Chapter 13 - Achieving Energy Sustainability (Renewable Energy)

Case Studies and Chapter Overview

• Case Study: The Boy Who Harnessed the Wind - Netflix

  • The story of the boy who harvested the wind showcases innovative renewable energy solutions.

  • This case exemplifies how creativity can lead to sustainable energy innovations that inspire others.

• Case Study: RITE Tidal Energy Project

  • Located in the East River, this project utilizes strong water currents that change direction between tides (flood and ebb).

  • Demonstrates the potential of tidal energy as a reliable source of renewable power.

Energy Generation Challenge

• Design Challenge:

  • Create an electrical generator using an old R/C motor and an LED light.

  • This hands-on activity emphasizes practical skills in renewable energy.

Understanding Renewable Energy

• Renewable Energy - can be regenerated in a reasonable time frame (e.g., wood, biofuels).

  • Includes energy sources such as tidal, wind, geothermal, and solar which are nondepletable

• Non-depletable vs depletable

  • Renewable Depletable Energy - Renewable resources such as biomass and wood can be exhausted if overused or mismanaged.

  • Non-Depletable Energy - Renewable sources that can be naturally replenished in a short time and are sustainable without exhaustion, including solar, wind, geothermal, and tidal/hydroelectric

• Key Concept: Reducing Energy Demand

  • Big Idea:

    • The critical change is less about energy sourcing and more about energy demand reduction.

    • Emphasizes the importance of awareness in energy consumption habits.

  • Brainstorm methods to cut energy use:

    • Across transportation, technology, and home settings.

Methods to Reduce Energy Use

• Energy Conservation - doing less

  • Strategies to use less energy (e.g., lowering thermostats, reducing driving).

  • Focuses on lifestyle changes and habits that minimize energy consumption.

• Energy Efficiency - doing the same thing better

  • Achieving the same results with less energy (e.g., maintaining comfort with lower energy input).

  • Involves using technology or materials that require less energy for the same output.

Importance of Conservation and Efficiency

• Cost-Effectiveness:

  • Conservation and efficiency are low-cost, environmentally friendly ways to enhance energy resources.

  • They can lead to significant savings for consumers and reduce environmental impact.

• Tiered Rate System:

  • Some utilities charge higher rates when usage increases.

  • This structure encourages users to conserve energy during peak times.

• Peak Demand:

  • The maximum energy consumption level at any given time.

  • Understanding peak demand is crucial for managing energy supply and demand effectively.

Benefits of Energy Conservation and Efficiency

• Backup Energy Sources:

  • Utilities often have additional power available to handle peak demands.

  • This ensures reliability in energy supply, especially during high use periods.

• Variable Price Structures:

  • Consumers can save money by using energy during off-peak times.

  • Offers an incentive for users to shift their energy usage patterns.

• Understanding EROEI and Payback Time:

  • EROEI (Energy Return on Energy Invested) relates to payback timeframes for energy investments.

  • Important for evaluating the viability of renewable energy projects.

• Energy Intensity:

  • Decrease in intensity observed, yet total energy consumption remains high.

  • Highlights the need for ongoing efforts to reduce overall energy use.

Sustainable Building Design

• Improved Building Efficiency:

  • Focus on energy efficiencies in architecture and construction.

  • Involves the use of sustainable materials and designs.

• Zero Net Energy Buildings:

  • Structures designed to consume minimal energy and can generate surplus energy through renewable sources.

  • These buildings are at the forefront of sustainable architecture.

Renewable Energy Types

• Solar Energy:

  • Direct Solar Energy:

    • Direct sunlight harnessed for heating and electricity.

    • Utilizes technologies like solar panels for efficiency.

  • Passive Solar Energy:

    • Utilizing building orientation and materials to collect and retain heat.

    • Aimed at reducing energy demands for heating.

• Biomass Energy:

  • Derived from organic materials and frequently used for electricity and fuel alternatives (e.g., ethanol, biodiesel).

  • Represents a renewable energy source by converting waste into usable energy.

• Hydroelectric Energy:

  • Generated through water movement; significant renewable energy source worldwide.

  • Types of systems:

    • Run-of-the-River: Water channeled directly without significant storage.

    • Water Impoundment: Water stored behind dams for controlled energy generation.

    • Tidal Systems: Leveraging tidal movements for energy.

• Geothermal Energy:

  • Energy derived from Earth’s internal heat.

  • Provides a constant energy source, often used for heating and electricity.

• Wind Energy:

  • Fastest-growing energy source, converting kinetic energy via turbines.

  • Utilizes wind conditions to generate significant energy outputs.

• Hydrogen Fuel Cells:

  • Chemical reaction generates electricity, usable in various applications.

  • Potential for clean energy solutions in transportation and beyond.

Energy Conversion Efficiency Comparison

• Internal Combustion Engine (ICE) vs. Battery Electric Vehicle (BEV):

  • ICE Efficiency: Approximately 25%.

  • Coal Power Plant Efficiency: Approximately 35%.

  • Contextual Analysis:

    • Evaluates coal power against gasoline-derived energy from an efficiency standpoint.

Additional Topics of Interest

• Energy Intensity:

  • Understanding how energy use relates to economic output, illustrated by China/USA comparisons.

  • Essential for developing strategies to improve energy efficiency at national levels.