Wind power generation system design;

a-) Adopt Rayleigh wind regime.

b-) Specify the power factor of the wind turbine.

c-) Find the start, stop and nominal speed of the wind turbine

d-) Calculate the annual energy production of the system

I need solving question 2 only?

Q1.

In an Otto cycle air is compressed from an initial pressure 120 kPa and temperature 350 (K). The cycle has compression ratio of 10. In the constant volume heat addition process 1000 kJ/kg heat is added into the air. Considering variation on the specific heat of air with temperature, determine,

(a) the pressure and temperature at the end of heat addition process (show the points on P-v diagram)

(b) the network output

(c) the thermal efficiency

(d) the mean effective pressure for the cycle

The gas constant of air is R = 0.287 kJ/kg.K

Q2.

Repeat Q1 using cold air standard assumption.

(Properties: The properties of air at room temperature are cp = 1.005 kJ/kg·K, cv = 0.718 kJ/kg·K, R = 0.287 kJ/kg·K, and k = 1.4)

A regenerative Rankine cycle operates with inlet conditions of 800°C and 5MPa and exhausts to a pressure of 10kPa. A single open-feedwater heater is used with an extraction pressure of 0.8 MPa. Assume the exit states of the condenser and the feedwater heater are both saturated liquids. The turbine and pump isentropic efficiencies are 100%.

1. Draw the T-s diagram and determine the thermal efficiency for the cycle and the total turbine work per unit boiler mass flow rate (kJ/kg)
2. Repeat the problem in part 1, but replace the open feed water heater with a closed feed water heater where the extracted steam is pumped to the boiler pressure before being combined with the condenser feed water
3. Repeat the problem in part 2, but where the extracted steam is throttled from the closed feed water heater exit to the condenser

Consider an ideal Rankine cycle modified with the addition of a single reheat stage. The working fluid is H20. The maximum pressure in the cycle is 10MPa, and the temperature of the steam exiting both the boiler and the reheater is 550°C. The pressure in the condenser is 10kPa.

1.Draw the T-s diagram for the following three cases.

a) 4.5MPa (= 0.25Pmax + 2MPA)

b) 2.5MPA (= 0.25Pmax)

c) 0.5MPa (= 0.25Pmax - 2MPA)

2.Calculate the thermal efficiency for the three reheat cycles in part 1

The propane is contained in a piston-cylinder assembly, which maintains constant pressure at 0.2 MPa. If a mixture with a quality of 0.65 and a total volume of 0.07 m3 is slowly heated to a temperature of 54°C.

a) what was the total work into the system.

b) what was the total amount of heat added to the system.

Steam leaves the boiler of a 100 MW Rankine cycle power plant at 400°C and 3.5MPa. The Turbine has an isentropic efficiency of 85% and exhausts at 15 kPa. In the condenser, the water is subcooled to 38°C by lake water at 13°C. The pump isentropic efficiency is 75%.

1. Draw and label the T-s diagram for this cycle

2. Determine the cycle’s thermal efficiency

3. Determine the mass flow rate of the steam in the boiler (kg/h)

4. Determine the back-work ratio

5. Determine the minimum required cooling water flow rate if regulations limit the cooling water temperature rise to 10°C (kg/h)

Bruce, a research chemist for a major petro-chemical company, wrote a dense report about some new compounds he had synthesized in the laboratory from oil-refining by-products. The bulk of the report consisted of tables listing their chemical and physical properties, diagrams of their molecular structure, chemical formulas and computer printouts of toxicity tests. Buried at the end of the report was a casual speculation that one of the compounds might be a particularly effective insecticide.

Seven years later, the same oil company launched a major research program to find more effective but environmentally safe insecticides. After six months of research, someone uncovered Bruce’s report and his toxicity tests. A few hours of further testing confirmed that one of Bruce’s compounds was the safe, economical insecticide they had been looking for.

Bruce had since left the company, because he felt that the importance of his research was not being appreciated.

1. Define the rhetorical situation: Who is communicating to whom about what, how, and why? What was the goal of the communication in each case?
2. Identify the communication error (poor task or audience analysis? Use of inappropriate language or style? Poor organization or formatting of information? Other?)
3. Explain what costs/losses were incurred by this problem.
4. Identify possible solutions or strategies that would have prevented the problem, and what benefits would be derived from implementing solutions or preventing the problem.

How does the processing and structure of glasses affect fracture toughness for

1. annealed glass

2. silica glass

3. pyroceram

Describe the purpose and implication of observability and observer for a dynamical system, respectively, and in particular, what is their relationship? You may use examples to help explain your points.

4. A two-stage cascade cooling system operates between the pressure limits of 1 and 0.1 MPa. Each stage operates on the ideal vapor compression cooling system and the refrigerant R-134a is used as working fluid. The heat transfer from the lower to the upper cycle takes place in an adiabatic reverse flow heat exchanger where both streams enter about 0.4 MPa. The refrigerant mass flow rate is 0.24 kg / s throughout the upper cycle.
a. sub-loop mass flow rate of refrigerant
b. heat extraction rate and compressor input power from chilled area
c. Determine the COP value.

- Aluminum and Steel Samples

Dog-bone shaped samples Thickness = .003 inches; Width = 4 mm; Length = 8 cm

- Polycarbonate Plastic Samples

Dog-bone shaped samples Thickness = .015 inches; Width = 4 mm; Length = 8 cm

- iPod Wire Diameter = 1.2 mm for “thin”; Diameter = 2.0mm for “thick”; Length = 7 cm for both

Calculate the stress (Force/Area) and strain (Elongation/Length) for all samples.

For the stress data given below with the nearest error of 1:

32

17

38

82

48

5

37

13

19

31

19

a) Construct a frequency distribution table.

b) Construct the three types of statistical graphs.

c) Determine the (1) Mean, (2) Median, (3) Mode, (4) Range,

Variance, and (6) Standard Deviation.

Using the principles of motion economy and ergonomcs, discuss how a supermarket checkout can be designed to improve the efficiency and the safety of the cashier

Design a geothermal source power generation system;
a) Describe the type of geothermal power plant (Total Flow / Flash / Binary) 
b) Describe the turbine isentropic efficiency
c) Show the entire cycle in the T-s diagram.
d) Calculate the power produced.

answer for expert: Not all , just one of theese three ( Total flow / flash or binary)