Green Engineering and Energy Efficiency Assignment Help

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ME7725 Green Engineering and Energy Efficiency Assignment - Kingston University London, UK

Assessment Title - Design and Testing of Wind Turbine

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Learning Outcome 1 - Discuss environmentally related technologies and materials that are fundamental in a range of industries including construction, structural mechanics, automotive and environmental operations.

Answer: Environmentally related materials and technologies play a crucial role in lots of industries, including structural mechanics, construction, environmental operations and automotive. Some of the key technologies and materials are:
1. Sustainable building materials:
2. Renewable energy systems:
3. Energy-efficient technologies:
4. Green infrastructure:
5. Eco-friendly transportation:
6. Advanced materials:
7. Water management technologies:
8. Waste reduction and management:
9. Air pollution control:
10. Environmental monitoring and assessment:
These materials and technologies assist reduce environmental impacts and promote sustainability, support eco-friendly practices across various industries.

Learning Outcome 2 - Discuss environmental issues related to resource provision and consumption necessary for the manufacture of engineered products, and analyse potential for the application of alternative energy sources.

Answer: Environmental issues related to resource provision and consumption for engineered products include:
1. Resource depletion: Over-extraction of raw materials, leading to scarcity and increased costs.
2. Energy consumption: High energy requirements for production, processing, and transportation contribute to greenhouse gas emissions.
3. Water usage: Significant water consumption for manufacturing, processing, and cooling systems.
4. Material waste: Generation of waste materials during production, assembly, and end-of-life disposal.
5. Pollution: Release of pollutants, such as chemicals, heavy metals, and particulate matter, during production and disposal.

To address these problems, alternative energy sources can be applied:
1. Renewable energy:
2. Energy efficiency measures:
3. Sustainable materials:
4. Closed-loop production:
5. Alternative manufacturing processes:

Potential applications of alternative energy sources:
1. Electric vehicles: Powered by renewable energy sources, reducing emissions and dependence on fossil fuels.
2. Smart grids: Integrating renewable energy sources, energy storage, and efficient distribution systems.
3. Carbon capture and utilization: Converting CO2 into valuable chemicals and materials.
4. Bio-based manufacturing: Using biomass and biowaste to produce chemicals, fuels, and materials.
5. Circular economy: Designing systems and products that promote reuse, recycling, and upcycling.
By adopting these tactics, industries can reduce their environmental footprint, promote sustainable development, and mitigate climate change.

Learning Outcome 3 - Specify and develop energy efficient and environmentally conscious products.

Answer: To specify and build up energy-efficient and environmentally conscious products, consider the given steps:
Step 1: Define Product Requirements
Step 2: Material Selection
Step 3: Design for Energy Efficiency
Step 4: Minimize Waste and Emissions
Step 5: Energy-Efficient Manufacturing
Step 6: Product Testing and Validation
Step 7: Certification and Labeling
By following this process, companies can prepare products that not only meet customer needs but also reduce environmental impacts and promote sustainability.

Explore and analyze energy demand intricacies to identify the most effective and sustainable technologies and methods of energy production, ensuring optimized industrial power management, innovative electronic solutions, and efficient energy storage systems for a greener future.

Aim - The aim of this assignment is to extend your ability to apply analytical techniques to the design and performance of wind turbines.

Assessment Task - Wind Turbine Technology and Application

In this part of assignment there are SIX problems related to wind turbine which you need to answer all.

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Problem 1 - (I) Estimate the annual energy production from a horizontal axis wind turbine with a 35 m diameter operating in a wind regime with an average wind speed of 7 m/s based on average speed data only. Assume that the wind turbine is operating under standard atmospheric conditions (air density ρ = 1.225 kg/m³) and the turbine efficiency is 0.42.

(II) Find the size of a wind turbine rotor (diameter in m) that will generate 300 kW of electrical power in a steady wind (hub height) of 8 m/s. Assume that power coefficient Cp = 16/27 and electro/mechanical efficiency η = 1.

Problem 2 - (I) Estimate the wind speed at a height of 110 m over surface terrain with a few trees, if the wind speed at a height of 10 m is 5 m/s.

(II) Wind turbine blades are made in many different ways and from many different materials. Discuss the most important factors in the selection of materials for blade construction and describe how wood composite and glass fibre reinforced plastic is used to make blades.

Problem 3 - (I) The capacity factor is a useful parameter when comparing the performance of energy sources. What is the definition of the capacity factor?

(II) A typical nuclear power plant has a capacity factor of around 90%, while the capacity factor for large scale wind turbines is around 40%. Discuss the reason for such wide gap between the capacity factors of these two types of energy production systems.

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Problem 4 - A three-bladed wind turbine with radius of 50 m produce 1500 kW at a wind speed of 11 m/s. Air density is 1.225 kg/m³. Under these conditions

(I) What is the rotational speed of the rotor in rpm when it operates at tip speed ratio of TSR=6?

(II) What is the tip speed of the rotor?

(III) If the generator needs to turn at 1800 rpm, what gear ratio of generator to rotor is needed to match the rotor speed to the generator speed?

(IV) What is the overall efficiency of the complete wind turbine (blades, gearbox and generator) under these conditions?

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Problem 5 - Design an optimum blade based on Betz and Schmitz for a three-bladed turbine. The lift-to-drag ratio and the lift coefficient of the aerofoil against the angle of attack (AoA) are given in Figure 5.1, and the exact values from these curves are tabulated in Table 5.1. The curves giving the power coefficient against the tip speed ratio (TSR) for typical three-bladed machines can be found in Figure 5.2.

Table 5.1: Some values from the curves in Figure 5.1.

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(I) Give formulas for calculating the chord length and the pitch angle of the blade based on optimum Betz and Schmitz methods. Note that the pitch angle is defined as the angle between the chord line and the plane of blade rotation. Assume a pitch angle of zero. Explain all symbols and quantities that appear in the formulas and draw a figure explaining the angles.

(II) Apply the formulas to a three-bladed turbine for blades with radius R = 80m and a pitch angle of zero: explain how you select the values of the parameters appearing in the formulas, and fill in the Table below, with r being the distance from the hub along the blade in meter and the twist angle in degree. Plot variation of chord length c and twist angle β versus r/R.

(c) Explain why the blades have to be twisted.

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Problem 6 - Figure 6(a) shows the lift and drag characteristics for a NACA 4415 aerofoil.

(I) Using the graphs shown in Figure 6(a), determine the best operating point (angle of attack) for the aerofoil at Reynold's number (Re) of 3×10⁶. Find the values of lift coefficient (C_L) and drag coefficient (C_D) at this best point and at static stall?

(II) A yearly histogram of wind speed for a location and generated power is shown in Figure 6(b). Find the maximum output and power capacity of this turbine.

Note - Please submit your final report in WORD format.

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