Transcript Thermodynamics

Thermodynamics
Convection ovens, solar power,
and thermocouples.
Convection Ovens
• Instead of heating the food from the bottom (like
a regular oven does), a convection oven uses a
built-in fan to circulate the hot air through the
cooking area. Food heats faster because the
moving air strips away the thin layer of air which
otherwise would surround and insulate the food.
The heat is also distributed more evenly, without
"hot spots". Food cooked in a convection oven
rarely burns and comes out nice, crispy and
evenly cooked.
"single samsung oven." appliancist. N.p., n.d. Web. 30 Jan. 2011. <http://www.appliancist.com/
builtin_ovens/samsung-dual-cooking-twin-convection-oven.html>.
"How to Use Humidity Control in Heat Processing ." Process Heating. N.p., 2010. Web. 30 Jan. 2011.
<http://www.process-heating.com/Archives/b88c9e379a268010VgnVCM100000f932a8c0____>.
Solar Power
• Whether on a solar-powered calculator or
an international space station, solar panels
generate electricity using the same
principles of electronics as chemical
batteries or standard electrical outlets.
With solar panels, it's all about the free
flow of electrons through a circuit.
Basic how it works
•
•
•
Photons in sunlight hit the solar panel and are
absorbed by semiconducting materials, such
as silicon.
Electrons (negatively charged) are knocked
loose from their atoms, allowing them to flow
through the material to produce electricity. Due
to the special composition of solar cells, the
electrons are only allowed to move in a single
direction.
An array of solar cells converts solar energy
into a usable amount of direct current (DC)
electricity.
"Life - Student Level." Citizendium. N.p., 8 June 2009. Web. 30 Jan. 2011. <http://en.citizendium.org/wiki/Life/Student_Level>.
Thermocouples: what are they?
a kind of thermometer consisting of two
wires of different metals that are joined at
both ends; one junction is at the
temperature to be measured and the other
is held at a fixed lower temperature; the
current generated in the circuit is
proportional to the temperature difference
"Facility Elements and Protection Requirements." Feed: My Electrical
Engineering Blog - AggScore:
49.7. N.p., 27 Apr. 2009. Web. 30 Jan. 2011. <http://www.feedagg.com/feed/195579/ ElectricalEngineering-Blog>.
"Temperature Sensor - The Thermocouple." Exploring Electrical Engineering. N.p., n.d. Web. 30 Jan. 2010.
<http://www.facstaff.bucknell.edu/mastascu/elessonshtml/Sensors/TempThermCpl.html>.
What are they used for?
• Thermocouples are suitable for measuring
over a large temperature range, up to
2300 °C
• They are used in the steel industry,
heating appliance safety, for testing
electronics, and even in radiation sensors.
"Temperature Sensor - The Thermocouple."
Exploring Electrical Engineering. N.p., n.d. Web.
30 Jan. 2010.
<http://www.facstaff.bucknell.edu/mastascu/eles
sonshtml/Sensors/TempThermCpl.html>.
Kusky, Timothy. "thermodynamics."
Science Online. Facts On File, Inc. Web. 31
Jan. 2011.
<http://www.fofweb.com/activelink2.asp?
ItemID=WE40&SID=5&iPin=EESS0238&Si
ngleRecord=True>.
Angelo, Joseph A., Jr.
"thermodynamics." Science Online.
Facts On File, Inc. Web. 31 Jan.
2011.
<http://www.fofweb.com/activelink2
.asp?ItemID=WE40&SID=5&iPin=ES
A2807&SingleRecord=True>.
Rosen, Joe, and Lisa Quinn Gothard.
"thermodynamics." Science Online.
Facts On File, Inc. Web. 31 Jan.
2011.
<http://www.fofweb.com/activelink2
.asp?ItemID=WE40&SID=5&iPin=EP
S1204&SingleRecord=True>.
Tabak, John. "mathematics and the laws of
thermodynamics." Science Online. Facts
On File, Inc. Web. 31 Jan. 2011.
<http://www.fofweb.com/activelink2.asp?
ItemID=WE40&SID=5&iPin=HMMLN0008
&SingleRecord=True>.
Rosen, Joe, and Lisa Quinn Gothard. "heat
and thermodynamics." Science Online.
Facts On File, Inc. Web. 31 Jan. 2011.
<http://www.fofweb.com/activelink2.asp?
ItemID=WE40&SID=5&iPin=EPS0101&Sin
gleRecord=True>.
Kirkland, Kyle. "heat engines." Science
Online. Facts On File, Inc. Web. 31
Jan. 2011.
<http://www.fofweb.com/activelink2
.asp?ItemID=WE40&SID=5&iPin=PI
OWTT0004&SingleRecord=True>.
Kirkland, Kyle. "heat and technology."
Science Online. Facts On File, Inc.
Web. 31 Jan. 2011.
<http://www.fofweb.com/activelink2
.asp?ItemID=WE40&SID=5&iPin=PI
OWTT0003&SingleRecord=True>.
"thermocouple." Science Online. Facts
On File, Inc. Web. 31 Jan. 2011.
<http://www.fofweb.com/activelink2
.asp?ItemID=WE40&SID=5&iPin=NS
170214&SingleRecord=True>.
Bailey, Jill. "solar power." Science
Online. Facts On File, Inc. Web. 31
Jan. 2011.
<http://www.fofweb.com/activelink2
.asp?ItemID=WE40&SID=5&iPin=FD
EE1830&SingleRecord=True>.