ME 4611: Experiment 5 Bomb Calorimeter Experiment

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Presentation transcript:

ME 4611: Experiment 5 Bomb Calorimeter Experiment Yvette Triay - Leader Group 4

Purpose of the Experiment To understand what a bomb calorimeter is, how to use it, and why it is useful To determine the thermal capacitance of the calorimeter To determine the gross heat of combustion of the samples provided

What is a bomb-calorimeter? Used to measure heat created by a sample burned under an oxygen atmosphere in a closed vessel, which is surrounded by water Temperature differences in water are measured Thermal capacitance and heat of combustions can be calculated with this data

Equipment: Parr Oxygen Bomb Calorimeter Picture taken from Parr Operating Manual: 1341 Oxygen Bomb Calorimeter [4]

Picture taken from Parr Operating Manual: 1341 Oxygen Bomb Calorimeter [4]

Thermodynamic Background 1st Law of Thermodynamics Q=mcvΔT Q – heat of combustion mcv – thermal capacitance of the system ΔT – temperature rise

1) Known Fuel (Benzoic Acid) 2 Tests Conducted 1) Known Fuel (Benzoic Acid) 2) Unknown Fuel Calorimeter is considered the thermodynamic system Find thermal capacitance (mcv)calorimeter=Q/ΔT Calorimeter capacitance remains constant Find heat of combustion Q=(mcv)calorimeterΔT ★ Q is the heat of combustion of the fuel and the ignition wire.

Estimate the thermal capacitance of the system (2kg water and 3 kg stainless steel). (Thermal Capacitance)system = m(H2O)cv(H2O) + m(SS)cv(SS) (mcv)System = (2 kg)(4180* J/kg-K) + (3 kg)(470* J/kg-K) (mcv)System = 9770 J/K * See [1] of Appendices

Using Q = 26414* J/g [1], and plugging into the equation Predict the temperature rise for 1 gram of Benzoic acid, which will be used as the calibration sample. Using Q = 26414* J/g [1], and plugging into the equation ΔT = Q/mcv ΔT = (26414 J/g)*(1 g) / (9770 J/K) ΔT = 2.7 K * See [2] of Appendices

Appendices [1] Cengal, Yunus Appendices [1] Cengal, Yunus. Heat and Mass Transfer: Fundamentals & Application, 4th Ed. [2] http://www2.stetson.edu/~wgrubbs/datadriven/fchen/strain/strainchen.html [3] ME 4611 Laboratory Manual: Experiment 5 – Bomb Calorimeter Experiment [4] Parr Operating Manual: 1341 Oxygen Bomb Calorimeter [5] 1st Law of Thermodynamics: (total energy entering a system ) – (total energy leaving a system) = (change in total energy of the system)