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Heating elements — Parallax Forums

Heating elements

ArchiverArchiver Posts: 46,084
edited 2000-10-31 00:09 in General Discussion
How small? A 1 watt or 3 watt wirewound power resistor is pretty small, and
should tolerate 100 deg C.

Ray McArthur
Original Message
From: Jason 1 <plugger2@s...>
To: <basicstamps@egroups.com>
Sent: Monday, October 30, 2000 2:16 AM
Subject: [noparse][[/noparse]basicstamps] Heating elements


> I'm after a component or part that is designed to turn electricity
> into heat, like a toaster element. I'm really after something that is
> durable and small, like a solid-state component. It needs to heat up
> to sub boiling (100C) temperatures. Anyone have any ideas?

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2000-10-30 06:25
    At 10/30/2000 +1000 05:16 PM, you wrote:
    >I'm after a component or part that is designed to turn electricity
    >into heat, like a toaster element. I'm really after something that is
    >durable and small, like a solid-state component. It needs to heat up
    >to sub boiling (100C) temperatures. Anyone have any ideas?

    Peltier junctions can produce heat or cold. Here's one that will provide a
    68 C difference, so (100 C - 68 C = 32 C) if you can provide 32 C it can do
    the rest.
    They EAT batteries for lunch, however.

    [noparse][[/noparse]
    http://www.allelectronics.com/cgi-local/SoftCart.exe/online-store/scstore/p-PJT-\
    2.html?E+scstore
    ]

    Hope that helps

    Regards,

    Bruce Bates


    >Jason
    >
    >__________________________________________________________________
    >Get your free Australian email account at http://www.start.com.au
  • ArchiverArchiver Posts: 46,084
    edited 2000-10-30 06:41
    Perhaps if you helped us with application, we could give better
    ideas. . .

    Doug


    > To: "basicstamps@egroups.com" <basicstamps@egroups.com>
    > From: Jason 1 <plugger2@s...>
    > Date: Mon, 30 Oct 2000 17:16 +1000
    > Reply-to: basicstamps@egroups.com
    > Subject: [noparse][[/noparse]basicstamps] Heating elements

    > I'm after a component or part that is designed to turn electricity
    > into heat, like a toaster element. I'm really after something that is
    > durable and small, like a solid-state component. It needs to heat up
    > to sub boiling (100C) temperatures. Anyone have any ideas?
    >
    >
    > Jason
    >
    > __________________________________________________________________
    > Get your free Australian email account at http://www.start.com.au
    >
    >
    >
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2000-10-30 07:16
    I'm after a component or part that is designed to turn electricity
    into heat, like a toaster element. I'm really after something that is
    durable and small, like a solid-state component. It needs to heat up
    to sub boiling (100C) temperatures. Anyone have any ideas?


    Jason

    __________________________________________________________________
    Get your free Australian email account at http://www.start.com.au
  • ArchiverArchiver Posts: 46,084
    edited 2000-10-30 11:35
    How about a fish tank heater. Not sure if it can go to 100C though.

    --- Jason 1 <plugger2@s...> wrote:
    > I'm after a component or part that is designed to turn electricity
    > into heat, like a toaster element. I'm really after something that is
    > durable and small, like a solid-state component. It needs to heat up
    > to sub boiling (100C) temperatures. Anyone have any ideas?
    >
    >
    > Jason
    >
    > __________________________________________________________________
    > Get your free Australian email account at http://www.start.com.au
    >
    >
    >
    >


    __________________________________________________
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    Yahoo! Messenger - Talk while you surf! It's FREE.
    http://im.yahoo.com/
  • ArchiverArchiver Posts: 46,084
    edited 2000-10-30 13:22
    The other thing to watch for with Peltier, is that they generate so much
    heat they burn up unless you have excellent thermal management to carry the
    heat away from them.

    The classic ways to generate heat are with a resistor (hey that's solid
    state) or a Nicrome wire (ditto). If you can switch power on and off with
    some current (and maybe AC?) how about a coffee immersion heater (little
    coil that goes in a coffee cup) or a soldering iron element.

    Regards,

    Al Williams
    AWC
    *Floating point math for the Stamp, PIC, SX, or any microcontroller:
    http://www.al-williams.com/awce/pak1.htm


    >
    Original Message
    > From: Bruce Bates [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=cevMc2d4MTg9nU4SDThYS62nAS3hGujGLft5R6Fo2FcBPiFC9OxN_Kby9Xdo9m42TfZbooDfoZ0uipHTe-x8qQ]bvbates@u...[/url
    > Sent: Monday, October 30, 2000 12:26 AM
    > To: basicstamps@egroups.com
    > Subject: Re: [noparse][[/noparse]basicstamps] Heating elements
    >
    >
    > At 10/30/2000 +1000 05:16 PM, you wrote:
    > >I'm after a component or part that is designed to turn electricity
    > >into heat, like a toaster element. I'm really after something that is
    > >durable and small, like a solid-state component. It needs to heat up
    > >to sub boiling (100C) temperatures. Anyone have any ideas?
    >
    > Peltier junctions can produce heat or cold. Here's one that will
    > provide a
    > 68 C difference, so (100 C - 68 C = 32 C) if you can provide 32 C
    > it can do
    > the rest.
    > They EAT batteries for lunch, however.
    >
    > [noparse][[/noparse]
    > http://www.allelectronics.com/cgi-local/SoftCart.exe/online-store/
    scstore/p-PJT-2.html?E+scstore
    ]

    Hope that helps

    Regards,

    Bruce Bates


    >Jason
    >
    >__________________________________________________________________
    >Get your free Australian email account at http://www.start.com.au
  • ArchiverArchiver Posts: 46,084
    edited 2000-10-30 14:31
    Hi Jason,

    You didn't mention how big the thing you need to heat is.
    If it's small, you could use a battery powered soldering iron and add
    a temperature sensor to the element of your device. Then you can
    modify the unit to allow you to use a PWM signal to control how hot
    the unit gets. You should be able to get pretty good temperature
    regulation with a simple fuzzy control logic.

    The idea of a battery powered unit is along the lines of what Al had
    mentioned about batteries getting eaten up. The battery irons are
    rechargable.

    Dave


    --- In basicstamps@egroups.com, Jason 1 <plugger2@s...> wrote:
    > I'm after a component or part that is designed to turn electricity
    > into heat, like a toaster element. I'm really after something that
    is
    > durable and small, like a solid-state component. It needs to heat up
    > to sub boiling (100C) temperatures. Anyone have any ideas?
    >
    >
    > Jason
    >
    > __________________________________________________________________
    > Get your free Australian email account at http://www.start.com.au
  • ArchiverArchiver Posts: 46,084
    edited 2000-10-30 15:57
    > I'm after a component or part that is designed to turn electricity
    > into heat, like a toaster element. I'm really after something that is
    > durable and small, like a solid-state component. It needs to heat up
    > to sub boiling (100C) temperatures. Anyone have any ideas?
    Hi Jason,

    If you are looking for a commercial solution, take a look at
    http://www.minco.com/heaters.htm


    -- Tracy
  • ArchiverArchiver Posts: 46,084
    edited 2000-10-30 23:31
    Jason,

    Plain old power transistors make dandy heaters. They're cheap, readily
    available, and usually easy to mount. To turn a transistor into a heating
    element, just add a current limiter...

    One way is to add a small resistor in the emitter circuit of an NPN power
    transistor. When more than 0.6V develops across this resistor, it turns on
    a small NPN that shunts base drive current away from the big guy. I'm no
    good at ASCII schematic drawing, but I could send you a simple PDF if
    necessary.

    >I'm after a component or part that is designed to turn electricity
    >into heat, like a toaster element. I'm really after something that is
    >durable and small, like a solid-state component. It needs to heat up
    >to sub boiling (100C) temperatures. Anyone have any ideas?

    Mike Hardwick, for Decade Engineering -- <http://www.decadenet.com>
    Manufacturer of the famous BOB-II Serial Video Text Display Module!
  • ArchiverArchiver Posts: 46,084
    edited 2000-10-31 00:09
    Original message from: Mike Hardwick <decade@w...>
    >
    >Jason,
    >
    >Plain old power transistors make dandy heaters. They're cheap,
    readily
    >available, and usually easy to mount. To turn a transistor into a
    heating
    >element, just add a current limiter...
    >
    >One way is to add a small resistor in the emitter circuit of an NPN
    power
    >transistor. When more than 0.6V develops across this resistor, it
    turns on
    >a small NPN that shunts base drive current away from the big guy. I'm
    no
    >good at ASCII schematic drawing, but I could send you a simple PDF if
    >necessary.
    >
    >>I'm after a component or part that is designed to turn electricity
    >>into heat, like a toaster element. I'm really after something that
    is
    >>durable and small, like a solid-state component. It needs to heat up
    >>to sub boiling (100C) temperatures. Anyone have any ideas?
    >
    >Mike Hardwick, for Decade Engineering -- <http://www.decadenet.com>
    >Manufacturer of the famous BOB-II Serial Video Text Display Module!

    Thanks Mike, that sounds interesting. I'm a beginner in electronics so
    I would really appreciate it if you could send me the PDF file.

    Jason




    __________________________________________________________________
    Get your free Australian email account at http://www.start.com.au
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