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Constructing models for a pebble heater and drying wood : internship report

Bijl, Sander (2012) Constructing models for a pebble heater and drying wood : internship report.

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Abstract:The report describes the two phases of my internship at Clean Fuels bv in Oldenzaal, the Netherlands. Goal was to model the behaviour of a pebble heater, a heat exchanger capable of exchanging and storing heat. Based on literature a numerical model was constructed. Combining the literature model with the one term approximation it is now possible to determine not only the gas temperature and surface temperature of the pebbles but also the centre temperature of the pebbles. The second part of the report handles the modelling of the drying of wood by forced convection. Wood is complex to model due to its’ anisotropy and the presence of various different forms of water. Models have been made to simulate the first phase of a drying process, “the constant drying rate” phase. In this first phase only “free” water is removed from between the cells. Assuming wood is stored in the reactor having the same shape as the pebbles of the pebble heater, the governing equation of the pebble heater can be used as a basis to model the drying of wood by forced convection.
Item Type:Internship Report (Master)
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
Link to this item:http://purl.utwente.nl/essays/62556
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