thermoelectric generator presentation
TRANSCRIPT
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Thermoelectric Generator
ICY HOT Power the Waybrought to you by Shaq
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Overview
◦ A thermoelectric generator produces electricity using the Seebeck effect. It takes advantage of the heat flow due to a temperature difference between two substances.
◦ The heat flows through a thermoelectric plate and is converted into electricity.
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Model
Thermoelectric plates StoppingMechanism
7 V Motor
Axel
HOT Side
HOT Side
COLD Side+
+
+
-
-
-
Styrofoam secondary container
Plastic primary container with cells
Medium Size Car
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EXOTHERMIC REACTIONS1
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Calcium Oxide Reaction
CaO(s) + H20(l) → Ca(OH)2(aq)◦ Upon Hydration, an exothermic
reaction occurs and the solid puffs up◦ Ratio: 1 L Water to 3.1 kg CaO → +
3.54 MJ◦ Temperature max: 100 oC
◦ Able to keep temperature at 100 oC through slaking time providing constant Heat
◦ Variables-Time required to convert all CaO to Ca(OH)2 (slaking time) -water to calcium oxide ratio-initial temperature of water
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CH3COO- (aq) + Na+ (aq) + 3H2O(l) → CH3COONa • 3H2O (s)◦ Boil and stir solution of sodium acetate
trihydrate in water until all crystals dissolve and then cool the solution
◦ Drop a small crystal of CH3COONa • 3H2O to initiate nucleation
◦ Reaction goes to ~54oC
Crystallization of CH3COONa 3H2O
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ENDOTHERMIC REACTION2
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Ammonium Nitrate Reaction
NH4NO3(s) + H20(l)→ NH4+
(aq) + NO3-
(aq)
◦ Process involves dissolving ammonium nitrate in water
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Ba(OH)2. 8H2O(s) + 2NH4Cl(s) → 2NH3 (g) + 8H2O(l) + BaCl2. 2H2O(s)
◦ Dissolve 35g Ba(OH)2 & 17g NH4Cl◦ Temperature will decrease to ~ -20oC
←Barium Hydroxide
Ammonium Chloride →
Barium Hydroxide Octahydrate & Ammonium Chloride
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Chemicals UsedMaterial NFPA Rating Bulk Cost Details
Calcium Oxide 3,0,2 1 kg $31 Stockroom
Ammonium Nitrate 0,0,3 1 lb (450g) $10 Amazon
Sodium Acetate 1,1,0 500g $33 Stockroom
Barium Hydroxide Octahydrate 2,2,0 500g $41 Stockroom
Ammonium Chloride 1,0,0 500g $22 Stockroom
TOTAL $ 137
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◦ Control Variables: Amount of chemical (moles or grams)
◦ Recorded Variables: ▫ Plateau temperatures of the reactions (⁰C) ▫ Time it takes to reach plateau temperature (second)
▫ Time it stays at plateau temperature (second)
TESTING STAGE Procedure
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SAFETY OPERATION Procedure
◦ All chemicals are injected into the reactor vessels with syringes at the start of the line.
◦ In case of an emergency, our car can be shut off by an on/off button, which cuts off the electricity of the entire car system.
◦ Chemicals are disposed properly based on their chemical properties and laboratory requirements.
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Questions