This is a challenge issued by friends and family. The goal here is to make a robot that can bring beverages from another area to wherever the people are , allow the person to get their drink , then leave. It does not need to be fully autonomous , even remote control is acceptable. It does not need to grab them from the fridge, preloaded beverages are acceptable. This is Ez Robot though, I believe we could do better than that! Well anyways to start the project off I am using a roomba base. I picked up a stainless steel trash can last night as a outside casing. I will show you the rest as we go
By jstarne1
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Ok first test is completed. The thermometer does not show a significant difference in internal temp verses outside. I'm going to do some research here but my first impression is the Peltier is too low power or bad. It does get one size warm but not hot like you would expect something that's 38 degrees hotter than the surrounding temp. I will find some examples and maybe videos and see others experience and choose the next step from here.
The first option for replacement is this 154 watt model at 15.4 volts for 10 dollars or less however I found another unit that is 50mm x 50mm just slightly larger but is a 254 watt model at 15.4 volts. It is $45 http://www.frozencpu.com/products/2408/exp-01/245W_Potted_Peltier.html?tl=g30c105&id=dXF2NVas
Some measurement is needed to see if the 50mm version would fit. If it would I may go that route. Otherwise I will stick with the 154 watt version. I looked up different DIY videos for electric coolers around the same volume which were all plastic and foam based with a large heatsinks. The example videos showing the inside and outside temp were working very well so I believe my Peltier must be damaged. I'm also considering runing the whole thing at 17 volts from the -5 and 12+ rail paralleled to get the most out of the fans. That's 1.6 volts over the the rating but there is always some voltage drop under load so it shouldn't be much more load on the Peltier.
That's too bad about the peltier. I know you'll get it done by hook or crook.
When I get home I'm going to unscrew the heat transfer block to make sure it was pressed together. It was a tight fit but I'm just going to double check. I also must add a ventalation fan or two in the back for the heat to escape. Then I will test again. I'm convinced moving up to a nicer Peltier is the way to go though. Thanks for the support troy , it's super frustrating when equipment gives you a problem.
Tell me about it Josh! LOL You always figure it out in the end though.
Sorry for the lack of updates , I picked up a infection from a wisdom tooth that broke. So I been in agony. In my boredom after the meds kicked in I started going over the setup and flaws. One of the things I noticed is though the hotside fan worked the bottom on the chiller didn't have a good way for the hot air to escape. So I'm adding an exhaust fan in the back 120mm silent fan just like the first two. I really didn't like how drilling looked to make a vent so I repurposed a speaker grill as a large van vent. Once the fan is in place it should have no problem pushing the hot air out the back.
Second problem is that the lid was not air tight or insulated. So those two will be addressed. Reading in forums I came accross info stating the arctic silver thermo paste I was using won't work on the cold side because it needs heat from a cpu to cure. So I may swap that for thermal grease that does not need to cure.
Lastly it wouldn't hurt to up the power on the chiller with a newer unit which I posted previously.
My mouth and head is throbbing so I'm done for the night.
Sorry to hear that buddy. Get well soon.