Design and performance evaluation of a multilayer fixed-bed binder-free desiccant dehumidifier for hybrid air-conditioning systems: Part I – experimental

Shamim, Jubair A.; Hsu, Wei-Lun; Kitaoka, Kenji; Paul, Soumyadeep; Daiguji, Hirofumi

doi:10.1016/j.ijheatmasstransfer.2017.09.051

Cited by 29 publications

(5 citation statements)

References 29 publications

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“…Based on single material packed bed, the heat and mass transfer performance and dehumidification efficiency are improved by optimizing the system structure design. Shamim et al [16] designed a new type of multi-layer fixed bed adhesive free dehumidifier, as shown in Figure 1a, which used silicon based highpurity spherical gel as adsorbent and combined with the steam compression system to improve the dehumidification efficiency while reducing power consumption. When the thickness of bed D was 1 mm, the air velocity v was 0.6 m/s, and the moisture content of inlet air w 0 was 16.5 g/kg, the average dehumidification efficiency of the system in the first 10 mins was 35.96% higher than that of the traditional dehumidifier wheel.…”

Section: Single Materials Packed Bedmentioning

confidence: 99%

“…The solid dehumidification device usually uses lowgrade thermal energy as the driving energy, including solar energy [6][7][8], waste heat [9][10][11][12] and so on, which greatly reduces energy consumption and environmental pollution [13]. Solid dehumidification devices can generally be divided into desiccant wheel (DW) [14][15], fixed (packed) bed [16,17] and desiccant-coated heat exchangers (DCHEs) [18,19]. The DW can realize continuous dehumidification and regeneration process with compact structure and wide application.…”

Section: Introductionmentioning

confidence: 99%

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Research Progress of Fixed Bed Dehumidification System: A Mini Review

Xiao

Han

2022

J. Solar Eneg. Res. Updat.

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In recent years, the fixed bed dehumidification system has received extensive attention. Research shows that the fixed bed can be combined with the vapor compression refrigeration system to replace the traditional air conditioning (A/C) system, improve the dehumidification efficiency of the system and reduce energy consumption of A/C. In this study, the optimization and improvement methods of the fixed bed dehumidifier in recent years are introduced in detail firstly. It points out that adding heating/cooling devices to the fixed bed can greatly improve the dehumidification capacity and efficiency of the system, which is the main method to improve the fixed bed currently; Optimizing the structure of fixed bed is also an effective method, but the current research results have limited improvement on dehumidification performance; Optimizing the regeneration mode of fixed bed can improve the utilization rate of renewable energy and improving the overall dehumidification efficiency of the system, but the research in the direction is still insufficient; The parallel double packed bed structure can ensure the continuous operation of the fixed bed to improve the dehumidification efficiency of the system, but such systems are large in scale and high in cost. Then the dehumidification performances of various systems are summarized and comprehensively compared. Finally, the future optimization and improvement direction of the fixed bed is pointed out.

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Section: Single Materials Packed Bedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research Progress of Fixed Bed Dehumidification System: A Mini Review

Xiao

Han

2022

J. Solar Eneg. Res. Updat.

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“…There are several research on the solid desiccant dehumidification utilized the packed bed [7], fluidized bed [8], rotating wheel [9] and sheet-type bed [10]. Nonetheless, the solid-desiccant packed-bed dehumidification system is widely used due to its upscalability and effective moisture adsorption.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Study on a Novel Temperature Breakpoint Cyclic Operation to Enhance Desiccant Packed Bed Performance

Murathathunyaluk¹,

Kitchaiya²

2021

IJHT

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In a conventional desiccant packed bed dehumidification, the adsorption and desorption operations switched at a constant cycle. However, this Conventional Steady Cyclic (CSC) operation was not performed well under disturbances. Therefore, a Temperature Breakpoint Cyclic (TBC) operation is proposed. A numerical model of the desiccant packed bed dehumidification system has been constructed and validated. The model was then used to assess the desiccant packed bed dehumidification performances in term of moisture removal capacity (MRC) and dehumidification coefficient of performance (DCOP) under various cycle times and temperature factors. The calculation results showed that under CSC, larger amounts of energy were required in the desorption operation, while the TBC exhibited higher performances in term of both MRC and DCOP. Notably, at a high regeneration temperature, the MRC of the TBC was 10% higher than the CSC’s; moreover, the DCOP of the TBC was twice higher than the CSC’s. In other words, at high recovery temperature, both operations exhibited comparable capacities while the energy cost was halved under TBC operation.

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“…Ambient air temperature and humidity are those major factors that have great impact and contribution in postharvest losses [3]. However, product quality (shape, firmness, color) can be sustained considerably by reducing the PHL [3][4][5][6]. Reduction of PHL can be achieved by providing the proper cooling and storage conditions to products straight after their harvest that will ultimately control the nutritional level and increase the shelf-storage life.…”

Section: Introductionmentioning

confidence: 99%

Investigating Applicability of Heat-Driven Desiccant Dehumidification System for Shelf Life Improvement of Fruits and Vegetables

Hussain¹,

Bilal²,

Sultan³

et al. 2020

Proceedings of International Exchange and Innovation Conference on Engineering &Amp; Sciences (IEICES)

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Fruits and vegetables are considered as highly perishable commodities and deteriorate very rapidly if not handled properly. Present study accentuates on use of desiccant air-conditioning (DAC) system for the storage of fruits and vegetables in challenging climatic conditions of Pakistan. The respiration and transpiration are the factors influencing the products quality and quantity. Post-harvest loss is one of the major concerns in storage life of fruits and vegetables. In this regard, more than half of the population in Pakistan experiencing food insecurity. Under these circumstances, conventional vapor compression air conditioning (VCAC) systems are being used globally to overcome the post-harvest losses but these systems are either expensive or unsuccessful. Therefore, to maintain the post-harvest nutritious value and shelf life of stored fruits and vegetables; a clean, low-cost, and energy efficient DAC system is presented in this study which can be maneuvered on low-grade waste heat, solar thermal energy and biomass.

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Design and performance evaluation of a multilayer fixed-bed binder-free desiccant dehumidifier for hybrid air-conditioning systems: Part I – experimental

Cited by 29 publications

References 29 publications

Research Progress of Fixed Bed Dehumidification System: A Mini Review

Research Progress of Fixed Bed Dehumidification System: A Mini Review

Theoretical Study on a Novel Temperature Breakpoint Cyclic Operation to Enhance Desiccant Packed Bed Performance

Investigating Applicability of Heat-Driven Desiccant Dehumidification System for Shelf Life Improvement of Fruits and Vegetables

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