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A EROSPACE E NGINEERING L ABORATORY (MAE308)

A EROSPACE E NGINEERING L ABORATORY (MAE308). P ROF . S EUNG W OOK B AEK D IV . OF A EROSPACE E NGINEERING , KAIST, IN KOREA R OOM : Building N7-2 #3304 T ELEPHONE : 3714 swbaek@kaist.ac.kr http://procom.kaist.ac.kr T A : Donggi Lee R OOM : Building N7-2 #3315

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A EROSPACE E NGINEERING L ABORATORY (MAE308)

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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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