"RamblinRover Luxury-Yacht" (ramblininexile) 02/26/2019 at 09:41 • Filed to: shitposting

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random001 > RamblinRover Luxury-Yacht 02/26/2019 at 09:45

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How did you get this recording of me?

Nibby > RamblinRover Luxury-Yacht 02/26/2019 at 09:46

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HondoyotaE38: A Japanese and German Collab...wait a minute > RamblinRover Luxury-Yacht 02/26/2019 at 09:58

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themanwithsauce - has as many vehicles as job titles > RamblinRover Luxury-Yacht 02/26/2019 at 10:08

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RamblinRover Luxury-Yacht > random001 02/26/2019 at 10:43

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I’m trying to cleverly come up with a physical design for something that works better than what we have... while being asked to make some thermodynamic calculations regarding condensate, and then to put appropriately absolving blather on a drawing.

None of the three centers of my brain involved are cool with it.

random001 > RamblinRover Luxury-Yacht 02/26/2019 at 11:00

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That....sounds like an amazing problem that I would like to work on.

Urambo Tauro > RamblinRover Luxury-Yacht 02/26/2019 at 11:17

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This could be an appropriate reaction to so many things right now.

RamblinRover Luxury-Yacht > random001 02/26/2019 at 11:30

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Two problems. t he physical design is for an insulated door that’s cheaper and easier to make than what would otherwise be typical, because welding cost needs to come down and the glass pane needs to be easier to replace. As for the thermo, a conditioner is running at 50C, and extremely high humidity. (Dewpoint about 46C). The question is, roughly, what the insulation on 4' of flex duct either side of it would need to equal to make condensate *unlikely* in the flex duct.

The working numbers are that it is spec’ed for operation between 250cfm and 400cfm, and an ambient of down to 65F, so the heat loss calc for R12 (double-layer) flex at that length gets compared to what it would take to get 10% of the minimum airflow down to the dew point. Because if the flow is developed at all, there will be cold spots, and if we’re using a traditional duct calculation (average temp drop) and all of the flow is down to condensing temp on average, we’re beyond fecked. This way we have a margin of safety. Also for safety , not taking into account latent heat of evaporation, because if there’s any condensing happening at all, we’re fecked, because the unit has to run 24/7 for months at a time, largely unmonitored.

So, it’s mostly a calculation of how much heat loss it takes to cool that much air (wet air, mind you!) to the point that we worry, assuming worst case ambient temp, lowest blower rate, very small amounts of cooling airflow as a problem, etc. Making sure also that we have a high enough overall margin of safety that temp drops in an 8'x8' insulated panel room won’t be enough that the air will condense in the return from only having to drop half as far to condense.

Funny enough, the room walls sweating like a bastard is kind of the opposite of a problem for the flex duct , because it means drier air coming back...

RamblinRover Luxury-Yacht > Urambo Tauro 02/26/2019 at 11:33

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Generic “Monday: the sequel”.

random001 > RamblinRover Luxury-Yacht 02/26/2019 at 12:03

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All of it.  All the insulation.

RamblinRover Luxury-Yacht > random001 02/26/2019 at 12:09

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Yes, this is the making-a-room-into-a-pressure-cooker paradigm, and we’re merely trying to prevent hot water from dribbling onto people’s necks... and/or soaking through the insulation on top... and so on, and so on.

My note didn’t quite say “IF YOU DON’T USE MAXIMUM INSULATION YOU DESERVE WHATEVER HAPPENS”, but I guess that was sort of hinted.

pip bip - choose Corrour > RamblinRover Luxury-Yacht 02/27/2019 at 03:55

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have you been talking to people i work with?