Heat and mass transfer of composite desiccants for energy efficient air dehumidification: Modelling and experiment

Chua, K.J.

doi:10.1016/j.applthermaleng.2015.06.061

Cited by 33 publications

(5 citation statements)

References 18 publications

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“…There are only certain humid air conditions under which it can perform most effectively at dehumidification. In the absence of moisture in the air, silica gel has a limited capacity for dehumidifying, while composite dehumidifier has better dehumidification performance than traditional dehumidifier [9][10]. In this paper, a honeycomb dehumidification wheel using metal silicate material as a dehumidifier is experimentally studied.…”

Section: Experimental Systemmentioning

confidence: 99%

Variable operating conditions characteristics of circulating wheel dehumidification air conditioning system

2023

J. Phys.: Conf. Ser.

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For its efficient application of low-grade energy, the circulating wheel dehumidification air conditioning system has received a lot of attention and research in response to the shared challenges of environmental protection, energy conservation, and low carbon. Desiccant wheel dehumidification air conditioning systems can recycle waste heat as a desiccant wheel regeneration heat source and improve air quality, which is expected to achieve low energy consumption and high-efficiency dehumidification. The desiccant wheel dehumidification air conditioning system is divided into a treatment air channel and a regenerative air channel. Treated air is directly sent to the air conditioning room after dehumidification and cooling, and regenerative air is directly discharged to the outdoors after the completion of regeneration. Therefore, a new type of recirculated desiccant wheel dehumidification air conditioning system is established. In this paper, the experimental study of the circulating regeneration wheel dehumidification air conditioning system is carried out. Dehumidification characteristics under variable working conditions are quantified and studied. Compared with the water cooling unit, the dehumidification rate of the new circulating wheel air conditioning system is improved effectively. The effects of different treated air temperatures (28 °C–40 °C) and treated air relative humidity (50%–85%) are obtained. The experiment shows that the proposed air conditioning system can effectively improve the dehumidification rate compared with the conventional direct condensation of seawater. Under the same circulating shunt coefficient, the system dehumidification rate increases gradually with the increase of the temperature and humidity of the treated air and the temperature of the reclaimed air. The dehumidification rate has an optimal value, and the corresponding optimal circulation shunt coefficient is 50%–75%, which decreases with the increase of the temperature and humidity of treated air and increases with the increase of the temperature of regenerated air.

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Section: Experimental Systemmentioning

confidence: 99%

Variable operating conditions characteristics of circulating wheel dehumidification air conditioning system

2023

J. Phys.: Conf. Ser.

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“…It was also observed that by adding both PVOH and LiCl to silica gel, its performance was improved by 55% consistently as its moisture removal capacity was improved significantly. 26 It was also stated that the mixture of 25% LiCl, 39% hydroxyethyl urea and 36% water demonstrated a corrosion rate of 0.00267 mm/year, while 35% LiCl showed 0.08 mm/year, and the mixture also showed a better regeneration rate 25 and that the performance of a membrane-based dehumidification system was improved while the mixture of LiCl and CaCl 2 was used in place of pure LiCl. 27 For the same concentration when CaCl 2 content was increased, the COP of the system was increased by 30.23%.…”

Section: Introductionmentioning

confidence: 99%

Dehumidification performance improvement by using liquid desiccant blends – An experimental study

Parida

Kumar

2023

Indoor and Built Environment

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To minimize global warming and consumption of electricity, a desiccant-based air conditioning system has been proposed as a better alternative to control air humidity, compared to the conventional air conditioning system. In the present study, the performance of the hybrid desiccant was compared with the pure LiBr and KCOOH solution. Blends of LiBr and KCOOH at different weight ratios were used as desiccants. The performance of the system was compared based on its moisture removal rate and dehumidification effectiveness. The performance of the system increased with increasing desiccant flow rate, the concentration of the solute and the airflow rate. From the tested concentrations, the blend of 40% LiBr and 10% KCOOH concentration showed the highest MRR and dehumidification effectiveness among all blends of LiBr and KCOOH. From the study, it can be concluded that by using an optimized blend of LiBr and KCOOH as a desiccant in place of neat LiBr, the limitations of pure LiBr can be partly resolved without sacrificing much on the dehumidification performance.

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“…When tested under the same experimental conditions as silica gel, the composite desiccant had an excellent dehumidification capability. Chua [12] investigated the effectiveness of three different types of composite desiccants: silica gel-calcium chloride (CaCl), silica gel-lithium chloride (LiCl), and silica gel-polyvinyl alcohol (PVOH). Composite materials contain a higher percentage of silica gel and halides or polymers, which have strong moisture removal properties when compared to traditional desiccant materials.…”

Section: Introductionmentioning

confidence: 99%

Development and Characterization of Composite Desiccant Impregnated with LiCl for Thermoelectric Dehumidifier (TED)

2022

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Aqueous salt solutions (LiCl) were impregnated into a porous host matrix to create composite desiccant materials (silica gel). The authors of this paper fabricated and analyzed composite desiccant-coated aluminum sheets (DCAS) with varying LiCl mass concentrations. Nitrogen sorption results revealed that the Brunauer–Emmett–Teller (BET) surface area and pore volume of the composite desiccant-coated aluminum sheets decreased. Furthermore, composite DCAS had lower nitrogen sorption than silica-gel-coated aluminum sheets (SGCAS). According to the results, the composite DCAS had the highest thermal conductivity, measuring 6.1 Wm−1 K−1, doubling that of the SGCAS. For evaluating sorption kinetics, the linear driving force model (LDF) was used, and composite DCAS showed greater dynamic sorption quantities and sorption rate coefficients than SGCAS. Furthermore, three different moisture sorption isotherm models were used to fit the experimental results: the Brunauer–Emmett–Teller (BET) model, the Guggenheim–Anderson–Boer (GAB) model, and the double log polynomial (DLP) model. The DLP model was shown to be the best model for predicting the moisture sorption isotherms of DCAS. Additionally, the composite desiccant-coated heat sink (DCHS) of the thermoelectric dehumidifier (TED) was evaluated and compared to silica gel in terms of dehumidification capacity. According to the findings, the outlet air humidity ratio of the composite DCHS reached a minimum of 10.23 g kg−1, and the dehumidification capacity was 0.117 kg h−1 when the input electrical voltage was kept at 9 V.

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Heat and mass transfer of composite desiccants for energy efficient air dehumidification: Modelling and experiment

Cited by 33 publications

References 18 publications

Variable operating conditions characteristics of circulating wheel dehumidification air conditioning system

Variable operating conditions characteristics of circulating wheel dehumidification air conditioning system

Dehumidification performance improvement by using liquid desiccant blends – An experimental study

Development and Characterization of Composite Desiccant Impregnated with LiCl for Thermoelectric Dehumidifier (TED)

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