Achieving Uniform Temp of 600F on a Metal Chamber w/ 3 Thermocouples

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SUMMARY

The discussion focuses on achieving a uniform temperature of 600°F on the exterior of a metal chamber containing sand blast beads, utilizing a flanged immersion heater and three thermocouples for temperature monitoring. The results indicate significant temperature discrepancies: 600°F at the top, 856°F in the middle, and 497°F at the bottom. The user proposes adjusting the temperature control to the bottom thermocouple and insulating the upper sections of the heating element to improve temperature distribution. This approach aims to mitigate the uneven heating caused by the immersion heater's shorter length.

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  • Understanding of thermocouple placement and temperature measurement
  • Knowledge of immersion heater operation and thermal dynamics
  • Familiarity with insulation materials and their thermal properties
  • Basic principles of heat transfer in cylindrical vessels
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anolan23
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A flanged immersion heater is used to heat sand blast beads contained in a 400in^3 skinny cylindrical vessel (D=4"NPT, L=0.82m). My goal is to achieve a uniform temperature of 600F on the outside of the metal chamber. We used three thermocouples. One near the top portion on the outside of the chamber, one in the middle, and one on the bottom. Testing with this setup yielded the following results. The top thermocouple was hooked up to a temperature control that was set to 600F.

Top Thermocouple- 600F
Middle Thermocouple- 856F
Bottom Thermocouple- 497F

How can I make these temperatures more evenly distributed to 600F? Any suggestions?

NOTE: The immersion heater elements are a little shorter than the vessel that surrounds it.
 
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I'm thinking I can set the temperature control on the bottom thermocouple and then insulate the top and middle portions of the heating element. I am assuming the temperatures aren't uniform due to the heating element. Ya think?
 

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