ST Alpha - "oh wow. they say thick layer inside is best. See Figure 3." (Reading a Post)

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In response to "the answer may be in here. I'm still reading it. -- (link)" by loosilu

oh wow. they say thick layer inside is best. See Figure 3.

Posted by loosilu (aka loosilu2) Jun 26 '12, 15:07

"The interesting result is that putting the thick layer inside is warmest and the worst option is to wear the (windproof) fleece as the outer layer with a light inner layer. The reason for the surprising result is that the air gap between layers is a better insulator when it is in a relatively cold location in the clothing system. Radiation heat transfer is less efficient at lower temperatures. When the thin layer is on the outside the air gap between the layers is much colder than when the thick layer is on the outside and thus it is a better insulator. This is another reason why layers work, putting a fabric layer against the skin followed by an air gap to an outer fabric lowers the temperature in the air gap and makes the gap a better insulator. The air gap between layers has no weight - making for a very nice ultralight backpacking system."

Responses:

I don't think their "shells" are comparable to the blankets that mafic is asking about. - musubi Jun 26, 15:19 1
- ah, ok. -- nm - loosilu Jun 26, 15:27
that does not fit with mafic's initial parameters. the layers in that experiment have different insulation factors. -- nm - zork Jun 26, 15:16 1
- you're right. funn thing though, I realized I use their method for cross country skiing. Thick layers below, and a thin shell on top. -- nm - loosilu Jun 26, 15:28

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oh wow. they say thick layer inside is best. See Figure 3.

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