Thermoelectric waste heat recovery on the way to mass production and into applications
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1 Thermoelectric waste heat recovery on the way to mass production and into applications J. König, M. Kluge, K. Tarantik, K. Bartholomé, J. Heuer, J. Horzella, M.Vergez, U.Vetter Fraunhofer IPM, Freiburg, Germany
2 Thermoelectric waste heat recovery on the way to mass production and into applications Content On the way to applications Module Fabrication New Half-Heusler Modules and Arrays Cost Considerations Summary
3 Application Project: ThermoHeusler 2 Automobile with Thermoelectric Generator => ~5 % fuel saving 3
4 Application Project: Thermoelectric CHPs CHP with Thermoelectric Generator => ~3 % improvement in electrical efficiency 4
5 System Design Aspects TE-Module Design and Integration mass-flow, temperature, back-pressure WÜ Heiß Application? WÜ Kalt Coolant flow, temperature, (back-pressure) 5
6 System Design Aspects TE-Module Design and Integration n-conducting TE-leg p-conducting TE-leg conductor pad ceramic substrate hot side ceramic substrate cold side heat flux System design essentials Thermal matching with heat exchangers Electrical matching with load circuit Power management, Voltage conversion,,, 1,,, 6
7 System Design Aspects TE-Module Design and Integration mass-flow, temperature, back-pressure Voltage / current (@ T, T) Number of legs WÜ Heiß Coolant flow, temperature, (back-pressure) WÜ Kalt Heat flux, thermal resistance Height of legs; legs diameter; filling factor 7
8 High Temperature Module Manufacturing Customized Half-Heusler Module designs Module efficiency ~5,4 % (dt~530 K; T hot ~550 C) Tunable Module design parameter: Module geometry: 16 x 16 mm 2 or 20 x 20 mm 2 variable height: 3 5 mm Thermal resistance: K/W ; (dt~490 K; T hot ~550 C) Open circuit voltage: 245 μv/k per unicouple (dt~490 K; T hot ~550 C) => U 0 = ~0,9 V for module with 7 unicouples and dt~490 K; T hot ~550 C 8
9 High Temperature Module Fabrication Manual Module Production Process sintering polishing & dicing electric. brazing connected 9
10 High Temperature Module Fabrication Semi-automated Module Process sintering polishing D= 80 mm & dicing pick & place 10
11 High Temperature Module Fabrication Semi-automated Module Process 11
12 High Temperature Module Fabrication Semi-automated Module Process sintering polishing D= 80 mm & dicing pick & place quality brazing control 12
13 High Temperature Module Fabrication Semi-automated Module Process 2,0 1,8 1,6 Ri [Ohm] 1,4 1,2 1,0 0,8 0,6 0,4 0,2 0,0 Ri mean = 1,75 Ohm Deviation ~ ± 3,5 % <=> Measurement uncertainty # module 13
14 High Temperature Module Fabrication Semi-automated Module Process sintering polishing D= 80 mm & dicing pick & place quality brazing control 14
15 High Temperature Module Fabrication Customized Half-Heusler Module designs Module efficiency ~5,4 % (dt~530 K; T hot ~550 C) Tunable Module design parameter: Module geometry: 16 x 16 mm 2 or 20 x 20 mm 2 variable height: 3 5 mm Thermal resistance: K/W ; (dt~490 K; T hot ~550 C) Open circuit voltage: 245 μv/k per unicouple (dt~490 K; T hot ~550 C) => U 0 = ~0,9 V for module with 7 unicouples and dt~490 K; T hot ~550 C => U 0 = ~5 V for module with 39 unicouples and dt~490 K; T hot ~550 C 15
16 High Temperature Module Fabrication Performance of Half-Heusler Modules Electrical Power output of a new high temperature Half-Heusler Module (1.6 x 1.6 cm 2 ) 5 4 M1 T cold ~ 20 C M2 T cold ~ 60 C M3 T cold ~ 80 C Pmax [W] Delta T [K] 16
17 High Temperature Module Fabrication Reliability of Half-Heusler Modules Thermal shock testing at Faurecia ECT T H = 550 C <-> 20 C T C = 20 C >1,000 Cycles in Air No significant degradation! 550 C 20 C min. 17
18 High Temperature Module Fabrication Half-Heusler Module Arrays 2 x 2 Module Array Interconnection of 4 modules = 32 mm x 32 mm 156 unicouples => High voltage 1.46 W/cm ΔT = 530 K, T hot = 550 C ΔT = 530 K, T hot = 550 C 15 TeWaB_027_M01 heating TeWaB_027_M01 cooling 20 TeWaB_027_M01 heating TeWaB_027_M01 cooling Pmax [W] 10 5 U0 [V] Delta T [K] Delta T [K] 18
19 High Temperature Module Fabrication Half-Heusler Module Arrays 2 x 2 Module Array 8 7 Ri (Ohm) Ri mean ~ 7 Ohm Deviation ~ ± 3,5 % <=> Measurement uncertainty # module array (2x2) 19
20 High Temperature Module Manufacturing Half-Heusler Module Arrays Project: Thermoelectric CHPs 20
21 High Temperature Module Manufacturing Half-Heusler Module Arrays Interconnection of 40 single modules 21
22 Thermoelectric waste heat recovery on the way to mass production and into applications Content On the way to applications Module Fabrication New Half-Heusler Modules and Arrays Cost Considerations Summary
23 Cost Considerations Thermoelectric system (TEG) cost allocation K. Salzgeber (AVL), et al., JEMS, Vol. 39, No. 9, 2010 DOI: /s y Dr. Cédric de Vaulx et al. TRA2014, Paris April
24 Cost Considerations Thermoelectric system (TEG) cost allocation Electronics TEM (thermoelectric module) TEG Unit assembly TE Material TEG Unit Semi-finished parts K. Salzgeber,( AVL) et al., JEMS, Vol. 39, No. 9, 2010 DOI: /s y Cost split for a TEG Unit designed for gasoline engines for Hybrid electrical vehicles (Cost assessment for mass production) 24
25 High temperature modules made by Fraunhofer IPM Material class Material availability Power density (module) [W/cm 2 ] [W/g] Module efficiency Pros / Cons Lead telluride >kg 0.5?? + high ZT - contains Pb + Te Silicides kg % + low density + good n-type - capsulation needed - poor p-type Skutterudites Half- Heuslers >kg % >kg % + high ZT + high reproducibility - capsulation needed - mechanical stability + stable + high reproducibility -Contain Hf 25
26 Cost Considerations Hf-based Half-Heusler Modules Raw material costs (2016) p-type n-type 226 /kg 262 /kg => Hf- free Half-Heuslers 26
27 Cost Considerations Hf-free Half-Heusler Modules Benjamin Balke, ECT 2016,
28 Cost Considerations Hf-free Half-Heusler Modules (p) (n) (n) (p) Cost reduction of Half-Heusler raw materials by >90%!!! Benjamin Balke, ECT 2016,
29 High temperature modules made by Fraunhofer IPM Material class Material availability Power density (module) [W/cm 2 ] [W/g] Module efficiency Pros / Cons Lead telluride >kg 0.5?? + high ZT - contains Pb + Te Silicides kg % + low density + good n-type - capsulation needed - poor p-type Skutterudites Half- Heuslers >kg % >kg % + high ZT + high reproducibility - capsulation needed - mechanical stability + stable + high reproducibility 29
30 Cost Consideration Based on commercially available Bi 2 Te 3 modules Module commercial Bi 2 Te 3 Half-Heusler Raw material costs (2016): ~ 44 $/kg $/kg (Hf-free) Synthesized material costs ~ 300 $/kg <=> 300 $/kg possible!? 3-5 kg batch synthesis by THM in mass production > 8 kg batch synthesis realized >> 8 kg possible 30
31 Cost Considerations Thermoelectric system (TEG) cost allocation Electronics TEM (thermoelectric module) TEG Unit assembly TE Material TEG Unit Semi-finished parts K. Salzgeber,( AVL) et al., JEMS, Vol. 39, No. 9, 2010 DOI: /s y Cost split for a TEG Unit designed for gasoline engines for Hybrid electrical vehicles (Cost assessment for mass production) 31
32 Cost reduction Thermoelectric Downsizing 50 % material reduction without changing the module properties like - thermal resistance - electrical resistance Possible due to the very good mechanical properties of Half-Heusler materials (Bi 2 Te 3 is very brittle -> not possible) 32
33 Cost Considerations Thermoelectric system (TEG) cost allocation Electronics TEM (thermoelectric module) TEG Unit assembly TE Material TE Module fabrication TEG Unit Semi-finished parts K. Salzgeber,( AVL) et al., JEMS, Vol. 39, No. 9, 2010 DOI: /s y Cost split for a TEG Unit designed for gasoline engines for Hybrid electrical vehicles (Cost assessment for mass production) 33
34 Cost reduction due to mass production fully automated production process is possible sintering polishing & dicing pick & place quality brazing control 34
35 Cost Considerations Thermoelectric system (TEG) cost allocation Electronics TEM (thermoelectric module) TEG Unit assembly TE Material TE Module fabrication TEG Unit Semi-finished parts K. Salzgeber,( AVL) et al., JEMS, Vol. 39, No. 9, 2010 DOI: /s y Cost split for a TEG Unit designed for gasoline engines for Hybrid electrical vehicles (Cost assessment for mass production) 35
36 Cost Consideration Based on commercially available Bi 2 Te 3 modules Module commercial Bi 2 Te 3 Half-Heusler Raw material costs (2016): ~ 44 $/kg $/kg (Hf-free) Synthesized material costs ~ 300 $/kg <=> 300 $/kg possible!? 3-5 kg batch synthesis by THM in mass production > 8 kg batch synthesis realized >> 8 kg possible mass production of thermoelectric modules (TEM) possible: > TEM (40x40 mm 2 ) 1-4 $/TEM 36
37 Cost Consideration Based on commercially available Bi 2 Te 3 modules Module commercial Bi 2 Te 3 Half-Heusler Raw material costs (2016): ~ 44 $/kg $/kg (Hf-free) Synthesized material costs ~ 300 $/kg <=> 300 $/kg possible!? 3-5 kg batch synthesis by THM in mass production > 8 kg batch synthesis realized >> 8 kg possible mass production of thermoelectric modules (TEM) possible: > TEM (40x40 mm 2 ) 1-4 $/TEM 5 $/TEM realistic* P out, peak / TEM (40x40mm 2 ) 4-9 W W shown => ~1-0.5 $/W ~0.25 $/W * *assumption: TEM fabrication process for Half Heusler similar to Bi 2 Te 3 TEM fabrication 37
38 Cost Considerations Thermoelectric system (TEG) cost allocation Electronics TEM (thermoelectric module) TEG Unit assembly ~ 0.25 $/W TEG Unit Semi-finished parts K. Salzgeber,( AVL) et al., JEMS, Vol. 39, No. 9, 2010 DOI: /s y Cost split for a TEG Unit designed for gasoline engines for Hybrid electrical vehicles (Cost assessment for mass production) 38
39 Thermoelectric waste heat recovery on the way to mass production and into applications Content On the way to applications Module Fabrication New Half-Heusler Modules and Arrays Cost Considerations Summary
40 Summary Achievements: Custom designed Half-Heusler modules with high power densities made of kg-batch material Fabrication of Half-Heusler modules with high reproducibility and reliability is possible Semi-automated fabrication of Half-Heusler modules demonstrated Mass production of Half-Heusler modules is possible Cheap Half-Heusler modules possible in mass production!!! Fraunhofer IPM provide Half-Heusler-modules for prototype systems 40
41 High Temperature Module Manufacturing Customized TE-Module designs TEM Properties Unit IPM-Type 1 IPM-Type 2 IPM-Type 3 IPM-Type 4 IPM-Type 5 TE module dimensions base area [mm 2 ] 16±0.5 16±0.5 16±0.5 16±0.5 16±0.5 16±0.5 16±0.5 16±0.5 16±0.5 16±0.5 height [mm] 5.0± ± ± ± ±0.15 weight (without wires) [g] ~4 ~3 ~3 ~2 ~4 number of thermocouples wire with thermal isolation ~80 mm long Internal resistance at room temperature (without wires) [#] mm long; blue: minus, red: plus [Ohm] 0.04± ± ± ± ±0.1 Following module properties were achieved under the conditions ΔT ~530 K; T hot ~550 C; T cold ~20 C; p con = 2 MPa, atmosphere: nitrogen thermal resistance (K th)* [K/W] ~9 ~7 ~7 ~9 ~8 open circuit voltage (U 0) [V] 1.0± ± ± ± ±0.5 internal resistance (R i) [Ohm] 0.07± ± ± ± ±0.1 power (P max) [W] 3.1± ± ± ± ±0.3 efficiency (η)* [%] ~5.3 ~3.2 ~4.6 ~5.1 ~5.3 * calculated data 41
42 Acknowledgment RexTEG thermoheusler thermoheusler 2 Funded by the "Innovationsfonds Klima- und Wasserschutz" by badenova AG & Co.KG 42
43 Thanks! 43
44 Good ideas for better solutions Thank you for your attention! Contact Visit us on the Internet at 44
45 Cost reduction Optimization of module geometry Idea: thermoelectric downsizing Reduce amount of TE material while keeping thermal and electrical properties of TE module electrical resistance of TE module: thermal resistance of TE module: 1 1 Identical scaling k of L and A leaves thermal and electrical properties of module unaltered! 45
46 High Temperature Module Manufacturing The Half-Heusler Alloys (>kg production) 1,0 n-type n-(zr 0.4 Hf 0.6 )Ni(Sn 0.98 Sb 0.02 ) 1,0 p-(zr 0,5 Hf 0,5 )Co(Sb 0,8 Sn 0,2 ) p-type 0,8 n-type Sample Literature data (Yu et al. Acta Materialia 2009) 0,8 p-type Sample Literature data (Yan et al., Nano Letters, 2011, Ingot) 0,6 0,6 ZT ZT 0,4 0,4 0,2 0,2 0, temperature [ C] Data in very good agreement with literature *,** 0, temperature [ C] Good reproducibility of material properties in >kg production (typically ~10% deviation from batch to batch) *C. Yu, T.-J. Zhu, R.-Z. Shi, Y. Zhang, X.-B. Zhao and J. He, Acta Materialia 57 (9), (2009). **X. Yan, G. Joshi, W. Liu, Y. Lan, H. Wang, S. Lee, J.W. Simonson, S.J. Poon, T.M. Tritt, G. Chen, Z.F. Ren, Nano Letters, 11 (2011)
47 Thermoelectricity Performance of commercial Bi 2 Te 3 module Performance data of a commercial TEG (4x4 cm 2 ) up to hot side temperatures of 250 C THot 200 C THot 175 C THot 150 C THot 125 C THot 100 C Cold side temperature [ C] 47
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