both of these are in your lab). Which technique would you select? Please provide a basis for your selection in terms of how the type of information it provides (based on how it works) and how/why it would be best suited for this application.

At the beginning of compression of an ideal Diesel cycle the gas has a temperature and pressure of 40⁰C and 90 kN/m², respectively. The volume ratio of compression is 16:1. The maximum temperature of the cycle is 1400⁰C. Determine, for the cycle,

1. the pressure and temperature at each of the cycle process change points,                            [8]
2. the work done/kg gas,                                                                                                                           [4]
3. the thermal efficiency,                                                                                                                           [4]
4. the work ratio,                                                                                                                                         [3]
5. the mean effective pressure,                                                                                                                [3]
6. the Carnot efficiency within the cycle temperature limits.                                                           [3]

Take, γ=1.4 , cp = 1.004 kJ/kg K.

One kilogram of air is taken through a constant volume cycle. At the commencement of the adiabatic compression, the pressure and temperature are 103 kN/m² and 100⁰C respectively. The adiabatic compression has a volume ratio of 6:1. The maximum pressure of the cycle is 3.45 MN/m². Determine, for the cycle,

1. the pressure, volume and temperature at each of the cycle process change points,                [8]
2. the heat transferred to the air,                                                                                                            [3]
3. the heat rejected by the air,                                                                                                                 [3]
4. the ideal thermal efficiency,                                                                                                                 [4]
5. cyclic work                                                                                                                                                 [4]
6. the mean effective pressure.                                                                                                               [3]

For the air, take, R = 0.287 kJ/kg K, γ=1.4