Dr. HoSungLee

1

Thermal Design ExamplesHeat Sinks

Thermoelectric coolers and generators

Heat Pipes

Compact Heat Exchangers

Solar Cells

2

Heat Sinks

3

Thermoelectric Generators and Coolers

4

p

n

p

n

np

p

pn

Positive (+)

Negative (-)

Heat Absorbed

Heat Rejected

Electrical Conductor (copper)Electrical Insulator (Ceramic)

p-type Semiconcuctor

n-type Semiconductor

Thermoelectric Generator

5

Heat Pipes

6

Compact Heat Exchangers

7

Solar Cells

8

Sun-tracking panels

9

10

Solar Thermoelectric Generator (STEG)

11

Solar Thermoelectric Generator

12

KusatsuHot-springs TEG System

13

1950s

2012

Thermoelectric Modules (old & modern)

Kerosene lamp and radio

14

15

16

17

Thermoelectric Cooler Module

p

n

p

n

np

p

pn

Positive (+)

Negative (-)

Heat Absorbed

Heat Rejected

Electrical Conductor (copper)Electrical Insulator (Ceramic)

p-type Semiconcuctor

n-type Semiconductor

System Designers having difficultiesMost of manufacturers do not provide the material properties

18

Thermoelectric Modules

19

Solar Thermoelectric Generator

Nature Materials 10, 532-538 (2011)

20

Thermoelectric Heat Exchanger

21

Thermoelectric Heat ExchangerThis study investigates the feasibility of integrating thermoelectric devices into a large-capacity liquid heat exchanger (up to 100 kW). Typically, thermal-electrical conversion is inefficient and thermoelectrics are only used in low-power applications (

HYBRID SOLAR PANEL DIAGRAMHYBRID SOLAR PANEL DIAGRAM The hybrid solar panel that Yin designed has as its outermost layer a clear protective cover, followed by a layer of thermoelectric material, a layer with plastic tubes (called the functionally graded material interlayer) to carry water that will cool the other layers while also carrying away heated water, and a bottom layer of reinforcing plastic.Image: COLUMBIA UNIVERSITY

23

Air-to-Air Thermoelectric Heat Exchangers

BSST's parent company, ships more than

1.2 million thermoelectric Air to Air

devices to automobile seat manufacturers

annually, making possible the cooled and

heated car seats available on many car

models. Building on this technology and

manufacturing expertise, BSST has created

Air to Air devices that provide electronic

enclosure cooling at nearly double the

efficiency of standard thermoelectric

cooling devices.

24

Air-to-solid Thermoelectric Heat Exchangers

25

Liquid-to-air Thermoelectric Heat Exchanger

BSST's uniquely designed Liquid to Air

systems allow for significant cooling

power in a variety of form factors. In a

typical BSST configuration, ambient air

enters the device and is instantly chilled to

approximately 15 degrees Celsius. The air

is then blown over electronic systems or

critical components. The waste heat from

the process is removed by the liquid loop

(typically water, but other fluids can be

used).

26

Cold Plate Cooler

27

Bio-medical ExperimentTwo-Temperature Reference TEC

28

Microprocessor Cooling (160W)

29

Miniature Thermoelectric Coolers

30

Thermoelectric Cooler for Telecom Laser

31

Butterfly Package for Telecom Laser

32

Butterfly Package for Telecom Laser

33

Dimensions for Butterfly Package

34

Butterfly Package for Telecom LaserSmall sized

Relatively low price

Long lifetime

35