June 24, 2007
June 24, 2007
June 27, 2007
Division Experimentation & Lab-Oriented Studies
12.1148.1 - 12.1148.11
PC-Based Measurement of Heat of Combustion of a Solid Fuel Using Oxygen Bomb Calorimeter
The paper describes an experimental system developed for measurement of the heat of combustion of a sample of solid fuel. The system is set up to use an Oxygen Bomb Calorimeter together with a temperature sensor. A data acquisition system is used to accurately record temperature versus time response before, during and after the combustion of the fuel sample. The data acquisition system includes an analog to digital converter (IOtech Personal DAQ 3005 with USB connection) a standard software package (DASYLab) to obtain the measurement under program control to determine the observed temperature rise of the system following combustion of a carefully weighed sample of solid fuel. The data processing includes several corrections to the measured temperature rise in order to determine the heating value of the fuel. The oxygen bomb calorimeter can be operated as an adiabatic system to eliminate the heat gain/loss during the experiment. However, the experiment is carried out in a non-adiabatic system to allow a greater insight in this experiment and to enhance its pedagogical value. This experimental system has been developed for an undergraduate laboratory in thermodynamics for Mechanical/Chemical Engineering students.
The heat of combustion1 of a fuel is the amount of heat generated by the complete combustion of a unit weight of fuel and it is expressed in Joules/kg (or other similar units such as BTU/Ib or calories/gram). It is experimentally determined by combustion of an accurately weighed sample of fuel in a calorimeter and measurement of the heat released. In this experimental system, an Oxygen Bomb Calorimeter2 has been used. The temperature rise, T, resulting from the heat released by combustion of the fuel sample is determined from the temperature ~ time response of the calorimeter. A suitable procedure is followed to determine T which accounts for non- adiabatic condition of the calorimeter. Several other corrections are also applied for an accurate determination the heat of combustion of the fuel sample. This paper describes the software and hardware systems used for PC-based data acquisition/processing systems to collect temperature ~ time data and determine the heat of combustion of the fuel sample.
The gross heat of combustion, Hg, of the fuel sample is determined from the energy balance relation that the heat released by the fuel sample within the Oxygen Bomb is equal to the heat absorbed in the calorimeter. Combustion of the fuel sample results in a temperature rise of the bucket containing a measured amount of water in which the Oxygen Bomb is completely submerged. The energy balance relation is expressed by the following equation2,3:
mf Hg = W ( T) – e1 – e2 – e3 (1)
Prasad, R., & Munro, R. (2007, June), Pc Based Measurement Of The Heat Of Combustion Of A Solid Fuel Using Oxygen Bomb Calorimeter Paper presented at 2007 Annual Conference & Exposition, Honolulu, Hawaii. https://peer.asee.org/2980
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