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  1. #91
    BobL is online now Member: Blue and white apron brigade
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    Quote Originally Posted by BaronJ View Post
    Hi Bob,

    Have you thought about the insulation that is used on the walls of camper vans ?

    Its a 5 mm thick synthetic foam rubber that is self-adhesive on one side and a 2 mm thick metallised plastic bubble bonded onto the other. Its rated to 150 C. I've loads of it from when I did my van, I'll take a picture later.

    One thing that I will say is that once you have stuck it on it doesn't come off easily, even with the heat of direct sunlight on the van walls.
    Thanks.

  2. #92
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    Hi Bob,

    Some pictures of the insulation I referred to earlier.

    I used this stuff on all the walls, roof and floor of the van and then did the lining out with plywood and wool carpet. It really keeps the heat out and suppresses the noise from outside. Net result is a cool van when its hot outside and nice and cosy when it gets cold.

    30-09-2019-2.JPG 30-09-2019-1.jpg 30-09-2019-3.JPG
    It is 8 mm thick overall, with a strong adhesive on one side that grabs on contact, so you do have to be careful when applying it. The other side is a layer of nitrogen filled plastic bubbles with a metallised plastic film glued on top. The idea is that it reflects the heat or cold back into the van. Its rated to withstand 150 C.
    Best Regards:
    Baron J.

  3. #93
    BobL is online now Member: Blue and white apron brigade
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    Thanks for the info. It looks like the van insulation would be perfect for the sides but I am less concerned about the sides as I am about the top which unfortunately has a much smaller gap. Some of the gaps at the top are 5mm or even less so I would have to cut around these spots. This is why I went for the thin (~1mm) silicone sheet. So far it seems to be doing its thing and has stabilised the temp enough for my liking for the moment. There are still the odd temperatures fluctuationsthat cannot be explained by the usual boiler cycling but I have moved onto another coffee related project which I will post about as soon as I have something to show.

  4. #94
    BobL is online now Member: Blue and white apron brigade
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    Coffee machine is going well but here I'm reporting on a coffee related experience that coffee nerds may be interested in.

    Today my uber coffee nerd mate arranged for us to get access to a "coffee lab" containing a wide range of coffee making equipment and testing gear to test out some of our ideas. The lab is owned by a major roaster that my mate used to work for. To give you an idea of the gear involved the coffee machine we were using was a 3 group head Synesso ( $20k+) the grinder was an automated Mazzer Robur Electronic (~$3), and the auto tamper was was about $2k. With all this gear being able to be automated we could consistently fix some variables to be automatically reproduced and could then test, for example, the overall extraction using a Coffee specific Total Dissolved Solids (TDS) meter ($1.5k).

    We were given a bag of fresh coffee and spent over 2 hours making about 2 dozen coffees. The coffee was all ground the same way and weighed into the portafilter using digital scales. The coffees all looked amazing to me but all bar 2 coffees ended up down the sink as I had already had 3 double shots before arriving and we were served a different coffee on arrival.

    Today was just a play around day to get a handle on the gear for future testing of some other ideas. One thing we check out was how the extraction (amount of coffee extracted) depended on tamper force and it turns out it is not dependent on tamping pressure at all. In fact "no tamping at all" and just a level filter basket produces the same extraction as coffee tamped with 30kg force. We also checked out the reproducibility of the TDS meter - it reads to 0.01% but the reproducibility is something like about 0.3% extraction for typical extractions of 20%. Not as good as we hoped for but it should be enough for what we want to do.

    Taste interpretations are of course a a different matter but we don't get too much into that. It's basically good, so-so or not good.

    We are going back again in a couple of weeks once we decide what else we are going to test. I will try to remember to takes some photos next time

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