Laura Schaefer - Energy and Alternative Fuels
Transcript of Laura Schaefer - Energy and Alternative Fuels
Energy and Fuels
Laura Schaefer
McMurtry Professor and Department Chair Mechanical Engineering
Rice University
http://laura.schaefer.web.rice.edu/
Presentation Overview
• Overall Energy Outlook – Global – National – Sectors + Food-Energy-Water Nexus
• Conventional vs. Renewable Electricity Generation
• Residential and Commercial Sectors • Transportation Sector • Industry • Broader Impacts and Solutions
Global Energy Outlook
• Energy consumption has serious economic, environmental and social ramifications
Sources for all charts and numbers are given at the end of the presentation.
World Energy Consumption
Per Capita World Energy Consumption
Environmental Consequences: CO2 Emissions
Mill
ion
Met
ric T
ons
We’ll Just Use Renewables, Right?
Renewable Energy Share of Global Energy Consumption
Renewable Energy Share of Electricity Production
Economic Consequences: Global New Investment in Renewables
Other Economic Consequences
Social Consequences
Social Consequences
• Millennium Development Goals – To eradicate extreme poverty and hunger – To achieve universal primary education – To promote gender equality and empower women – To reduce child mortality – To improve maternal health – To combat HIV/AIDS, malaria, and other diseases – To ensure environmental sustainability – To develop a global partnership for development
Energy Consumption in the U.S. and North America
• What about closer to home? • How does U.S. energy consumption
compare to the rest of the world? • How has it changed over time?
Consumption Per Household
Consumption Per Person
CO2 emissions M
illio
n M
etric
Ton
s
U.S. Renewable Energy Consumption by Source and Sector
Energy Consumption by Sector
• Electricity Generation • Residential and Commercial • Transportation • Industry
Food-Energy-Water Nexus
Food-Energy-Water Nexus (1)
• Water and Energy Are Inextricably Linked – Water has been used to generate energy for
hundreds of years – Energy input is required to create clean water.
Food-Energy-Water Nexus (2)
Food-Energy-Water Nexus (3)
• Sewage Treatment: Up to 50+ kBtu/GPD • Water “Transportation” • Desalination
Desalinization via Reverse Osmosis Traditional water treatment: $0.50 per 1000 gallons RO for seawater: $2–3 per 1000 gallons RO for brackish water: $1–1.50 per 1000 gallons RO Costs:
Fixed Costs: 37% Electricity: 44% Membrane replacement: 5% Labor: 4% Maintenance: 7% Consumables: 3%
Energy and Water: An Integrated View
Food-Energy-Water Nexus (1)
• Food as a producer of energy – In 2000, 90% of corn crop went to feed people
and livestock, <5% to produce ethanol – In 2015, 40%+ of corn crop went to produce
ethanol – Grain required to fill a 25-gallon gas tank =
food for one person per year – Direct emission are less, indirect + direct
emissions are equivalent
Food-Energy-Water Nexus (2)
• Food as a consumer of energy – Direct Use: Harvesting, Drying, Transport,
Livestock, etc. – Indirect Use: Fertilizers, Pesticides, etc.
Food-Energy-Water Nexus (3)
Electricity Generation: Conventional and Renewable
• Current State • New Technologies Using Conventional Fuels • Renewable Energy Technologies
U.S. Electric Utilities
Year
Pow
er G
ener
atio
n
Emis
sion
s
(Buildings account for 40% of energy consumption)
350.0
400.0
450.0
500.0
550.0
600.0
650.0
700.0
750.0
800.0
1000.0
1500.0
2000.0
2500.0
3000.0
3500.0
4000.0
4500.0
1980 1985 1990 1995 2000 2005 2010 2015
Net Power Generation (Billion kWh)
Emissions (Million Metric Tons Carbon)
Natural Gas-Fired Electricity Generation Expected to Reach Record Level in 2016
Monthly U.S. Renewable Electricity Generation in 2016 Surpasses Previous Years
Renewables’ Share of North America Electricity Mix Expected to Rise
New Technologies Using Conventional Fuels (1)
• New Extraction and Processing Techniques – Fracking
New Technologies Using Conventional Fuels (2)
• New Extraction and Processing Techniques – Syngas
New Technologies Using Conventional Fuels (3)
• Higher Efficiency Power Plants – Energy Recovery – Dry Cooling
New Technologies Using Conventional Fuels (4)
• Advanced Technologies – Fuel Cells (SOFC, etc.) – Cascading Energy Systems – Waste Heat Recovery – Distributed Generation
SupporttubeAir flow
Anode
Fuel side
Interconnection
Electrolyte
Cathode
xro
Current in
Joule heating
Electrochemicalreaction heat
Current outNickel belt
Nickel belt
Distributed Generation: Optimal Power Network Design
• Use Waste Heat at Plant Location • Location
– Cost – Transmission Losses – Deterministic and Stochastic Issues
• Reliability – Back-Up Power – Failure Probabilities
Renewable Technologies
• Solar (PV/T) • Wind (Turbines) • Water (Hydropower/hydrokinetics) • Energy Harvesting • CHP/Cascading Energy Systems
Solar Technologies
• Photovoltaics – Nano-based technology – Organic cells – High concentration MJ cells – Building integrated PV (Tesla Solar Shingles)
• Thermal – Heating – Power towers – Organic Rankine cycles
Wind Technologies
• Wind Turbines – On land – At sea
Water Technologies (1)
• Traditional techniques have involved dams
Three Gorges Dam produces ~10X power of Hoover Dam, yet displaces hundreds of thousands
Water Technologies (2)
• New approaches include: – Run-of-river hydrokinetic turbines – Piezoelectrics – Wave Generation
• Imbedded • Floating
Energy Harvesting
• Thermoacoustic Refrigeration • Thermoelectric Energy Harvesting
Stack Length vs Cooling Power
-0.02
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0.16
0.005 0.007 0.009 0.011 0.013 0.015
Stack Length (m)
Cool
ing
Pow
er (W
)
10%20%30%40%50%60%70%80%
Combined Heating and Power
• Multijunction PV Cells (GaInP/GaAs/Ge) Have Very High Efficiencies
• Can Minimize Cell Area (and Cost) With Concentrating Lenses
• Increased Temperatures Lead to Decreased Efficiency
Useful Waste Heat
Qloss
Qoffset
Wpump
Can Combine Renewable and Traditional Energy Systems in Cascading Energy Systems
PV
SOFC
Turbine
Chiller
Boiler
Electricity
ChilledWater
Hot Water
PV
SOFC
Turbine
Chiller
Boiler
Electricity
ChilledWater
Hot Water
U.S. Residential and Commercial Consumption
• 39% of U.S. Primary Energy Use • 11 Trillion kWh (38 Quadrillion Btu) • $200 Billion • 30% of Total U.S. Greenhouse Gas Emissions • 600 Million Metric Tons of Carbon • 4.6 Million Commercial Buildings • 12% of Potable Water Consumption
U.S. Residential and Commercial Consumption
• Focus on efficiency – high performance buildings – Equipment within a building
• HVAC units, electronics, unused resources, etc.
– Design of the building envelope • Also, distributed generation again
High Performance Buildings
• High-performance buildings use minimal energy input (i.e. - electricity, natural gas, biomass) to provide all of their electrical, heating, and cooling needs
• Flexible, Functional Workplaces • Protect the Natural Environment • Integrated “Whole-Buildings” Approach
Definition of Bioclimatic Architecture
• The design of buildings or urban spaces that takes into account climate and environmental conditions to help achieve thermal comfort.
• Deals with architectural elements, avoiding mechanical systems, which are regarded as support rather then solution.
• Vernacular architecture as good examples:
Climate Consciousness
• Characteristics of specific climate: – Dry bulb temperature – Wet bulb temperature – Maximum and minimum temperatures – Wind velocity – Direction of predominant winds – Relative humidity – Precipitation – rain, snow etc.. – Annual distributions – distinct periods – Macro and Micro climate
Learning From the Vernacular
• High thermal mass • Protection against solar radiation • Use of solar radiation • Use of natural resources • Conscious choice of built form • Protection against wind
– Entrance protection • Capturing wind
– Location of openings • Protection against cold temperature • Town planning (site, shape, street orientation)
Not all vernacular is all that comfortable. Don’t romanticize!
Transportation
• New fuels • Hybrid vehicle design
– Battery capacity • Light-weighting, streamlining, other design
improvements
U.S. Biodiesel Production
384.74 million gallons of gas consumed each day
Vehicle Types
Vehicle Types
Vehicle Types
Vehicle Types
Vehicle Types
Advantages/Disadvantages
• Whether Using Natural Gas or Electricity, Not Really Zero Emissions
• Methane ⇒ Hydrogen – Steam reforming – CH4 + H2O => 3H2 + CO – CO + H2O => H2 + CO2 – 80% efficiency
• Power Plant Emissions – 33%-45% efficiency
Industry
• Everything is interconnected
Approximately 32 liters of water to produce a 2-gram microchip; a microchip manufacturing plant can easily use one million gallons of water per day. 16000 tons of water per ton of chips!
Industry & Sustainable Water Use
225 tons of water per ton of paper (US, Europe); 450 tons of water per ton of paper (China)
6 tons of water per ton of steel (US & Europe); 20-60 tons of water per ton of steel in China
What Do We Need?
• “Better” Means To: – Convert – Utilize – Distribute
Energy • Better = Lower Emissions, Lower Costs,
Higher Security, Higher Safety, Etc.
How Do We Solve These Problems?
• Science and Engineering Fundamentals • Working with Military, Public Health, Policy,
Other Agencies • Local and International • Research, Education,
Outreach
Research
Education Outreach
Now is the Time
• Climate change may be escalating so fast it could be ‘game over,’ scientists warn – Independent, 11/9/16 – New research suggests the Earth’s climate could be more sensitive
to greenhouse gases than thought, raising the spectre of an ‘apocalyptic side of bad’ temperature rise of more than 7C within a lifetime.
• As we recover from this recession, the transition to clean energy has the potential to grow our economy and create millions of jobs - but only if we accelerate that transition. Only if we seize the moment. – President Barack Obama (1/29/2012)
Organize and Measure the Best of our Energies and Skills
September 12, 1962
We meet at a college noted for knowledge, in a city noted for progress, in a State noted for strength, and we stand in need of all three, for we meet in an hour of change and challenge, in a decade of hope and fear, in an age of both knowledge and ignorance. The greater our knowledge increases, the greater our ignorance unfolds. Despite the striking fact that most of the scientists that the world has ever known are alive and working today, despite the fact that this Nation¹s own scientific manpower is doubling every 12 years in a rate of growth more than three times that of our population as a whole, despite that, the vast stretches of the unknown and the unanswered and the unfinished still far outstrip our collective comprehension. This is a breathtaking pace, and such a pace cannot help but create new ills as it dispels old, new ignorance, new problems, new dangers. Why choose this as our goal? And they may well ask why climb the highest mountain? Why, 35 years ago, fly the Atlantic? Why does Rice play Texas? We choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard, because that goal will serve to organize and measure the best of our energies and skills, because that challenge is one that we are willing to accept, one we are unwilling to postpone, and one which we intend to win.
Sources
• Renewables 2016 Global Status Report: http://www.ren21.net/status-of-renewables/global-status-report/
• DOE, EIA, Today in Energy: http://www.eia.gov/todayinenergy/ • Burn, An Energy Journal:
http://burnanenergyjournal.com/how-much-energy-are-we-using/ • International Renewable Energy Agency:
http://www.irena.org/home/index.aspx?PriMenuID=12&mnu=PriPriMenuID=12&mnu=Pri
• Alternative Fuels Data Center: http://www.afdc.energy.gov/ • Bloomberg, Energy Revolution:
https://www.bloomberg.com/gadfly/articles/2016-11-09/trump-cannot-halt-the-march-of-clean-energy
Sources (cont.)
• DOE Report On The Water-Energy Nexus: http://energy.gov/under-secretary-science-and-energy/downloads/water-energy-nexus-challenges-and-opportunities
• Watergy: https://www.ase.org/projects/watergy • Agriculture’s Supply and Demand for Energy and Energy Products:
http://ers.usda.gov/data-products/ • Netanir:
http://www.netanir.ir/VisitorPages/show.aspx?IsDetailList=true&ItemID=638,1
• American Wind Energy Association: http://www.awea.org/Resources/Content.aspx?ItemNumber=5059
• DOE, EIA, Everything Explained: http://www.eia.gov/energyexplained/index.cfm/data/index.cfm
Acknowledgments
• NSF EFRI-1038139, CBET-1233106,CBET-0729905, DGE-0504345, CBET-0238841, ECCS-052463, and EEC-0203341
• AFOSR F49620-03-1-0278 • ASHRAE 702237 • PITA 1040310-152757
Acknowledgments
Extra Slides
Renewable Energy Consumption and Energy CO2 Emissions
Solid Oxide Fuel Cells
SOFC Advantages: • High efficiency • Environmentally friendly • All solid parts • No expensive catalysts • Flexible fuel option • High temperature waste
heat (around 1000°C ) suitable for cogeneration/ bottoming cycles
Cooling
Cooling η cycle =
Cooling Energy
Solar Energy
η cycle = Cooling Energy
Electricity
Cooling η cycle =
Cooling Energy
Fossil fuel
Comparing Conventional and Renewable Technologies: Apples to Oranges
Cooling η cycle =
Cooling Energy
Solar Energy
Cooling Cooling Energy
Solar Energy
η cycle =
Back to the Beginning
Efficiency Comparison
= 5110
U.S. Crude Oil Production and Energy Consumption