Experimental chiller with silica gel: Adsorption kinetics analysis and performance evaluation

Vodianitskaia, Paulo J.; Soares, José Josimar; Melo, H.M.C. de; Gurgel, José Maurício

doi:10.1016/j.enconman.2016.11.028

Cited by 48 publications

(19 citation statements)

References 21 publications

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“…Adsorption desalination is a novel thermally driven method that can utilise heat as low as 50°C [15] with the potential to fill the ultra-low temperature niche. Most systems apply silica gel-water as working pair in desalination [15][16][17] as well as refrigeration [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Cycle and performance analysis of a small-scale adsorption heat transformer for desalination and cooling applications

Olkis

Brandani

Santori

2019

Chemical Engineering Journal

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Adsorption heat transformers use low-grade heat to produce potable water and provide cooling at the same time. In this study, we present a comprehensive performance analysis for an experimental system featuring the world's smallest design using silica gel, which is commonly used as benchmarking material. We analyse the system performance in a thorough cycle analysis that quantifies the influence of isosteric heating times and cycle times onto the adsorption working capacity. In addition, the performance is assessed through common performance indicators for desalination as well as cooling. We found that the system achieved a Specific Daily Water Production of up to 10.9 kg w /(kg sg d) at 80°C. The combination of cooling and desalination is discussed highlighting advantages as well as disadvantages, which are often neglected. The results show that silica gel has a high performance in desalination, which decreases by more than 60 % if cooling is desired as well.

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Section: Introductionmentioning

confidence: 99%

Cycle and performance analysis of a small-scale adsorption heat transformer for desalination and cooling applications

Olkis

Brandani

Santori

2019

Chemical Engineering Journal

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“…4). Each sub adsorber is packed with TYPE A granular silica gel (mass of 9 kg) in the spacing of the fins which can expand the heat transfer area to improve its heat transfer performance effectively [24]. Both condensers and evaporators are a kind of shell tube type heat exchangers in which the heat transfer fluid flows inside the tube and the refrigerant flows outside.…”

Section: Small-scale Silica Gel-water System and Its Working Processesmentioning

confidence: 99%

A small-scale silica gel-water adsorption system for domestic air conditioning and water heating by the recovery of solar energy

Pan

Wang

2019

Front. Energy

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A small-scale silica gel-water adsorption system with modular adsorber, which utilizes solar energy to achieve the cogeneration of domestic air conditioning and water heating effect, is proposed and investigated in this paper. A heat recovery process between two adsorbers and a mass recovery process between two evaporators are adopted to improve the overall cooling and heating performance. First, the adsorption system is tested under different modes (different mass recovery, heat recovery, and cogeneration time) to determine the optimal operating conditions. Then, the cogeneration performance of domestic cooling and water heating effect is studied at different heat transfer fluid temperatures. The results show that the optimal time for cogeneration, mass recovery, and heat recovery are 600 s, 40 s, and 40 s, respectively. When the inlet temperature of hot water is around 85°C, the largest cooling power and heating power are 8.25 kW and 21.94 kW, respectively. Under the condition of cooling water temperature of 35°C, the obtained maximum COP c , COP h , and SCP of the system are 0.59, 1.39, and 184.5 W/kg, respectively.

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“…Another way to increase the COP is to use a coated bed construction, where the adhesive layer allows reducing the porosity in the boundary layer of the heat exchanger [ 14 , 15 ]. In this configuration of the adsorption bed, optimal parameters, due to heat and mass transfer, depend on the valid selection of the sorbent–adhesive pair.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Adhesive Additives on Silica Gel Water Sorption Properties

Sztekler

Kalawa

Mlonka-Mędrala

et al. 2020

Entropy

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Adsorption chillers are characterized by low electricity consumption, lack of moving parts, and high reliability. The disadvantage of these chillers is their large weight due to low adsorbent sorption capacity. Therefore, the attention is turned to finding a sorbent with a high water sorption capacity and enhanced thermal conductivity to increase chiller efficiency. The article discusses the impact of selected adhesives used for the production of an adsorption bed in order to improve heat exchange on its surface. Experiments with silica gel with three commercial types of glue on metal plates representing heat exchanger were performed. The structure of samples was observed under a microscope to determine the coverage of adsorbent by glue. To determine the kinetics of the free adsorption, the amounts of moisture adsorbed and the desorption dynamics the prepared samples of coated bed on metal plates were moisturized and dried in a moisture analyzer. Samples made of silica gel mixed with the adhesive 2-hydroxyethyl cellulose, show high adsorption capacity, low dynamic adsorption, and medium dynamic desorption. Samples containing adhesive poly(vinyl alcohol) adsorb less moisture, but free adsorption and desorption were more dynamic. Samples containing the adhesive hydroxyethyl cellulose show lower moisture capacity, relatively dynamic adsorption, and lower dynamic desorption.

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Experimental chiller with silica gel: Adsorption kinetics analysis and performance evaluation

Cited by 48 publications

References 21 publications

Cycle and performance analysis of a small-scale adsorption heat transformer for desalination and cooling applications

Cycle and performance analysis of a small-scale adsorption heat transformer for desalination and cooling applications

A small-scale silica gel-water adsorption system for domestic air conditioning and water heating by the recovery of solar energy

The Effect of Adhesive Additives on Silica Gel Water Sorption Properties

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