| Electronics > Projects, Designs, and Technical Stuff |
| Determining heat dissipation of 3D printed box - final results! |
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| HendriXML:
I designed a 3D printed box for a battery (5x1.2V) to 5V regulation circuit. For that circuit I know it has more than enough dissipation power. However I still like to know how much heat can be dissipated, just to get a sense of what happens when you put stuff in a box. To determine this I will use the circuit which was posted here: https://www.eevblog.com/forum/projects/very-stable-temperature-control/msg2514615/#msg2514615 I will use that circuit (Control schematic 1.3.37) and mount the offboard stuff (heating transistors, sensor etc) on a second perfboard (Schematic). The transistors will have the heatsink on them for which the box is designed for. I posted 2 renders of the box, I've used the appearance of wood because it easy on the eye. One of the features of the box is, is that the air slots in the side walls are zig zagged. So nothing straight can be poked trough them. The questions I like to answer are: How much power can be dissipated when the heatsink is at 40 deg. celcius above roomtemp (will be around 60 deg). in the following circumstances: 1) No box 2) Box without top 3) Box with top 4) Box with covered side air slots 5) Box with all air slots covered |
| tunk:
I don't know the answers to your questions, but here is what I would have asked myself: what is the current draw (i.e. power needed to be bled off) and what size of heat sink. Also, what's the size of the box? |
| HendriXML:
The box can contain a 50 mm x 70 mm perfboard and a heatsink of 38 mm height. So it is a small box, mainly for small projects. Will post images of the real stuff as well. |
| tggzzz:
--- Quote from: HendriXML on September 19, 2019, 09:59:40 am ---How much power can be dissipated when the heatsink is at 40 deg. celcius above roomtemp (will be around 60 deg) --- End quote --- How does the box's material properties change when in contact with the heatsink at 60C? |
| HendriXML:
The printed material PLA cannot withstand 60 deg very well. But the heatsink won't be in contact with the plastic. So I will also find out whether the inside of the box gets hot or not. In the covered conditions it will probably be close to that 60 deg. |
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