• Like

Loading…

Flash Player 9 (or above) is needed to view presentations.
We have detected that you do not have it on your computer. To install it, go here.

Uploaded on

High School Chemistry November 10, 2010

High School Chemistry November 10, 2010

  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
    Be the first to like this
No Downloads

Views

Total Views
143
On Slideshare
0
From Embeds
0
Number of Embeds
0

Actions

Shares
Downloads
0
Comments
0
Likes
0

Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. WELCOMETOCHEMISTRY
    1
    Instructor: Mrs. Balla HSChem_2010Nov10
  • 2. Let’s
    Discuss…
    Storing
    Solar Energy
    Indefinitely
    Instructor: Mrs. Balla HSChem_2010Nov10
    2
  • 3. Instructor: Mrs. Balla
    3
    Introduction
    We all know about solar thermal and solar photovoltaic energy, but MIT (Massachusetts Institute of Technology) is coming back to a solar energy idea that was dreamt up decades ago but left on the bench due to our inability to gather and make use of it in a practical and economical way.
    “This is the thermo-chemical approach, in which solar energy is captured in the configuration of certain molecules which can then release the energy on demand to produce usable heat,” David L. Chandler of MIT reports.
  • 4. Instructor: Mrs. Balla
    4
    The big advantage of this approach is that the heat-storing chemicals used can store the heat for years.
    In the normal solar-thermal approach, even with a lot of insulation, heat leaks out.
    Additionally, the process is reversible in this approach and the energy can be easily transferred from one place to another.
    So, it can be collected in a place ideal for collecting the energy but then used wherever needed.
    http://cleantechnica.com/2010/11/08/storing-solar-energy-indefinitely-new-energy-storage-approach-from-mit-video/?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+cleantechnica+%28CleanTechnica%29
  • 5. Instructor: Mrs. Balla
    5
    In an extreme example demonstrating this approach’s advantages, Jeffrey Grossman, the Carl Richard Soderberg Associate Professor of Power Engineering in the Department of Materials Science and Engineering, said: “You could put the fuel in the sun, charge it up, then use the heat, and place the same fuel back in the sun to recharge.”
  • 6. Instructor: Mrs. Balla
    6
    Here’s a little more history on the thermo-chemical approach and MIT’s recent breakthrough:
    Researchers explored this type of solar thermal fuel in the 1970s, but there were big challenges: Nobody could find a chemical that could reliably and reversibly switch between two states, absorbing sunlight to go into one state and then releasing heat when it reverted to the first state.
    Such a compound was discovered in 1996, but it included ruthenium, a rare and expensive element, so it was impractical for widespread energy storage.
    Moreover, no one understood how the compound worked, which hindered efforts to find a cheaper variant.
    Now researchers at MIT have overcome that obstacle, with a combination of theoretical and experimental work that has revealed exactly how the molecule, called fulvalenediruthenium, accomplishes its energy storage and release.
    And this understanding, they said, should make it possible to find similar chemicals based on more abundant, less expensive materials than ruthenium.
  • 7. Instructor: Mrs. Balla
    7
    The problem is still finding an alternative to the very rare and expensive (element ruthenium, but the researchers from this project are much more hopeful now that they can find an alternative.
    According to Grossman, the next step is “to use a combination of simulation, chemical intuition, and databases of tens of millions of known molecules to look for other candidates that have structural similarities and might exhibit the same behavior.”
  • 8. Instructor: Mrs. Balla
    8
    Basic Information of Ruthenium
    Name: Ruthenium Symbol:RuAtomic Number: 44 Atomic Mass: 101.07 amuMelting Point: 2250.0 °C (2523.15 K, 4082.0 °F) Boiling Point: 3900.0 °C (4173.15 K, 7052.0 °F) Number of Protons/Electrons: 44 Number of Neutrons: 57 Classification:Transition MetalCrystal Structure: Hexagonal Density @ 293 K: 12.2 g/cm3Color: silvery
    Number of Energy Levels: 5 First Energy Level: 2 Second Energy Level: 8 Third Energy Level: 18 Fourth Energy Level: 15 Fifth Energy Level: 1
    Facts
    Date of Discovery: 1844 Discoverer: Karl Klaus Name Origin: From the Latin word Ruthenia (Russia) Uses: platinum alloys Obtained From:pentlandite, pyroxinite
  • 9. Review
    What is the thermo-chemical approach to solar energy storage?
    Solar energy is captured in the configuration of certain molecules which can then release the energy on demand to produce usable heat.
    2. What is the big advantage of this approach?
    The heat-storing chemicals used can store the heat for years.
    Instructor: Mrs. Balla
    9
  • 10. 3. Is the process reversible?
    yes
    4. Can the energy be easily transferred from one place to another?
    yes
    5. How long has been this research been going on?
    since the 1970’s
    Instructor: Mrs. Balla
    10
  • 11. Questions? Questions? Questions?
    11
    What’s
    on
    your
    mind?
    Instructor: Mrs. Balla
  • 12. Questions? Questions? Questions?
    What was
    the best part
    of your
    Science lesson
    this past week?
    Instructor: Mrs. Balla
    12
  • 13. Questions? Questions? Questions?
    What
    are the challenges
    that you had
    this
    past week
    In Chemistry?
    13
    Instructor: Mrs. Balla
  • 14. Questions? Questions? Questions?
    What
    Chemistry
    topic
    will you
    be working on
    this
    coming week?
    14
    Instructor: Mrs. Balla
  • 15. Questions? Questions? Questions?
    What
    Chemistry
    topic
    would you
    like to know
    more
    about?
    Instructor: Mrs. Balla
    15