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Basking in the Light

The first time I came to London I was 5 years old. I’m pretty sure my parents dragged me to all the usual touristy places but I only remember disjointed fragments.

Feeding ducks in Hyde Park.

Sitting on the jump seat in a black cab.

Holding on to my dad with one hand and holding on for dear life to my new bestie, a rather large light-brown teddy bear, while standing outside Hamleys. Come to think of it we must have been quite a sight because I remember hordes of people smiling down at me and me proudly beaming my goofy smile back at them.

And strangely enough I remember the streetlights. Unlike the ones back home, these lights were orange and gave the foggy sky a rather eerie glow. When I returned to London in my 20s, I remember smiling to myself upon seeing the streetlights again. Their orange glow brought back a flood of happy childhood memories.

London on a clear summer night. Image courtesy of N Saye. All rights reserved.

London on a clear summer night. Image courtesy of N Saye. All rights reserved.

Alas my beloved orange lights are disappearing from London streets. They are being replaced with new more powerful and energy efficient LED lights.  According to a recent article from LEDs Magazine, by 2016, the city of London plans on upgrading 35,000 streetlights to LED luminaires. This project will cost the city about £11 million and is expected to reduce emissions by 9700 metric tons annually and save the city £1.85 million. While it’ll take the city a few years to pay back the investment, the ROI is clear.

Since LEDs are temperature sensitive, thermal management of LED streetlights can be quite challenging as illustrated in a recent article titled Simulation Enables Optimum LED Street Light Heatsink Design in LEDs Magazine. That’s why BUCK d.o.o., a company specializing in architectural and medical lighting, uses CFD simulation software. While working on a new streetlight design alongside Panasonic Serbia, the team used FloEFD to answer questions such as

  • How much airflow is needed to take the heat away at 55°C ambient temperature from a 140W high-power LED module?
  • In what way can they provide the optimum heat dissipation surface?
  • Where do the hottest air pockets form?

The article answered all of these questions and more. And as icing on the cake, this luminaire design was deemed so “cool” that it won the Good Design Award from the Chicago Athenaeum Museum of Architecture and Design. To read the article  please follow this link.

As a tech junkie I celebrate new technology. But I can’t help feel a tinge of sadness whenever I see another orange streetlight disappear. You see the light right outside my house was replaced with an LED one without much ceremony a few months ago. While I now feel much safer walking home late at night, I miss laying in bed catching a glimpse of the orange light through my bedroom blinds hoping to remember some long forgotten childhood memory.
Until next time,
Nazita

street light, CFD, ROI, LED, luminaire

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About Nazita Saye

Nazita SayeI have been involved with the CFD user community in one shape or another since 1999 -- when the NIKA team first introduced FloWorks to the engineering community. Over the years I've seen the market evolve and I still marvel at the wide range of products that are being designed with our tools. As the Manager of External Communications for the Mechanical Analysis Division at Mentor, it is my privilege to bring some of our customer stories to you. Visit CFD doesn’t mean Color For Directors

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