Home/ Day 2

Guiding session · ~90 minutes · 22 slides

Green Manufacturing & Sustainable Engineering

A guided walk through Solar PV, Textiles and Electric Vehicles — one life-cycle stage at a time. Every figure sourced & cited.

01 · Opening frame

The smokestack has moved

Fixing one stage often just shifts the impact to another. Only life-cycle thinking names the biggest lever.

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Electric Vehicles

Tailpipe emissions fall to zero — but battery-cell manufacturing becomes the new hotspot. Cell factory: 48–120 kg CO₂e per kWh; can be halved by a renewables-powered grid.

Nature (Peiseler et al., 2024) · Kallitsis et al., 2024

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Textiles

Polyester “saves” cotton water — then sheds microfibres at every wash. Polyester fleece sheds 6× more microfibres per wash than the median garment type.

Gaylarde et al., 2021 · Ocean Conservancy, 2025

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Solar PV

Zero emissions in use — but ~60% of manufacturing electricity is coal (vs 36% global avg). Panel needs 4–8 months of operation to pay back manufacturing emissions.

IEA · Solar PV Global Supply Chains

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Anchor references: UNEP Global Resources Outlook 2024 · OECD Life Cycle Initiative · Ellen MacArthur Foundation — A New Textiles Economy

02 · The scaffold · Pillar 2

Seven life-cycle stages

Product Design added upstream · Upcycling → Circular Economy added downstream — the green-manufacturing extension.

Why it matters: “You cannot recycle your way out of a bad design brief.” (Ellen MacArthur Foundation)

  • Solar: PERC → TOPCon → HJT → tandem; every +1% efficiency lowers lifetime kg CO₂/kWh.
  • Textiles: Mono-material construction almost eliminates the recycling separation problem. Average garment worn <7 times.
  • EV: LFP cuts battery embedded carbon 30–40%; cell-to-pack saves ~10–15% mass per kWh.

Global material extraction has tripled since 1970 and could rise another 60% by 2060 (UNEP GRO 2024).

  • Solar: Siemens ~42–58 kWh/kg-Si; FBR granular ~80–90% less electricity.
  • Textiles: One pair of jeans ~3,781 L freshwater — 68% at the cotton field. Lyocell recovers ~99.8% solvent.
  • EV: DRC ~75% of cobalt; Atacama brines 100–1,000 m³ water/t Li. LFP removes cobalt from the BoM.
  • Solar: Chinese firms ~93.5% of polysilicon capacity; energy payback 4–8 months for 25–30 year life.
  • Textiles: Dyeing ~20% of China’s industrial wastewater; CO₂ dyeing cuts water ~95%. Sector energy −26% (2022→2024).
  • EV: Cell mfg 48–120 kg CO₂e/kWh. CATL Yibin: world’s first zero-carbon battery factory (2022) — 100% renewables.

Share of life-cycle emissions: Solar ~3% · Textiles ~5% · EV ~4%. Localise for resilience, trade policy, and time-to-market — not carbon alone.

  • Solar: Value = carbon intensity of the marginal kWh displaced. Same panel: ~6× mitigation difference coal vs French grid.
  • Textiles: Use phase ~31% of polyester T-shirt CO₂. Cold wash halves use-phase energy; fleece sheds 6× microfibres.
  • EV: EU BEV ~73% lower than gasoline ICE (ICCT 2025). Smart charging off-peak cuts use-phase CO₂ 20–35%.
  • Solar: ~78 Mt PV waste by 2050; advanced routes recover ≥90% of Cu, Ag, glass, Si, Al — economics still catching up.
  • Textiles: <1% clothing → clothing again. EU separate collection mandatory 2025; recycled fibre share 7.6% (mostly bottle rPET).
  • EV: Li-ion recycle rate ~5–10%. Second-life storage: LCOE −12–41%, embodied CO₂ −~30%. EU Battery Regulation sets collection & recycled-content targets.
  • Solar: Recycling could recover materials worth ~USD 8.8 bn by 2050; silver loop could meet ≥70% of demand (IEA NZE 2040–50).
  • Textiles: rPET ~USD 13.3 bn (2024); biological vs technical cycles (EMF butterfly). Fibre-to-fibre for cotton/polycotton is next.
  • EV: CATL-Brunp hydromet: 99.6% Ni/Co/Mn, 96.5% Li. >120,000 t processed in 2024 → 17,100 t Li salts.
Open full 3×7 matrix →

Sector deep dives

Pick a sector · study every stage

1–2 yr
Energy payback
25–30 yr
Panel operating life
4–8 mo
Emissions payback

Take-away

FBR polysilicon + renewable-grid cell plants — both proven at Chinese scale today. Site panels where the grid is dirtiest for maximum mitigation per kWh.

IEA · LONGi · GCL Technology · Fraunhofer ISE · IRENA

80%
Impact locked at design
<1%
Clothing → clothing again
3,781 L
Water per pair of jeans

Take-away

Mono-material + durable + repairable + recyclable — the four-word design brief. Waterless dyeing and closed-loop lyocell already exist; blends are the recycling trap.

EMF A New Textiles Economy · CNTAC · Levi Strauss LCA · SWITCH-Asia

48–120
kg CO₂e / kWh cell mfg
5–10%
Li-ion recycled today
~73%
Lower LC emissions vs ICE (EU)

Take-away

LFP + CTP + renewable cell plants + second-life-before-recycle — the full playbook. “The battery is the new smokestack.”

IEA GEVO · Nature 2024 · CATL Yibin / Brunp · ICCT · EU Battery Regulation 2023/1542

10 · Local anchors · Pillar 3

Every case lives inside a three-hour drive from Chizhou

Anhui’s PV + storage + NEV + bamboo + green-mfg base gives the classroom rare, immediate context.

☀️ Solar PV · Anhui

43.11 GW

Installed 2024 · #8 in China

  • LONGi Hi-MO 7 — ISO 14067 carbon footprint
  • Tongwei — 900 kt/y polysilicon
  • GCL — 269 kt FBR polysilicon (2024)
  • CHN Energy BIPV · Qingyang County, Chizhou — 4.39 MW DC

🧵 Textiles · YRD

−26%

Avg energy intensity 2022→2024

  • Huzhou + Shaoxing — largest YRD apparel cluster
  • SWITCH-Asia MSME circularity pilots
  • Zhejiang Jiaren — rPET-to-fibre
  • Chizhou bamboo — 2 bn straws; low-carbon substitution

🚗 EVs · Anhui auto

¥1.16 tn

Auto industry 2023 · +28.5% y/y

  • CATL Yibin — zero-carbon cell plant
  • BYD — 3.7M NEVs sold 2024
  • Brunp Recycling — 130 kt in 2024
  • NIO Anhui — 2024 Provincial Green Factory

Anhui is China’s #3 in PV + storage; planned ¥97 bn energy-storage build-out. The field trip is already outside the building.

11 · Opportunity headlines · Pillar 7

Fifteen one-liners for the classroom

Take these into your next lecture, proposal, or WeChat post.

Solar PV · The panel pays back in months

01

The energy payback is 1–2 years — the panel lasts 25.

02

Xinjiang coal makes the panel; renewables can too.

03

FBR granular silicon cuts silicon-refining electricity by 80–90%.

04

78 million tonnes of panel waste by 2050 — the recycling industry has to grow now.

05

Every 1% cell-efficiency gain lowers the panel needed per kWh — that’s life-cycle impact.

Textiles · Design or nothing

01

Less than 1% of clothing becomes clothing again — design changes, not recycling lines, will fix that.

02

A pair of jeans drinks ~3,800 litres — mostly at the cotton field.

03

Dyeing is 20% of China’s industrial wastewater — waterless dyeing exists today.

04

One fleece jacket sheds 6× more microfibres than cotton — wash less, wash cold.

05

Mono-material design makes recycling economically possible — blends make it nearly impossible.

Electric Vehicles · The battery is the new smokestack

01

A coal-grid BEV is still cleaner than an ICE; a renewable-grid BEV is dramatically cleaner.

02

LFP cuts battery embedded-carbon by 30–40% — chemistry is a design-stage decision.

03

The battery factory is the new smokestack — renewable-powered cell plants are proven.

04

Global battery recycling is only 5–10% — the second-life + hydromet playbook is ready.

05

Cobalt is 75% from one country — LFP chemistry makes that problem optional, not mandatory.

13 · Day 2 wrap

One frame · three sectors · twenty-one levers

Every sector’s biggest lever is upstream of the point where the impact appears.

Homework 1 · Pick your sector

Choose the sector nearest your home discipline. Read the deep-dive. Bring one question for the next session.

Homework 2 · Fill a cell

Take the 3×7 matrix. Pick one cell and rewrite the dominant lever using your own field’s language.

Homework 3 · Baseline survey

10 questions · ~15 minutes. Re-take at Session 7 to measure your 21-hour gain.

Open 3×7 matrix → Take survey