Performance study on composite desiccant material coated fin-tube heat exchangers

Hu, Liguo; Ge, T.S.; Jiang, Yu-Qiang; Wang, Ruzhu

doi:10.1016/j.ijheatmasstransfer.2015.06.033

Cited by 96 publications

(21 citation statements)

References 28 publications

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“…In letzter Zeit werden hierfür vermehrt Wärmeübertrager eingesetzt, die mit Adsorbens beschichtet sind , . Diese können über einen Fluidkreislauf direkt gekühlt und erhitzt werden, um einerseits die Adsorption isotherm zu halten, andererseits aber die Desorption des Materials durchführen zu können, ohne die Luft vorzuheizen.…”

Section: Stand Der Forschungunclassified

“…Diese können über einen Fluidkreislauf direkt gekühlt und erhitzt werden, um einerseits die Adsorption isotherm zu halten, andererseits aber die Desorption des Materials durchführen zu können, ohne die Luft vorzuheizen. Verglichen mit herkömmlichen DEC‐Systemen kann die Entfeuchtungsleistung mit einem solchen wassergekühlten Verfahren um 46 % erhöht werden .…”

Section: Stand Der Forschungunclassified

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Adsorbents for Dehumidification, Cooling, and Water Harvesting

Ernst

Baumgartner

Fröhlich

et al. 2017

Chemie Ingenieur Technik

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Wasseradsorption an porösen Materialien bietet Möglichkeiten, das gesteigerte Komfortbedürfnis der Menschheit zu adressieren: Sorptionsgestützte Klimatisierung, Entfeuchtung und Wassergewinnung aus der Umgebungsluft. In vorliegender Arbeit werden drei neuartige Adsorbentien, die zwei MOFs Aluminium-Fumarat und CAU-10-H, sowie ein PMO mit Blick auf die Anwendung charakterisiert. Die maximale Wasserbeladung der Materialien liegt zwischen 0,35 und 0,52 g g -1 .Für verschiedene Anwendungen wurde der Umsatz berechnet und in einem Eigenaufbau die Stabilität der Materialien über 300 Zyklen untersucht.Water adsorption on porous materials offers opportunities to address the increased comfort needs of mankind: sorptionassisted air-conditioning, dehumidification, and water extraction from ambient air. In the present work, three novel adsorbents, two MOFs aluminum fumarate and CAU-10-H, as well as a PMO with regard to the application are characterized. The maximum water loading of the materials is between 0.35 and 0.52 g g -1 . The water exchange was calculated for various applications and the stability of the materials was investigated in a self-assembled test setup over 300 cycles.Abbildung 7. Darstellung der Adsorptionsenthalpien fü r die betrachteten Materialien. Berechnet aus dem wDSL-Ansatz (durchgezogene bzw. gepunktete Linien) und nach Dubinin-Astakhov (gestrichelte Linien).Abbildung 8. Wä hrend der Zyklierung maximal erreichte Beladung der Adsorbentien aufgetragen ü ber der Zyklenzahl.

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Section: Stand Der Forschungunclassified

Adsorbents for Dehumidification, Cooling, and Water Harvesting

Ernst

Baumgartner

Fröhlich

et al. 2017

Chemie Ingenieur Technik

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“…The last few decades have witnessed significant research development towards the design and application of various desiccant dehumidifiers, which can be broadly classified into three major categories, namely, rotary desiccant wheel, fixed bed, and desiccant-coated heat exchangers (DCHEs). Each technology has their advantages and disadvantages over each other, and extensive details in this regards can be found in several literature studies [1,[4][5][6][7]. Among all the three aforementioned technologies, DCHEs are considered as the most efficient methodology to reduce the overall cooling load with improved dehumidification with the least energy budget expenditure, hence employed for many real-life applications [5].…”

Section: Introductionmentioning

confidence: 99%

“…The composite super desiccant polymer's sorption capacity was tested on desiccant wheels, and it was realized that sorption capacity is 2~3 times better than traditional solid desiccant material silica gel [18]. Recent studies have extensively highlighted that the composite desiccant-coated FTHEs demonstrate superlative capacity towards the dehumidification process [7,10]. For instance, in a recent study, Vivek et al evaluated the PVA (polyvinyl alcohol)-LiCl-coated heat exchanger's performance that illustrates a 20-60% improvement in the dehumidification capacity [10].…”

Section: Introductionmentioning

confidence: 99%

Dehumidification Effect of Polymeric Superabsorbent SAP-LiCl Composite Desiccant-Coated Heat Exchanger with Different Cyclic Switching Time

et al. 2020

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This study investigated a composite polymer desiccant material’s performance, which is prepared by impregnating solid desiccant such as sodium polyacrylate (SAP) on to hygroscopic salts such as lithium chloride (LiCl). Dehumidification performance of the proposed composite polymer desiccant (SAP-LiCl) was analyzed by coating the suitable weight percentage (wt %) of the desiccant onto a single fin-tube heat exchanger (FTHE) system and testing the desiccant-coated heat exchanger (DCHE) in a testing tunnel under various operating conditions. Net dehumidification efficacy of DCHE in terms of sorption and desorption amount and thermal performance (COPth) were analyzed. For instance, with processed air inflow temperature, relative humidity and regeneration temperature setting of 30 °C, 80% RH and 70 °C, DCHE’s sorption, desorption amount and COPth were recorded as high as 945.1 g, 1115.1 g, and 0.39, respectively. It was further realized that the performance of the DCHE could be enhanced by modulating the cyclic switching time for dehumidification and regeneration processes. For instance, with the aforementioned processed airflow conditions, when the cyclic switching time tuned as 60 min instead of 10 min for a total time period of 120 min, there is a net 58% improvement to the COPth of the system. It was further observed that, under the same time period corresponding to the increase in cyclic switching time, the overall COPth can be enhanced; however, the water vapor sorption and desorption amounts of desiccant were decreased.

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“…Moreover, the outlet air temperature is usually lower than that of supplying air. So it is necessary to reheat the air [1]. The energy consumption of reheating air is serious in this process [2].…”

Section: Introductionmentioning

confidence: 99%

Study on Dehumidification Performance of a Multi-Stage Internal Cooling Solid Desiccant Adsorption Packed Bed

et al. 2018

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In this paper, the solid desiccant adsorption packed bed with a three-stage internal cooling (ICSPB) has been proposed to improve the dehumidification efficiency and make a comparison with that of non-internal cooling. To investigate the performance of the ICSPB, the dehumidification capacity, dehumidification efficiency, water content of solid desiccant, moisture ratio of solid desiccant, temperature of solid desiccant and inlet and outlet air temperature difference were discussed in different conditions of inlet air and supplying water temperature. It was found that the dehumidification performance of the bed with internal cooling could be improved greatly in the low temperature and low humidity conditions, while in the high temperature and humid, the improvement was not obvious. With internal cooling, the dehumidification efficiency and the water content of the solid desiccant could be improved 59.69% and 110.7%, respectively, and the temperature of solid desiccant could be reduced 2.2 °C when the ICSPB operated at the inlet air temperature of 20 °C, inlet humidity of 55%, and water temperature of 14 °C. Moreover, the dehumidification performance at each stage of ICSPB was studied. It was found that, the first stage played the most important role in the dehumidification process. In addition, the calculation models that can be used to predict the moisture ratio and the temperature of solid desiccant were established on the test results.

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Performance study on composite desiccant material coated fin-tube heat exchangers

Cited by 96 publications

References 28 publications

Adsorbents for Dehumidification, Cooling, and Water Harvesting

Adsorbents for Dehumidification, Cooling, and Water Harvesting

Dehumidification Effect of Polymeric Superabsorbent SAP-LiCl Composite Desiccant-Coated Heat Exchanger with Different Cyclic Switching Time

Study on Dehumidification Performance of a Multi-Stage Internal Cooling Solid Desiccant Adsorption Packed Bed

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