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--- projects:vacuum_drier:work_logs:3_second_try [2022/10/28 03:45] – tjhowse
+++ projects:vacuum_drier:work_logs:3_second_try [2022/10/28 07:02] (current) – tjhowse
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 I disassembled the pump to try to work out whether it had been damaged by running with insufficient oil. I couldn't find any significant damage inside, just a bit of wear. I think the motor has a thermal cutout, as it started up again by itself after a short time of being off.
+{{:projects:vacuum_drier:work_logs:pasted:20221028-035748.png}}
+The pump, disassembled.
+{{:projects:vacuum_drier:work_logs:pasted:20221028-034857.png}}
+The food in the chamber when the pump failed. We fed it to the possums.
 ===== Tangent =====
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 Safer than it looks.
-I don't want to die from electricity, so I don't want to run 240VAC into the vacuum chamber. I don't think much IR would transmit through the 15mm transparent plastic on the top of the vacuum chamber.
+I don't want to die from electricity, so I don't want to run 240VAC into the vacuum chamber. I could shine the light down from above, but I don't think much IR would transmit through the 15mm transparent plastic on the top of the vacuum chamber.
 I had good success with some nichrome wire. Ideally I could build some kind of rack system that interspersed layers of food and heating elements.
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 Giving off lots of IR.
+Building this IR heating system would take too long to implement before my dry ice disappeared. Maybe next time.
+===== Success! =====
+Once I'd rebuilt the pump and got everything up and running again I put in some 10mm thick mango slices and ran it overnight. The result was delicious vacuum-dried mango slices!
+{{:projects:vacuum_drier:work_logs:pasted:20221028-035147.png}}
+Foamy, crunchy texture.
+The texture was definitely crispier on the bottom, where the food could absorb heat from the pot. The top side was chewier, more like sun-dried food.
+{{:projects:vacuum_drier:work_logs:pasted:20221028-035319.png}}
+I weighed the cold trap afterwards and it held 105g of water. I did not weigh the fruit before I put it in, or after I took it out. That would've been helpful.
+===== Future =====
+The next step is working out how to get heat into the food uniformly and in a controlled way. I essentially need a toaster inside the vacuum chamber. A rack to hold the food and heating elements to radiate IR onto it.
 ===== Videos =====
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