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Thermcouple Reading

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Old   July 24, 2005, 21:01
Default Thermcouple Reading
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Mohan
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Any one have ideas on why when fan speed is increased the thermcouple shows a lower temperature reading. Can in duct can show temperature lower than ambient. I thought no but the folks ad Omega say it's possible due to colling effect!!!. Appreciate any references to this so called cooling effect. Thanks in advance.
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Old   July 24, 2005, 21:44
Default Re: Thermcouple Reading
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Ahmed
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At first sight what you are saying is not but If thermodynamic inversion takes place, then it is possible (check Joule-Thompson effect in your thermodynamics book) then check your geometry and where the thermocouple is located with respect to the velocity field, and plot the enthalpy field.
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