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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

HEAT AND MASS TRANSFER OF DESICCANT COATED HEAT EXCHANGER WITH MICROCHANNEL AND FIN-AND-TUBE TYPES

Get access (open in a dialog) DOI: 10.1615/IHTC16.her.022600
pages 4519-4526

Sinopsis

Desiccant coated heat exchanger which is fabricated by coating desiccant on the conventional heat exchanger to achieve dehumidification, has been extensively drawn attention due to its benefits of handling sensible heat and latent heat separately. In order to make out which type of heat exchanger fabricated as desiccant coated heat exchanger can show larger heat and mass transfer capacity, a desiccant coated fin-and-tube heat exchanger composed of copper tubes and aluminum fins and a desiccant coated microchannel heat exchanger manufactured totally by aluminum are tested. An experimental setup is built to test the heat transfer, mass transfer and pressure drop characteristics of different kinds of desiccant coated heat exchanger. By recording the dynamic performances, the two are analyzed and compared. Under the same operating conditions, heat transfer coefficient of microchannel type is the double of that of fin-and-tube type, while the moisture removal per unit mass transfer area of microchannel type is 80% larger than that of fin-and-tube type. With different structure sizes of the two, the comparisons of non-dimensional numbers are more persuasive. With the same Reynolds number from 80 to 480, the Nusselt number of microchannel type is from 9 to 20.2, approximately twice as large as that of fin-and-tube type from 4.2 to 10.2, while the Euler number of fin-and-tube type is larger than that of microchannel type. A conclusion can be drawn that microchannel type shows higher heat and mass transfer capacity compared with fin-and-tube type, at the expense of higher pressure drop.