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Transient Thermal Behavior with Work and Heat Loss

Transient Thermal Behavior with Work and Heat Loss. Laboratory 3. Objectives. Study thermal response of a system due to mechanical work input Model the thermal response as a first order system. Figure 1. Schematic of the Calorimeter Arrangement. Background.

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Transient Thermal Behavior with Work and Heat Loss

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  1. Transient Thermal Behavior with Work and Heat Loss Laboratory 3

  2. Objectives Study thermal response of a system due to mechanical work input Model the thermal response as a first order system

  3. Figure 1. Schematic of the Calorimeter Arrangement Background Frictional mechanical work (Power) input Heat gain and loss System: Calorimeter Temp rise

  4. Background • Heat loss • (Recall thermocouple physics) • Controlling Equation:

  5. Simplifications No heat loss No work input

  6. Thermistor +5 Volt Supply To A/D Converter 100 kΩ Thermistor • Ceramic Resistance Temperature Device • R decreases as T increases • T (Celsius) = 17.58 V(t)– 18.73 (volts) ~100 kΩ

  7. Typical Heating Data

  8. Cooling Data

  9. T() = 75 2/3 x 70 = Step  47 • τ  7 – 2 = 5 sec T(0) = 5 t(0) = 2 sec Thermocouple Dynamic Calibration

  10. Time Constant

  11. Linearized Temperature vs. Time

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