Go Back   Home > Forums > Amplifiers > Power Supplies

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 1st February 2008, 09:32 AM   #11
diyAudio Member
 
art West-VL.'s Avatar
 
Join Date: Jun 2005
Location: West Vlaanderen
Quote:
Originally posted by Eva
What is the difference?
A cloud is vapor, fog is vapor.
Steam is when the water expands by the heat, in a closed container that would give pressure. vapor does not change the pressure in a container.

Steam is also possible at lower temperatures but then you would have to lower the pressure. High in the mountains you can boil water at about 80C, from then on it would be steam only because the pressure is lower.
If you can get near vacuum, you can see the water boil at, lets say, 18C.
It even go's further. (and a bit off topic)
Because the water boils at 18C, it has to extract the energy from somewhere to keep boiling, the heat of the container or the water itself.
So after a while you get ice, water and vapor all in the same place.
__________________
Break in your loudspeakers at 35% RMS power Right-click'save as...'
Brown noise mono 192kbps(hit "repeat")
  Reply With Quote
Old 2nd February 2008, 11:37 AM   #12
diyAudio Member
 
thermal runaway's Avatar
 
Join Date: Mar 2007
Location: West Mids , UK
Quote:
Originally posted by len_scanlan



Cheers Geoff,

I knew I'd forgotten something - of course steam burns you much more than hot water, its the additional energy to vaporise the water.

Going back to the original post, I don't know if induction heating would be suitable for directly heating water? As far as I know it requires some conductivity in the material being heated. Fresh water would have too high a resistance to get any appreciable heating effect? Salt water maybe... Ovens with induction heating heat the metal pot, not the contents

Len.
My interpretation is that he wants to heat the water thru transfer from an induction heater. So the induction unit gets hot and the water is circulated around it to transfer the heat.

If pressurised steam is required it will need a huge amount of energy to create as not only the water would need to be heated but the mass of the induction unit too !!
  Reply With Quote
Old 2nd February 2008, 11:51 AM   #13
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally posted by AndrewT
2quarts (4pints) to steam in 30seconds!
What heat flow rate is that? kW or MW?
are we up to the megawatts guesstimate yet?
__________________
regards Andrew T.
  Reply With Quote
Old 2nd February 2008, 11:53 AM   #14
diyAudio Member
 
thermal runaway's Avatar
 
Join Date: Mar 2007
Location: West Mids , UK
Cant be far off !!
  Reply With Quote
Old 2nd February 2008, 11:55 AM   #15
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
There may be another way.
Preheat the heater assembly to around 200degC or maybe a lot more.
Then, open the water valve and pass the 4pints through the heat exchanger and out comes 5lbs of steam. But it would need to be a massive heat store and possibly copper rather than aluminium.
__________________
regards Andrew T.
  Reply With Quote
Old 2nd February 2008, 12:00 PM   #16
diyAudio Member
 
thermal runaway's Avatar
 
Join Date: Mar 2007
Location: West Mids , UK
Similar technique is used in flash steam model boats !!

Would thermal shock be an issue ?
  Reply With Quote
Old 7th February 2008, 06:35 PM   #17
diyAudio Member
 
Join Date: Feb 2008
Definitely use a single tube. I would use one with vanes on the inside to maximize surface area between the water and the metal.

Get a copy of Davies & Simpson's Induction Heating Handbook through interlibrary-loan.

See also: Induction Heating
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Induction planars APi Planars & Exotics 12 6th August 2007 05:53 PM
PS choke magnetic induction Klimon Tubes / Valves 3 9th April 2007 08:45 AM
easiest wood to steam bend for horn? Ang Multi-Way 8 27th February 2007 02:47 AM
Thermopile, let extract some electricity from heat without steam jacquesl Everything Else 42 11th February 2007 08:21 AM
Papst Induction Motor. Paul Dimaline Analogue Source 3 20th March 2006 09:24 PM


New To Site? Need Help?

All times are GMT. The time now is 03:30 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2