4 Energy Conservation and Transportation

Energy Conservation and Transportation

Importance of Energy Conservation

  • Reducing energy consumption helps to:

    • Decrease air and water pollution.

    • Mitigate climate change impacts.

    • Reduce dependence on fossil fuels by transitioning to renewable energy sources.

    • Save money on energy bills.

Energy Consumption in the United States

  • The US is the second largest consumer of energy globally.

  • The U.S. Department of Energy classifies energy use into four sectors:

    • Transportation

    • Residential

    • Commercial

    • Industrial

Key Regulations and Programs

  • Energy Star: A joint program by EPA and the U.S. Department of Energy to promote energy-efficient products and practices.

  • EPA (Environmental Protection Agency): A government body dedicated to protecting human and environmental health.

  • CAFE Standards (Corporate Average Fuel Economy): Regulations that enhance the fuel economy of vehicles sold in the US, with an average of 27.5 mpg.

Methods to Save Energy

Power Plants

  • Cogeneration: Captures excess heat during electricity generation for heating buildings and producing other power.

  • Coal Gasification & Combined Cycle Generation: Treats coal to generate hot gases for turbines and uses exhaust heat to drive steam turbines, potentially doubling efficiency.

Industrial Building Design

  • LEED (Leadership in Energy and Environmental Design) Certification: Focuses on sustainability in building practices.

Residential and Commercial Energy Saving Strategies

  • Energy Star Certified Appliances: Offers tax credits and rebates.

  • Public education on energy-efficient practices.

  • Insulation and air leak sealing.

  • Programmable HVAC thermostats and energy monitors (e.g., Sense monitor).

  • Usage of LED lighting: More efficient, less heat emission, and no mercury compared to fluorescent lights.

  • Minimize phantom/vampire loads from unused plugged-in devices.

  • Passive solar design to enhance efficiency:

    • Reduces winter heat loss and summer heat gain.

    • Examples: double or triple-pane windows.

  • Green retrofitting for improved energy efficiency.

Lighting Options

CFL vs. LED

  • CFL (Compact Fluorescent Light):

    • Contains mercury, heavier (25-30 pounds).

  • LED (Light Emitting Diode):

    • More efficient, less waste heat, brighter, lighter, and longer lifespan.

Passive Solar Home Design Concepts

  • Use of design features and landscape to optimize sunlight exposure and ventilation.

  • Key elements include:

    • Trombe wall for heat retention.

    • Seasonal shading techniques.

    • Insulation materials to maintain comfortable indoor temperatures.

    • Maximization of thermal mass for energy regulation.

Transportation Sector Energy Efficiency

  • The transportation industry is the largest petroleum consumer.

  • CAFE Standards: Established in 1975, lead to annual savings of over 55 billion gallons of fuel and a reduction of 10% in CO2 emissions.

    • Improved engine design, weight reduction, and efficiency are main strategies.

  • Historical context: Regulations changed in response to the 1973-74 Arab Oil Embargo, leading to significant changes in fuel economy standards and vehicle design.

Fuel Economy and Types of Fuels

Miles Per Gallon (MPG)

  • Importance of MPG for vehicle choices:

    • Example: compact cars achieving up to 32(c)/42(h) mpg.

Alternative Fuel Sources

  • Electric vehicles (EVs)

  • Compressed natural gas (CNG)

  • Hydrogen

  • Biofuels (e.g., biodiesel)

Incentives for Alternative Fuels

  • HOV (High-Occupancy Vehicle) lanes for efficiency.

  • Expanding charging infrastructure.

  • Government procurement of alt-fuel vehicles.

  • Tax rebates and subsidies for consumers and manufacturers.

Vehicle Types

CNG Vehicles

  • Also known as NGVs, have pros and cons relative to fuel efficiency and infrastructure.

Electric Vehicles (PEV and HEV)

  • PEV: only run on rechargeable batteries, no CO2 emissions.

  • HEV: combines battery and gasoline, less charging infrastructure.

Energy Conservation at Home

Strategies for Reducing Energy Use

  • Utilize TOU (Time of Use) pricing.

  • Switch to LED lighting and use natural light where possible.

  • Unplug unused appliances to avoid phantom loads.

  • Use energy-efficient appliances (Energy Star).

  • Optimize thermostat settings (cooler in winter, warmer in summer).

  • Practice shorter showers and air drying clothes to save energy.

Conclusion

  • Awareness and diligent actions in energy conservation can lead to reduced costs and environmental benefits.