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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

SIMULATION STUDY OF DESICCANT COATED HEAT EXCHANGER BASED ON THE DYNAMIC ADSORPTION PERFORMANCE OF ISOTHERMAL DESICCANT COATING

Get access (open in a dialog) DOI: 10.1615/IHTC16.mtr.022701
pages 5757-5764

Sinopsis

The desiccant coated fin-tube heat exchanger (DCHE), featuring the internal cooling and the approximate isothermal dehumidification process, is now a hotspot in heating, ventilation and air conditioning (HVAC) domain. Among those sub-issues proposed by our peers, there is no profound experimental data regarding the water transport mechanism of the isothermal silica gel coating and the component heat and mass transfer performance. Also, corresponding mathematical description is lacked in the field. This article attempts to clarify the dynamic water adsorption process of the isothermal desiccant layer by theoretical, numerical and experimental study. In the meanwhile, a mathematical model is built based on it of the DCHE adopting R410a as refrigerant. Validation and discussion over the model then followed. Results show that the existence of desiccant does not have great influence on heat transfer characteristics of heat exchangers, while the mass transfer feature is greatly enhanced by the desiccant. Compared with traditional vapor compression system, dehumidification heat pump cycle possesses remarkable merits regarding to its coefficient of performance and desiccation capability. In addition, performance of the latter is more sensitive to outdoor humidity change.