On the efficacy of a proposed unsteady state heat loading protocol
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Date
2020
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NetJournals
Abstract
The paper relates to the thermodynamics of heat transfer processes in which the source of heat is a hot
gaseous fluid. The effect of systematically introducing alternating conditions of compression and
decompression inside a heat exchanger is investigated. The said alternating conditions are actuated by
introducing two periodic valves at the heat exchanger inlet and outlet. This unsteady state mode of operation
is shown to result in enhanced heat exchange under certain conditions. This method of heat exchange has
been termed ‘Unsteady State Heat Loading Protocol (USHLP).’ Experiments were carried out to compare
steady state and USHLP based heat transfer in the context of steam providing heat to a water evaporation
process. In the experiments, heat was transferred from steam to an evaporation process through a jacket
type heat exchanger. An increase in efficiency of around 42% was observed from replacing steady state
heat transfer with USHLP under the same operating conditions and geometric configuration. The results of
the experiments are discussed in the concluding sections of the paper. It was noted that consistently less
steam was used per unit amount of water evaporated in experiments where USHLP was used as compared
to steady state heat transfer
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Bepete, S.; Dlodlo, T.S.; Mudono, S.; Marwizi, T. (2020). On the efficacy of a proposed unsteady state heat loading protocol. African Journal of Engineering; v8(1):10-16.