Please use this identifier to cite or link to this item: https://doi.org/10.1081/DRT-120023187
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dc.titleConvective drying with time-varying heat input: Simulation results
dc.contributor.authorIslam, Md.R.
dc.contributor.authorHo, J.C.
dc.contributor.authorMujumdar, A.S.
dc.date.accessioned2014-06-17T06:15:45Z
dc.date.available2014-06-17T06:15:45Z
dc.date.issued2003-08
dc.identifier.citationIslam, Md.R., Ho, J.C., Mujumdar, A.S. (2003-08). Convective drying with time-varying heat input: Simulation results. Drying Technology 21 (7) : 1333-1356. ScholarBank@NUS Repository. https://doi.org/10.1081/DRT-120023187
dc.identifier.issn07373937
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/59800
dc.description.abstractIntermittent drying aims to match the heat input rate to the drying kinetics of the material so as to avoid thermal degradation of heat-sensitive products in particular. This paper presents results of a liquid diffusion model to examine the effect of varying the rates of heat input by convection heat transfer. This is accomplished by varying the drying air velocity, varying the air temperature as well as its relative humidity over different periods of time in a sequential manner. One of the outcomes of this work is guidelines for use of a heat pump to dehumidify the drying air. While most heat pump dryers are designed to operate continuously, our results show that it is not necessary to use heat pump continuously over the entire drying period. This option saves running costs by reducing use of electrical power in the drying cycle. Furthermore, it is possible to save capital costs by utilizing a smaller heat pump for a given dry product output. Alternatively, a given heat pump system can be used to service two or more drying chambers that may dry the same or different products by simply switching the dehumidified and heated air from one chamber to the other sequentially. When the heat pump air is switched off, unsaturated ambient air maybe used to accomplish rest of the drying. It is shown that using heat pump air over only a part of the drying cycle does not increase the drying time appreciably.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1081/DRT-120023187
dc.sourceScopus
dc.subjectEnergy savings
dc.subjectHeat pump drying
dc.subjectHeat sensitive materials
dc.subjectLiquid diffusion
dc.subjectMulti-chamber dryers
dc.subjectVariable humidity
dc.subjectVariable temperature
dc.subjectVariable velocity
dc.typeArticle
dc.contributor.departmentMECHANICAL ENGINEERING
dc.description.doi10.1081/DRT-120023187
dc.description.sourcetitleDrying Technology
dc.description.volume21
dc.description.issue7
dc.description.page1333-1356
dc.description.codenDRTED
dc.identifier.isiut000184969000012
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