Optimization of power density and metal-to-adsorbent weight ratio in coated adsorbers for adsorptive heat transformation applications

Bendix, Phillip; Füldner, Gerrit; Möllers, Marc; Kummer, Harry; Schnabel, Lena; Henninger, Stefan K.; Henning, Hans–Martin

doi:10.1016/j.applthermaleng.2017.05.165

Cited by 42 publications

(35 citation statements)

References 20 publications

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“…Δ( T middle – T low ) should be comparable large to Δ( T high – T middle ) in order to allow the production of cold at higher back‐cooling temperatures, thus allowing a broader temperature‐range where materials can be used. While optimized prototype low temperature ADCs utilizing silica gels or salt loaded silica gels have SCPs between 78 and 230 W kg Ads −1 , most recently reported ADCs containing TiAPSO, SAPO‐34,[5c,18] or MIL‐53‐FUM coated HXs exhibited mean powers, SCPs and VSCPs in the same value range as observed for CAU‐10‐H but at higher driving temperatures of 90 °C (Table S5, Supporting Information). As demonstrated here, the strength of CAU‐10‐H for the use in cooling applications are its low desorption temperature (70 °C) at large Δ( T middle – T low ) and small Δ( T high – T middle ) values.…”

Section: Measurement Details Of Cau‐10‐h Coated Hxmentioning

confidence: 81%

“…Only few results on full‐scale HX using SAPOs and MOFs have been reported so far. [5c,6,15] A quantitative comparison of these systems is hard to draw due to the differences in desorption and adsorption conditions as well as measurement methods. The most important parameters to take into account are the temperature levels T high / T middle / T low , respectively the temperature difference Δ( T high – T middle ) and Δ( T middle – T low ).…”

Section: Measurement Details Of Cau‐10‐h Coated Hxmentioning

confidence: 99%

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Scalable Green Synthesis and Full‐Scale Test of the Metal–Organic Framework CAU‐10‐H for Use in Adsorption‐Driven Chillers

et al. 2017

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The demand for cooling devices has increased during the last years and this trend will continue. Adsorption-driven chillers (ADCs) using water as the working fluid and low temperature waste energy for regeneration are an environmentally friendly alternative to currently employed cooling devices and can concurrently help to dramatically decrease energy consumption. Due to the ideal water sorption behavior and proven lifetime stability of [Al(OH)(m-BDC)] ∙ x H O (m-BDC = 1,3-benzenedicarboxylate), also denoted CAU-10-H, a green very robust synthesis process under reflux, with high yields up to 95% is developed and scaled up to 12 kg-scale. Shaping of the adsorbent is demonstrated, which is important for an application. Thus monoliths and coatings of CAU-10-H are produced using a water-based binder. The composites are thoroughly characterized toward their mechanical stability and water sorption behavior. Finally a full-scale heat exchanger is coated and tested under ADC working conditions. Fast adsorption dynamic leads to a high power output and a good power density. A low regeneration temperature of only 70 °C is demonstrated, allowing the use of low temperature sources like waste heat and solar thermal collectors.

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Section: Measurement Details Of Cau‐10‐h Coated Hxmentioning

confidence: 81%

Section: Measurement Details Of Cau‐10‐h Coated Hxmentioning

confidence: 99%

Scalable Green Synthesis and Full‐Scale Test of the Metal–Organic Framework CAU‐10‐H for Use in Adsorption‐Driven Chillers

et al. 2017

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“…The amount of adsorbent material loaded inside the HX was much lower than that of the packed bed because the coating thickness of 0.12 mm maximizes the heat and mass transfer efficiency, thus achieving a specific power as high as possible. Figure 5 shows a series of the flat tube-fin HXs coated with TiAPSO SCT-323 from Clariant AG, Bitterfeld, with binder SILRES MP 50 E from Wacker Chemie AG [33]. The HX without coating and flanges had a weight of 0.465 kg and was completely made of aluminum.…”

Section: Flat Tube-fin-coatedmentioning

confidence: 99%

“…The mass of the HTF (water) inside the flat tubes was 0.1 kg, and in the headers and the additional tubes was 0.15 kg. Figure 5 shows a series of the flat tube-fin HXs coated with TiAPSO SCT-323 from Clariant AG, Bitterfeld, with binder SILRES MP 50 E from Wacker Chemie AG [33]. The HX without coating and flanges had a weight of 0.465 kg and was completely made of aluminum.…”

Section: Flat Tube-fin-coatedmentioning

confidence: 99%

Experimentally Measured Thermal Masses of Adsorption Heat Exchangers

et al. 2020

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The thermal masses of components influence the performance of many adsorption heat pump systems. However, typically when experimental adsorption systems are reported, data on thermal mass are missing or incomplete. This work provides original measurements of the thermal masses for experimental sorption heat exchanger hardware. Much of this hardware was previously reported in the literature, but without detailed thermal mass data. The data reported in this work are the first values reported in the literature to thoroughly account for all thermal masses, including heat transfer fluid. The impact of thermal mass on system performance is also discussed, with detailed calculation left for future work. The degree to which heat transfer fluid contributes to overall effective thermal mass is also discussed, with detailed calculation left for future work. This work provides a framework for future reporting of experimental thermal masses. The utilization of this framework will enrich the data available for model validation and provide a more thorough accounting of adsorption heat pumps.

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“…More recent developments have shown that better performances are obtained when the adsorbing solid is shaped as a coating covering the heat exchanger surfaces. A coating has several advantages compared to the loose powder because the interface contact is improved and the quantity of porous material needed is optimized as well as the mechanical and thermal stability of the adsorber module [27,28]. Several different solutions have been proposed, like the direct synthesis of the adsorbing material on the heat exchanger surfaces [29,30] or the use of binders and ligands to make coatings [23,31] or the use of metallic or polymeric fibres or foams [32][33][34][35].…”

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confidence: 99%

Manufacturing and Assessment of Electrospun PVP/TEOS Microfibres for Adsorptive Heat Transformers

et al. 2019

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A new adsorbent coating for the adsorber unit of an adsorption heat pump made of hybrid, organic-inorganic microfibres was prepared and characterized. Different coatings were obtained by the electrospinning of polyvinylpyrrolidone (PVP) solutions added with different quantities of tetraethyl orthosilicate (TEOS). PVP is a polymer with water adsorption capability and the TEOS addition allowed to increase the thermal stability of microfibres. The aim, indeed, was to preserve the polymeric structure of microfibres in order to obtain coatings with high flexibility and mechanical strength. The results demonstrated that TEOS concentrations in the range of 5-13 wt.% produced microfibre coatings of non-woven textile structure with both good water affinity and good thermal stability. SEM images of coatings showed that the deposited microfibre layers have both a high surface area and a high permeability representing a significant advantage in adsorption systems.Coatings 2019, 9, 443 2 of 12 and silica tetrahedra that form a crystalline nanoporous structure with hydrophilic behavior [14,15]. Although zeolites are the ideal adsorbing solid for the elevated thermal stability, their use in adsorption systems is limited by the high regeneration temperatures. The desorption of water vapor from the zeolite porosity requires temperatures above 300 • C for the complete material dehydration [16,17]. The ideal exploitation of this technology, indeed, is the coupling with low temperature heat sources (T < 150 • C), like solar thermal panels or waste combustion fumes [11,18]. For such a reason, other adsorbing materials have been proposed and sometimes used in solid sorption applications, like silica gel, alumino-phosphour zeotypes (AlPO and SAPO), and metalorganic frameworks (MOF). AlPO and SAPO are interesting for their high adsorption capacity, their good structural stability, and low regeneration temperatures but they are difficult to find on the market and costly [19,20]. MOF are new adsorbing materials with large water capacity and low regeneration temperatures, but their structural stability is still an open issue and they are expensive and difficult to find in large quantities [21,22]. Among others, silica gel is the adsorbent most used in commercial adsorption chillers mainly for its low cost and large availability on the market although it shows a lower water adsorption capacity and problems of morphological and thermal stability [22][23][24][25].Over the years, the scientific community has focused not only on the development of the porous material but also on the engineering of the absorber, the heat exchanger module where the adsorbent material is located. In order to reduce heat transfer resistances, the porous material distribution around the heat exchanger surfaces is very important. Zeolites and silica gel are generally used in form of granules or powder and the simplest and most used solution is to fill the free space between the fins of the heat exchanger with the adsorbent granules. In this case, however, the poor co...

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Optimization of power density and metal-to-adsorbent weight ratio in coated adsorbers for adsorptive heat transformation applications

Cited by 42 publications

References 20 publications

Scalable Green Synthesis and Full‐Scale Test of the Metal–Organic Framework CAU‐10‐H for Use in Adsorption‐Driven Chillers

Scalable Green Synthesis and Full‐Scale Test of the Metal–Organic Framework CAU‐10‐H for Use in Adsorption‐Driven Chillers

Experimentally Measured Thermal Masses of Adsorption Heat Exchangers

Manufacturing and Assessment of Electrospun PVP/TEOS Microfibres for Adsorptive Heat Transformers

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