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Measurement of Heat Release Using Bomb Calorimeter in Aerospace Engineering

This laboratory experiment focuses on the measurement of heat release using a bomb calorimeter, an essential tool for testing the calorific value of reactants in aerospace applications. It explores the fundamentals of heat transfer and thermodynamic equilibrium, leveraging the First Law of Thermodynamics. This experiment is crucial for predicting energy changes in combustion processes, propellant, and explosive testing. Students will gain practical skills in calorimetry, understanding both exothermic and endothermic reactions within closed and open systems.

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Measurement of Heat Release Using Bomb Calorimeter in Aerospace Engineering

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  1. AEROSPACE ENGINEERING LABORATORY (MAE308) • PROF. SEUNG WOOK BAEK • DIV.OFAEROSPACE ENGINEERING, KAIST, IN KOREA • ROOM: Building N7-2 #3304 • TELEPHONE : 3714 • swbaek@kaist.ac.kr • http://procom.kaist.ac.kr • TA: Donggi Lee • ROOM: Building N7-2 #3315 • TELEPHONE : 3754 • kingdonggi@kaist.ac.kr

  2. Measurement of Heat Release using Bomb Calorimeter • Contents • A. Objective • B. Necessity • C. Background

  3. Objective • Purpose of Experiment • Measurement of the calorific value of reactants Measurement !!

  4. Necessity • Bomb Calorimeter • In combustion process

  5. Necessity • Heat Transfer • The process of reaching thermodynamic equilibrium

  6. Necessity • Predicting Unknown Substances • By experiments (Calorimeter)- Fuel testing- Propellant and explosive testing Products Unknown Known Prediction

  7. Background • The First Law of Thermodynamics • “ Energy can be neither created nor destroyedduring a process • ; it can only change forms” • Energy is conserved in any chemical reaction. = heat added to system(positive) = internal energy = work done by system where

  8. Background • Closed System • ( internal combustion engine, etc.) • For constant volume process ()» Internal energy change

  9. Background • Open System • ( pump, turbine, compressor etc.) • For constant pressure process ()» Enthalpy change

  10. Background • Calorimetry • The measurement of heat is generated (exothermic process) or consumed (endothermic process) during a chemical reaction or event involving heat transfer.

  11. Background • Calorimeter • In many cases, the study of heat exchange is measured with an apparatus called a calorimeter.

  12. Background • Coffee-Cup Calorimeter • Constant pressure (isobaric) condition • Bomb Calorimeter • Constant volume (isochoric) condition

  13. Background • Reactions at Constant Volume • Some reactions, such as combustion, cannot be carried out in a coffee-cup calorimeter. • In an bomb calorimeter, a sample of known mass is placed in a heavy walled “bomb”, which is then pressurized with oxygen. • At constant volume,

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