Quartz short wave infra red heating elements
Quartz short wave infra red heating elements
(OP)
I am considering a non conventional use of short wave infra red heating heating mass of steel (15-35 kg) by direct contact or near proximity. Target temperature near 1000C has proved problematic for cartridge heaters. Induction heating not feasible and I need to keep power source AC electrical.
Any body know infra red heater specialist who would be able to advise me on use of their product in this application?
Most I have found so far have not been willing of able to discuss heating in this non conventional way despite it looking feasible.
Any help welcome.
Any body know infra red heater specialist who would be able to advise me on use of their product in this application?
Most I have found so far have not been willing of able to discuss heating in this non conventional way despite it looking feasible.
Any help welcome.





RE: Quartz short wave infra red heating elements
Perhaps you need to explore that some more. Standard diffusion furnaces run up to 1200ºC using electrical heaters. From your drawing, it appears that you've not devoted much volume for the heating elements. Have you determine what your heat loss is?
If you are having trouble with cartridge heaters, how are infrared heaters going to help? They're essentially long cartridge heaters, are they not?
Why is induction being precluded?
TTFN
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RE: Quartz short wave infra red heating elements
http://www.noblelight.net/
http://www.quartztubing.com/
RE: Quartz short wave infra red heating elements
To get effective radient heating source should be several hundreds of deg. C above heated body . Short wave i.r. heaters like quartz tubes seem ideal since they burn at over 1900C and quartz can take temperatures much higher. Problems are they are fragile and ends need to be kept below 300C for electrical connections.
There may be many other issues I have overlooked.
RE: Quartz short wave infra red heating elements
RE: Quartz short wave infra red heating elements
RE: Quartz short wave infra red heating elements
Actually, given that it's a closed volume, reflectivity should be irrelevant; that's the cavity blackbody effect. Given a high temperature source in the center of the well, the walls must rise in temperature, per laws of thermodynamics.
I assume you expect to be able to access the parts after heating, so part of the electrical heating question is tied to using wells for the heating. As I stated earlier, there are commercial furnaces that exceed 1200°C using electrical heating, but from the outside in:
http://www.thermcraftinc.com/diffusion/fibercraft.... You'd place your samples inside the coils. I would assume that you could get a custom design that was more rectangular in shape.
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RE: Quartz short wave infra red heating elements
http://www.thermcraftinc.com/box-furnaces.html
http://www.thermcraftinc.com/umages/pdf/GeneralPur...
Seems to me that you're essentially building your own furnace. Note the smallest furnace at 12"x15"x30" consumes 18 kW. If your losses are comparable to that, the heater design is non-trivial.
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RE: Quartz short wave infra red heating elements
What would be the effect on the life of heater tube to have its temperature maintained above 1000C even when not heating? Would this adversely effect the halogen cycle? Or would it extend heater life by preventing tungsten depositing on quartz tube inner surface?
RE: Quartz short wave infra red heating elements
RE: Quartz short wave infra red heating elements
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