Hi, Good job with this sample simulation. I have used CFD in the past but I will be using the SolidWorks thermal simulation going forward. Looking forward to learning this as fast as I can....
Hi Rohit, Thanks for the tutorial, I found it very informative. I'm currently trying to establish and verify a process of analysing the thermal performance of COB LED's with various heatsink designs. I have been able to prototype a heatsink to test with a LED in a thermostatic chamber as a way of verifying the simulation. My current issue is that the simulation is producing results wildly different to values to our real world test (~20 kelvin). If using a volumetric heat source, I have to reduce the thermal watts to approximately 30% of the LED's wattage. Whereas in reality that should be closer to 70% (rule of thumb for LED). And similarly if using a two-resistor component. My question to you is, what other variables should I investigate as potential causes for throwing results out. Cheers.
Would this scenario work to model if a heatsink was good enough for a LED like the Cree XLamp CXB3070 for example? Or would you get a better result if you modelled the COB and its mount and the interface between with the thermal pad etc?
I would rather prefer to use two resister component for modeling led. If you are using volumetric heat source the use proper volumetric heat source by diving the wattage by the volume of led hope it helps.... Good luck
I am trying to work out what heat-sink I need to mount two flat strips of 6 LED's each on their own MCPCB. The kit comes with a sticky thermal pad but no heat-sink. Supplier says to just stick the two boards to a piece of flat Al with same dims as the board at 5mm thick. I want to run a sim to make sure I get adequate cooling with that set-up, i.e. running the LED's at their binning temp of 85 degC. The boards are 294X20mm and each has 6 x Cree XP-L LED's. Two board are connected in series running at 1400mA. Each LED runs at 4.244 W. The Term Resistance of the LED's is 2.2 degC/W. Supplier says thermal performance of the PCB is approx. 2 W/mK. Not sure how to set this sim up?? Product Link is here:www.cutter.com.au/proddetail.php?prod=cut3266
Hi there thanks for the video, I have a doubt regarding the initial material you choose.When you select aluminium as the default material it seems also the LED has been assigned as an aluminium. Is that true?
I have a question about junction to board resistance value? does it readily available in led data sheet or we need to calculate? if available, can you please show?
Rohit Thanks for this Video, i have a question about LED Thermal Case and Borad Temperature not showing in LED data sheet Also board temperature related to MCPCB .How can i find please suggest
HI Varun, If relevant data is not available in data sheet, then you can contact to the manufacture for the required data of you can calculate the approximate data by taking the temperatures from experiments and then use the same for analysis....Good Luck.
Some datasheet have resistor of between case and junction. But generally have not resistor of between board and junction. I have a question. I dont understand point of case. Is it solder point?
Sirikit Joshi Hi, if it is forced circulation problem then you have to calculate pressure at the walls of the tank using forced circulation equation and then apply that pressure on the walls. This way you can continue with the problem
Uhm I don't think so. It's an open tank with a shaft and impeller for stirring purposes. And I need to calculate the force being applied on the impeller blades when it moves through the water to see if how much it deflects. What I am having problem with is how to calculate the force that is applied by the water towards the impeller blades.
Brilliant - thank you so much for this walk-through - it was both clear and well paced. I feel confident I can achieve this.
Hi,
Good job with this sample simulation. I have used CFD in the past but I will be using the SolidWorks thermal simulation going forward. Looking forward to learning this as fast as I can....
Best I've seen so far
Hi Rohit,
Thanks for the tutorial, I found it very informative.
I'm currently trying to establish and verify a process of analysing the thermal performance of COB LED's with various heatsink designs. I have been able to prototype a heatsink to test with a LED in a thermostatic chamber as a way of verifying the simulation.
My current issue is that the simulation is producing results wildly different to values to our real world test (~20 kelvin). If using a volumetric heat source, I have to reduce the thermal watts to approximately 30% of the LED's wattage. Whereas in reality that should be closer to 70% (rule of thumb for LED). And similarly if using a two-resistor component.
My question to you is, what other variables should I investigate as potential causes for throwing results out.
Cheers.
Would this scenario work to model if a heatsink was good enough for a LED like the Cree XLamp CXB3070 for example? Or would you get a better result if you modelled the COB and its mount and the interface between with the thermal pad etc?
I would rather prefer to use two resister component for modeling led. If you are using volumetric heat source the use proper volumetric heat source by diving the wattage by the volume of led hope it helps.... Good luck
I am trying to work out what heat-sink I need to mount two flat strips of 6 LED's each on their own MCPCB. The kit comes with a sticky thermal pad but no heat-sink. Supplier says to just stick the two boards to a piece of flat Al with same dims as the board at 5mm thick. I want to run a sim to make sure I get adequate cooling with that set-up, i.e. running the LED's at their binning temp of 85 degC. The boards are 294X20mm and each has 6 x Cree XP-L LED's. Two board are connected in series running at 1400mA. Each LED runs at 4.244 W. The Term Resistance of the LED's is 2.2 degC/W. Supplier says thermal performance of the PCB is approx. 2 W/mK. Not sure how to set this sim up?? Product Link is here:www.cutter.com.au/proddetail.php?prod=cut3266
I don’t have the electronic package for 2 resistor component , what the most appropriate thermal conductivity or material can I use for LED?
Is via hole of PCB important? anc cupper way etc?
Hi there thanks for the video, I have a doubt regarding the initial material you choose.When you select aluminium as the default material it seems also the LED has been assigned as an aluminium. Is that true?
That's good
I have a question about junction to board resistance value? does it readily available in led data sheet or we need to calculate? if available, can you please show?
Hello, can you share a downloadable link of the data?
can you share a downloadable link of the bulb.sldprt??
Thank you!
Rohit Thanks for this Video, i have a question about LED Thermal Case and Borad Temperature not showing in LED data sheet
Also board temperature related to MCPCB .How can i find please suggest
HI Varun,
If relevant data is not available in data sheet, then you can contact to the manufacture for the required data of you can calculate the approximate data by taking the temperatures from experiments and then use the same for analysis....Good Luck.
Some datasheet have resistor of between case and junction. But generally have not resistor of between board and junction. I have a question. I dont understand point of case. Is it solder point?
Thanks
Hi I'm trying to use flow simulation to see the flow of water in a tank when it is agitated. Can you give me any pointers for how to do that?
Sirikit Joshi Hi, if it is forced circulation problem then you have to calculate pressure at the walls of the tank using forced circulation equation and then apply that pressure on the walls. This way you can continue with the problem
Uhm I don't think so. It's an open tank with a shaft and impeller for stirring purposes. And I need to calculate the force being applied on the impeller blades when it moves through the water to see if how much it deflects. What I am having problem with is how to calculate the force that is applied by the water towards the impeller blades.
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