Alumina based insulation bricks are very good at high temp applications. I had a furnace made of such insulation bricks and it was 7cm thick, once the interior was about 1200C the exterior part of the brick never surpasses 100C ...
So 2W is actually true for the energy required for 4000cm^3 of air to be heated from RTP to 1500C ?!
& all the rest of energy is used for the walls... !
Yes I did... & this is what I got which makes no sense from my point of view:
The specific heat capacity of air 1.012 joules per gram per kelvin
The mass of air in 4000cm^3 chamber is nearly 5 gram (1.22 kg/m^3)
Therefore, Total Joules=1.012*5*1500 = 7590 joules
W=J/t hence heating in...
Hello,
I have been struggling to calculate the joules required to heat a sealed chamber (cuboid shape 20x20x10cm=4000cm^3) filled with Air from room temperature to 1500 Celsius and couldn't get any straight answers from my calculations...!
Considering this chamber (which is actually an...
highly appreciate your comments,
Considering this wire is used as the primary wire of a transformer, how many amps do you think it can carry for continuous duty? Because I didn't quite understand what you mean by "fusing current"... & how many kVA would you guess?
Is it the current which...
how much current can a 3 mm wire carry?
Hello
I was wondering how much current can a wire with of 3 mm diameter can carry?
Considering the maximum temperature of the wire doesn't change considerably, to melt the insulation...
Unfortunately I don't know which gauge wire this is...
I see your point windadct... Very precise indeed. I do have an AC transformer but unfortunately I was willing to set up the furnace in a remote location, therefore I was hoping to set it up without a transformer...
But apparently there is no way out, I have to carry the transformer somehow...
Many thanks for your contributions... I highly appreciate it.
I have calculated 5 watts/cm^2 to be the necessary power. The resistance of each element is 0.6 ohm & 6 of them will be used.
"A total of 110V & 30A" will be required to get 1400C
My supply is 220V & I can draw 30 Amps...
Hello,
I have Silicon Carbide heating elements which should be used with a Step Down Transformer or SCR as mentioned in the guide from manufacturer.
I currently have a SSR available at hand, and was hoping it could be used instead.
The Solid State Relay when connected to PID can...
I had only read one article sometime back on internet which had a supply of 50V 150Amps DC... but couldn't find anything else...
There are these AAS (Atomic Absorption Spectroscopy) devices which utilize Graphite Heating tubes, from manufacturers like Buck Scientific... I wonder what the...
Thanks milesyoung, very interesting indeed... how about heating elements like Silicon Carbide or Nicrome wires, they too last longer on AC?
I haven't really figured out why is it that the Graphite heating elements are plugged in DC generally speaking...?! Is there any special reason?
Hello,
Is it possible to run heating and elements and other devices with DC supply?
I have turned on Nickel-Chromium Heating wires with AC but is it okay to use it with DC supply?
What's the main practical difference between AC & DC, as long as the voltage and current of supply is...
Yes. A specialist Heating element must be used. Fortunately such high grade graphites are available and already used in Atomic Absorption Spectroscopy (Graphite AAS) by Buck and other manufacturers.
The unfortunate part is they don't provide any information regarding the heating behavior of...
Thaaaaaaaaaaaaank you very much Floid, this clarifies everything...
What is your take on my assumption that I will need 3000Watt to reach 2000K ?
Is this formula applicable in this context?
Power=(surface area of blackbody)*(boltzman constant)*emissivity*(Temperature)^4
I got this from...