http://www.penguinslab.com/peltier.htm
David Jones and Michael Wilcox
Bismuth Telluride cubes carry heat from one direction to the other
Charge comes from DC Voltage
Increase in Voltage => Increase in ΔTAt 12 V => ΔT = 51˚C
Current heat load = 0WThot,spec chart = 35˚C, Tcool,spec chart = -16˚C
Two Peltier Devices connected to stainless steel plates
Coolant runs between radiator and peltier devices.
Coolant is used to keep the Thot down (Troom)Pumped through a fan-cooled radiatorCoolant used for anti-rust, anti-mold, increased
heat dissipation
Stainless Steel used Easily cleanedResistant to RustingHolds Heat WellStainless Steel: k=14.9 W/m*K
Thermal grease used to bridge the gapStainless Steel @10,000 kN/m2, R=.7-4.0 x10-4 m2*K/WThermal grease (@ 3500kN/m2), R=.04 x10-4
m2*K/W
CopperStainless
Measure time constant (τ) to reach steady stateCooling
τ = 86s
Return to Troom
τ = 98.8s
Basic Assumption: 1-D Transient ConductionGoverning Equation: Temperature Distribution:
Additional Assumptions:h = 300 W/(m^2*K)Peltier device neglected, exceptDevice modeled by using
T∞ = Ti - ΔT = -27˚C
Time constant: τ = 89.9s
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