 Poster: A snowHead
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the snow at Hemel and other indoor snow centres? They make snow all the time, it is always below freezing but the levels are always going down not up. Does it melt, get compacted, turn into ice or what?
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Obviously A snowHead isn't a real person
Obviously A snowHead isn't a real person
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Sublimation at the top. Melting at the bottom.
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Well, the person's real but it's just a made up name, see?
Well, the person's real but it's just a made up name, see?
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I had a big crash there one time and swallowed a fair bit. Must learn to keep my mouth closed when wiping out.
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80% of the snow which falls on the mountains evaporates so the atmosphere in a snowdome must be quite damp! In the enclosed box of a snow centre that's probably why it can feel so damn cold, even though a few degrees below freezing out on a mountain top, with no wind, would feel almost balmy.
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Anyway, snowHeads is much more fun if you do.
Anyway, snowHeads is much more fun if you do.
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laundryman, i wondered about sublimation as it can be quite foggy in there from time to time, i just put it down to a lot of heavy breathing but sublimation would make sense. i had always assumed some melt off but they have glycol pipes under the snow and there is an ice layer below the snowpack so i doubt much melts but cant say for sure.
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pam w,
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80% of the snow which falls on the mountains evaporates
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interesting where did you learn that?
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I can't remember - but I remember believing it at the time so it must have been a reliable source.  That's why the depth can go down quite fast even when it's v cold and nothing is melting at all - the mountain air is very dry so I suppose it sucks it up pretty effectively, even when there isn't a foehn wind, which can eat up inches in a day.
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I saw a bunch of snow being dumped at the side of of Castleford once... what I've always wondered is, can they make snow and have indoor pow? If you leave the taps on do you get a room full of snow?
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You'll get to see more forums and be part of the best ski club on the net.
You'll get to see more forums and be part of the best ski club on the net.
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I've skied in MK when they've had the snow machines running. Very unpleasant and very cold.
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I think most of it leaves on snowboarders butt's 
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snowHeads are a friendly bunch.
snowHeads are a friendly bunch.
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can they make snow and have indoor pow
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I suspect they can't. After all, only a small proportion of the stuff that falls out of the sky is powder (despite the determination of some people to call everything "pow" even if it's wet as anything and squishes down like a slice of Mother's Pride). The atmosphere is probably not dry enough. wrong droplet size, or whatever.
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And love to help out and answer questions and of course, read each other's snow reports.
And love to help out and answer questions and of course, read each other's snow reports.
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I think most of it leaves in snowboarders butt craics
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Fixed it for you
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The snowdomes seem to vary quite a bit in terms of temperature. I always feel too hot at Tamworth and tend to just ski in jeans, a sweater and thin gloves. But I remember feeling a little cooler at both Hemel and CFe, in fact I remember the temperature sign at CFe said -6º. I daresay the snow must melt with use.
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You know it makes sense.
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The bottom of my old ski pants fill up with snow, Sorry its my fault
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Otherwise you'll just go on seeing the one name:
Otherwise you'll just go on seeing the one name:
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Don't they have melt pits of some kind they dump a load of old snow in (the dirty stuff from the top?)
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Poster: A snowHead
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queen bodecia, jeans? Could you pick more impractical snow wear 
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Obviously A snowHead isn't a real person
Obviously A snowHead isn't a real person
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| scotia wrote: |
| queen bodecia, jeans? Could you pick more impractical snow wear |
bikini?
LMAO @ rob btw
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Well, the person's real but it's just a made up name, see?
Well, the person's real but it's just a made up name, see?
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Nowt wrong with jeans at Tamworth. Like I said, it's too warm for salopettes.
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But jeans? Reminds me of the days when they were actually seen on the piste...
If you don't have shell salopettes then at least wear tracky bums or similar...never jeans!! 
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Anyway, snowHeads is much more fun if you do.
Anyway, snowHeads is much more fun if you do.
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so there you are, queen bodecia, you've been told! You're deluded to think that you were perfectly comfortable in your jeans.
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You'll need to Register first of course.
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at least wear tracky bums
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have I missed something on the new equipment thread
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| beanie1 wrote: |
| Don't they have melt pits of some kind they dump a load of old snow in (the dirty stuff from the top?) |
At Ski Dubai that's exactly what they do - but with the cruddy stuff from the bottom of the slopes. As it melts, the 'coolth' is used to help the A/C system. So altho' the whole affair is still nuts it's at least attempting to minimise the energy consumption.
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Dehumidifiers take away some snow depth. The trashed stuff gets pushed outside into the melt pit.
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You'll get to see more forums and be part of the best ski club on the net.
You'll get to see more forums and be part of the best ski club on the net.
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beanie1, but why? Salopettes are too warm and tracky bums are too baggy (I'm not a boarder!).
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snowHeads are a friendly bunch.
snowHeads are a friendly bunch.
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And love to help out and answer questions and of course, read each other's snow reports.
And love to help out and answer questions and of course, read each other's snow reports.
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I wear a helmet for riding my motorcycle. That is all. 
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You know it makes sense.
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Otherwise you'll just go on seeing the one name:
Otherwise you'll just go on seeing the one name:
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All the snow is soaked up by queen bodecia's jeans. Glad we cleared that one up.
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Poster: A snowHead
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| skimottaret wrote: |
| Does it melt, get compacted, turn into ice or what? |
It melts and some may then evaporate.
A miniscule amount may sublimate but this would be such a tiny amount as to be almost non-existent, due to a lack of the large amount of energy that sublimation requires - note the sun provides (technical term here) shed loads of energy for sublimation, and the lower the pressure (ie, higher up) the less energy is required. Which is why you get more sublimation of snow higher up and why snow gets slushy lower down. It's also colder higher up (for extremely complex reasons) so the snow lower down gets slushier quicker.
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Obviously A snowHead isn't a real person
Obviously A snowHead isn't a real person
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Well, the person's real but it's just a made up name, see?
Well, the person's real but it's just a made up name, see?
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beanie1, what ya tryin' to say like? My jeans don't get damp!
And this is only Tamworth we're talking about after all.
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You need to Login to know who's really who.
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Mr HL says that sublimation is to change from solid to gas without becoming a liquid. Carbon Dioxide does this ice/snow will always go through a liquid phase before becoming water vapour.
er.... questions and cries of disbelief direct to Mr HL please (4 years Hons degree in materials science). Also, BTW, the fogginess is out of balance air con (he worked for the company that did the ice rinks and bobsleigh runs at Lillehammer winter olympics)
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Anyway, snowHeads is much more fun if you do.
Anyway, snowHeads is much more fun if you do.
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You'll need to Register first of course.
You'll need to Register first of course.
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Was in the Hemel fridge today so made a point of considering "where it all goes". I'm going to say evaporation. It's cold in there but also decidedly clammy and that humidity must becoming from evaporating schnee. No?
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Bode Swiller, The humidity could also come from people breathing out.
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Wayne, so as the altitude indoors is virtually sea level, no wind and no sunlight to provide energy sublimation will be negligible which leaves melting or physical removal by the piste bully.
as temp is generally held between -2 and -6 and glycol pipes are between the foundations on the hill, an ice layer then the snow i dont see how there is appreciable snow melt going on... i guess pressure from skis melts the snow as the skis compress the snow and then there may be evaporation which is removed by de humidifiers ? i cant imagine that is significant but what do i know i sucked at physics. , my physics professor was a nun who was so boring she was known as Sister Sominex
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You'll get to see more forums and be part of the best ski club on the net.
You'll get to see more forums and be part of the best ski club on the net.
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skimottaret,
Last (and only) time I was down at Hemel there was an obvious reason for the lowering of the snow levels. Snowboarders were sitting all over the place. This saturation of the available space by brown baggy trousers will cause a quick rising of the dude levels, thus making the snow disappear as if by magic.
| skimottaret wrote: |
| as temp is generally held between -2 and -6 and glycol pipes are between the foundations on the hill, an ice layer then the snow i dont see how there is appreciable snow melt going on... |
You may be right never really though about it much. Best bet would be to ask the firm that designed the snow making equip. Remember though the melt can take place quite rapidly (relatively) even if the ambient temp is below 0. I would hazard a guess that the snow in your big fridge gets much friction than a normal alpine run – friction is not just ski and boards going over it (although this will play its part), it’s also each time the snow is moved (snowplough, side slip, etc), so even if it’s not skied over there will still be some lose of mass. But like I said, never really given it much thought and don’t know anything about how the big fridges work to even give a reasonable calc’.
Last edited by You'll get to see more forums and be part of the best ski club on the net. on Tue 10-08-10 19:32; edited 1 time in total
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skimottaret,
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my physics professor was a nun
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bad habits! springs to mind via a huge jet turn compressing god knows how much snow?
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