Application of silica gel fluidised bed for air-conditioning systems

Chen, Chih‐Hao; Schmid, Gerd; Chan, Chi-Tong; Chiang, Yuan-Ching; Chen, Sih‐Li

doi:10.1016/j.applthermaleng.2015.05.058

Cited by 20 publications

(14 citation statements)

References 19 publications

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“…The fan (4) blows the air through the air cooler (5). The cooled air enters the fluidised bed (3). Because of the adsorption, the air is dehumidified and warmed up.…”

Section: Modellingmentioning

confidence: 99%

“…Unlike adsorption cooling [1,2], it does not require low pressure maintenance, which greatly affects investment costs. On the other hand, when compared to fixed beds systems, it provides increased adsorption kinetics and a lower air pressure drop [3]. This technology is at the early stage of development, however, a few prototypes of fluidised desiccant dehumidifiers (fluidised beds) have been already developed.…”

Section: Introductionmentioning

confidence: 99%

“…The performance of the FDC should be assessed and compared to the performance of the reference technologies, such as adsorption cooling [3] and vapor-compression cooling [8,9]. The adsorption chillers are reported to feature a thermal COP ranging from 0.5 to 0.6 [10] (while driven by similar heating and cooling temperatures to the FDC).…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Operating Parameters on Adsorption/Desorption Characteristics and Performance of the Fluidised Desiccant Cooler

2018

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This paper concerns the issue of the proper selection of the operating parameters of the fluidised desiccant cooler. Despite the fact that fluidised desiccant cooling technology is being reported in the literature as an efficient way to provide cooling for the purposes of airconditioning , the improper control of its operation can lead to a significantly worse performance than expected. The objective of the presented theoretical study is to provide guidelines on the proper selection of such operating parameters of a fluidized desiccant cooler, such as superficial air velocity, desiccant particle diameter, bed switching time, and desiccant filling height. The influence of the chosen operating parameters on the performance of fluidised desiccant cooling technology is investigated based on their impact on electric and thermal coefficients of performance (COP) and specific cooling power (SCP). Moreover, the influence of the outlet air temperature, humidity, and desiccant water uptake on the adsorption/desorption characteristics was investigated, contributing to better understanding of sorption processes.

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“…The fan (4) blows the air through the air cooler (5). The cooled air enters the fluidised bed (3). Because of the adsorption, the air is dehumidified and warmed up.…”

Section: Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Influence of Operating Parameters on Adsorption/Desorption Characteristics and Performance of the Fluidised Desiccant Cooler

2018

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“…A periodic operating silica gel fluidized bed unit to adsorb/desorb moisture in air-conditioning systems was proposed by Chen et al [18] The authors reported possibility to increase the adsorption and desorption processes in that the fluidized bed system compared with the unit equipped with a packed bed.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer in fluidized and fixed beds of adsorption chillers

et al. 2019

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An innovative idea, shown in the paper constitutes in the use of the fluidized bed of sorbent, instead of the conventional, fixed-bed, commonly used in the adsorption chillers. Bed–to–wall heat transfer coefficients for fixed and fluidized beds of adsorbent are determined. Sorbent particles diameters and velocities of fluidizing gas are discussed in the study. The calculations confirmed, that the bed–to–wall heat transfer coefficient in the fluidized bed of adsorbent is muchhigher than that in a conventional bed.

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“…Increasing global energy consumption and strict policy related to energy efficiency led to intensified R&D works on energy systems powered by renewable or waste energy sources including solid [ 1 , 2 , 3 , 4 , 5 ] and liquid [ 6 , 7 , 8 ] desiccant cooling systems. According to [ 9 ], one can divide solid desiccant cooling systems into honeycomb desiccant wheel systems [ 10 , 11 ], packed bed systems [ 2 ], and fluidized bed systems [ 1 , 3 ]. The application of fluidized beds in solid desiccant cooling systems results in decreased bed pressure drop [ 3 ] and improved heat and mass transfer performance [ 12 ] in comparison with the packed bed systems.…”

Section: Introductionmentioning

confidence: 99%

Exergy Analysis of Fluidized Desiccant Cooling System

Rogala

Kolasiński

2019

Entropy

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One of the main challenges in the design and implementation of fluidized desiccant cooling (FDC) systems is increasing their low COP (coefficient of performance). Exergy analysis is one of the tools especially suitable for improvement and optimization of FDC systems. The improvement of performance is impossible as long as the main sources of exergy destruction are not identified and evaluated. In this paper, the exergy analysis was applied in order to identify these components and processes of the FDC system that are mainly responsible for exergy destruction. Moreover, the exergy efficiency of a simple fluidized desiccant cooler was determined. The results showed that fluidized beds and regenerative heat exchanger were the main exergy destruction sources with a 32% and 18% share of total exergy destruction, respectively. On the other hand, the direct evaporative cooler and air cooler placed after the desorbing fluidized bed were characterized by the lowest exergy efficiencies. This work contributes to better understanding of FDC operation principles and improvement of the performance of FDC technology.

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Application of silica gel fluidised bed for air-conditioning systems

Cited by 20 publications

References 19 publications

The Influence of Operating Parameters on Adsorption/Desorption Characteristics and Performance of the Fluidised Desiccant Cooler

The Influence of Operating Parameters on Adsorption/Desorption Characteristics and Performance of the Fluidised Desiccant Cooler

Heat transfer in fluidized and fixed beds of adsorption chillers

Exergy Analysis of Fluidized Desiccant Cooling System

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