projects:vacuum_drier:work_logs:2_first_try
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projects:vacuum_drier:work_logs:2_first_try [2022/10/18 05:21] – tjhowse | projects:vacuum_drier:work_logs:2_first_try [2022/10/18 06:43] (current) – [Attempt 3] tjhowse | ||
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Mark 2. | Mark 2. | ||
- | After a few false starts I managed to get the leakage under control. I pre-chilled the second batch of ice cream by putting it in the esky with the dry ice, rather than in the cold bath, to reduce the chance of contamination by methylated spirits. I bought a fresh bag of water ice and packed it around the food chamber, and sprinkled some salt into the ice to lower the melting point. I left it in the ice bath an hour or so until the surface of the ice cream began to develop a kind of foamy, crusty appearance. | + | After a few false starts I managed to get the leakage under control. I pre-chilled the second batch of ice cream by putting it in the esky with the dry ice, rather than in the cold bath, to reduce the chance of contamination by methylated spirits. I bought a fresh bag of water ice and packed it around the food chamber, and sprinkled some salt into the ice to lower the melting point. I left it under a vacuum |
- | I left this setup running overnight. | + | In the morning I found the ice cream entirely melted, and the pressure at about 0.4 atmospheres. |
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This would be the last attempt, as I was nearly out of dry ice. I pre-chilled about four strawberries and a dozen raspberries, | This would be the last attempt, as I was nearly out of dry ice. I pre-chilled about four strawberries and a dozen raspberries, | ||
- | After a few hours the cold trap was at around -50°C. I assumed it would not be able to do its job anymore so I shut it down and disassembled the cold trap. | + | After a few hours the dry ice was gone and the cold trap was at around -50°C. I assumed it would not be able to do its job anymore so I shut it down and disassembled the cold trap. |
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The cold trap was full of feathery frost and solid ice! Exactly as I'd hoped. This confirmed that the cold trap was at least kinda working. | The cold trap was full of feathery frost and solid ice! Exactly as I'd hoped. This confirmed that the cold trap was at least kinda working. | ||
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+ | Berry sludge. | ||
I ate some of the strawberries, | I ate some of the strawberries, |
projects/vacuum_drier/work_logs/2_first_try.1666070475.txt.gz · Last modified: 2022/10/18 05:21 by tjhowse