Tswj LED teeb lwj nyob rau hauv kaw cov phab ntsa teeb nrog aluminium kub dab dej

Mastering Thermal Dynamics:Kev tswj lub teeb pom kev zoo ntawm LED teeb hauv cov teeb pom kev zoonrog Aluminium Heat Sinks

Hauv kev lag luam teeb pom kev zoo,kev tu lub lumen( ntsuas raws li L70 / L90 lifespan) pob khawm ntawm kev tswj LED hlws ris kub (Tj). Rau IP65+ cov teeb ci ntsa iab- qhov twg cov cua sov ua kom nrawm nrawm nrawm dua -extruded thiab tuag- nrum txhuas cua sov dab dej ua riam phom tseem ceeb. Nov yog yuav ua li cas engineer thermal yeej:

Heat Decay Equation

LED teeb tso zis decays exponentially nrog nce Tj:
Lumen Maintenance (%)=100 × e^(-k·Δt)
Qhov twg:

k=Kub coefficient (0.015–0.025 /℃rau nruab nrab- zog LEDs)

Δt=Tj – 25℃siv

Piv txwv: Ntawm Tj=85℃(Δt=60 degree), decay rate hits6-9% rau 1,000 teevvs.<2% at 55°C.

Battlefield 1: Extruded Aluminium Heat Sinks

Tsim Qhov Zoo:

Fin ntom: Mus txog 8-12 fins / nti ua kom thaj chaw loj tshaj plaws

Continuous Grain StructureThermal conductivity: 160-180 W / m²

Qhov hnyav Efficiency: 30% sib zog dua tuag- nrum ntawm tib lub thermal loj

Optimization Tactics:

Fin Aspect Ratio: Height-to-gap ratio >5: 1 (piv txwv li, 40mm siab / 5mm qhov sib txawv)

Anodization: Dub oxide txheej boosts emissivity rau 0.85 (vs . 0.1 rau liab qab Al)

Kev coj ua: Kev sib cuag ncaj qha ntawm LED MCPCB thiab lub hauv paus dab dej (<0.1°C/W interface)

Case Study:
Lub 50W phab ntsa teeb (Tj=105℃tsis muaj dab dej) poob rau68 degreesiv extruded dab dej nrog:

150mm × 80mm puag

48 fins (qhov siab 35mm, thickness 1.2mm)

25μm anodized txheej
→ Ua tiav L90 @ 60,000 teev

Sib ntaus sib tua 2: Tuag-Ntaus Txhuas Thaum tshav kub kub dab dej

Tsim Qhov Zoo:

Complex Geometry: Sab hauv kab noj hniav rau kev cais tus neeg tsav tsheb

Kev ntseeg ruaj khov: Nrog IK08+ cuam tshuam

Seamless Enclosures: Tshem tawm thermal interface qhov khoob

Optimization Tactics:

Alloy xaiv: ADC12 (2.7 g / cm³) nrog 96 W / m·K conductivity

Rib Design: 3D reinforcement ribs nce thaj tsam 25%

Phase hloov cov ntaub ntawv: Embed PCM capsules (xws li, paraffin) kom nqus tau cov cua sov siab

Case Study:
80W dej nyab teeb nyob rau hauv -30℃txog 50℃ib puag ncig:

Tuag-ntxuav dab dej nrog 4 hli tav + 18% PCM sau

Tj stabilized at72℃± 3 degreeThaum 45℃ambient spikes
→ Lub teeb lwj<3% over 10,000 hours

Yeej Kev Ua Tsov Rog Ib puag ncig

Thermal Interface Materials (TIMs):

Tswv yim Pro: Solder- txuas LEDs txo kev sib tshuam- mus rau - dab dej tsis kam rau0.03℃/ Wvs . 0.5℃/W rau pads.

Convection & Radiation Traps:

Cov nyhuv chimney: Vertical fins tsim 0.2 m / s sab hauv airflow hauv cov teeb kaw

IR Reflections: Txheej sab hauv phab ntsa nrog qis -emissivity zaj duab xis (ε<0.1) to reflect heat toward sink

Predictive Modeling: CFD hauv Kev Ua

Advanced designs siv computational fluid dynamics (CFD) rau:

SimulateKev faib tawm cua sovntawm LED arrays

Txheeb xyuas qhov chaw tuag nrog<0.5 m/s airflow

Optimize fin spacing sivGrashof tus lej(natural convection efficiency):
Gr=(g··ΔT·L³)/ν²
Qhov twg g=gravity, =thermal expansion, L=fin height, ν=kinematic viscosity

Kev tshwm sim: Cov qauv kwv yees Tj nyob rau hauv ± 2℃ntawm tiag-kev xeem hauv ntiaj teb.

5-Point Anti-Decay Protocol

Set Tj Threshold: Keep ≤85°C for L90 >50,000 teev

Xaiv Sink los ntawm Wattage:

Tsawg dua los yog sib npaug rau 30W: Extruded (compact/cost-effective)

30W: Tuag- nrum (stability/complex cooling)

Thov TIMs Judiciously: Solder > grease > pads

Siv Ambient Coupling: Mount dab dej sab nraud yog qhov ua tau

Siv tau nrog LM-80: Xav tau 6,000+ teev cov ntaub ntawv xeem

Xaus: Thermal Victory Formula

Tswj lub teeb lwj hauv cov teeb ci ntsa iab uas xav tau:

[High Conductivity Material] + [Maximized Surface Area] + [Optimized TIM]
= Tj Txo (30–40 degree)
= 2–3 × Ntev Ntev

Los ntawm riam phom aluminium lub thermal zog los ntawm kev tsim ntse, engineers hloov cov khoom sib khi los ntawm kev lwj -nruj ntxiab mus rau kaum xyoo- ua haujlwm ntev. Kev sib ntaus sib tua tiv thaiv lumen depreciation yog yeej micron los ntawm micron, fin los ntawm fin.