An Industrial Approach for the Optimization of a New Performing Coated Adsorber for Adsorption Heat Pumps

Calabrese, Luigi; Mittelbach, Walter; Bonaccorsi, Lucio; Freni, Angelo

doi:10.3390/en15145118

Cited by 5 publications

(4 citation statements)

References 33 publications

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“…For the fabrication of binder-based adsorbent coating, the adsorbent powder is mixed with a binder and a solvent to obtain a slurry, which can be further deposited on the HEx surface by several methods [34]. The binder-based coating is a mature technique widely applied to obtain films of various adsorbents, including zeolite SAPO-34 [7], MOFs-aluminum fumarate [35], MIL-101(Cr), and HKUST-1 [36], MIL-160 [37], MIL-100(Fe) [38], composite sorbents LiCl/(Wakkanai siliceous shale) [39], etc. Various adhesive compounds of organic (PVA [35,40], polyvinylpyrrolidone [40,41], hydroxyethyl cellulose [35], silicones [36,42], silanes [20,43], gelatine [40], etc.)…”

Section: Binder-based Adsorbent Coatingsmentioning

confidence: 99%

“…The comparison of AHT with conventional compression technologies revealed that the main drawback of ACs and AHPs is their large size, which is related to low specific power (SP), and high equipment cost [5]. The high cost of about 1000 Euro/kW is compensated by lower operating costs and saves 60-80% of electricity [7]. The first adsorptive chillers of 50-1000 kW power entered the market as early as 1986 from two Japanese companies, Nishiyodo Kuchouki [8] and Mycom [9].…”

Section: Introductionmentioning

confidence: 99%

“…However, the use of this method can be restricted by the depth of the suspension flow inside the channels, which can result in the formation of an irregular and non-homogeneous film [34]. Usually, a slurry containing the adsorbent, binder, and solvent is used for spaying [7,57]. Ge et al [56] developed a binderless spray-coating method, where the suspension of fine aluminum-based MOFs (MIL-96 and MIL-100) powder in water was sprayed on the HEx surface.…”

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confidence: 99%

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Adsorbent Coatings for Adsorption Heat Transformation: From Synthesis to Application

Gordeeva

Aristov

2022

Energies

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In recent years, growing energy demands and environmental pollution caused by the extensive use of fossil fuels have inspired considerable research interest in adsorptive heat transformation (AHT). This technology offers effective utilization of low-grade solar or waste thermal energy for cooling and heating with low environmental impact. Increasing the AHT power is a keystone for further development and dissemination of this emerging technology. The AHT power is mainly determined by ad/desorption dynamics, which is significantly hindered by slow heat transfer between the adsorbent and heat exchanger. Shaping the adsorbent bed as a coating on the heat exchanger surface is considered an effective route to enhance heat transfer and increase the AHT power. In this review, the technology of adsorbent coating for AHT is comprehensively surveyed, including coating synthesis, adsorption dynamics, and use in real AHT devices. The advantages of the coated bed configuration are considered, and its challenges are outlined. Finally, recommendations for better organization of the coating’s structure for rational control of the relative contributions of heat and mass transfer are considered.

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Section: Binder-based Adsorbent Coatingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Adsorbent Coatings for Adsorption Heat Transformation: From Synthesis to Application

Gordeeva

Aristov

2022

Energies

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“…The SP of AHTS systems is mainly affected by the dynamics of the adsorption and desorption stages of the working cycle, governed by coupled heat and mass transfer in the adsorber-heat exchanger (Ad-HEx) unit. In this vein, the optimization of the Ad-HEx 2 of 16 configuration is becoming a hot topic of research related to AHTS technology [4][5][6]. Nowadays, two basic Ad-HEx configurations are widely used, namely, the loose adsorbent grains loaded between the HEx fins and the thin adsorbent coating on the HEx surface [7,8].…”

Section: Introductionmentioning

confidence: 99%

Water Adsorption Dynamics on Metal–Organic Framework MOF-801: Comparative Study of Loose and Glued Grains, and Coatings

Solovyeva,

Gordeeva

2023

Nanomaterials

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Adsorption heat transformation and storage (AHTS) is an environmentally benign and energy-saving alternative to common compression chillers and heat pumps. The low specific power (SP) of adsorption systems is a key drawback that hinders their broader dissemination. The optimization of adsorption dynamics is a prerequisite for SP enhancement. In this work, we studied the dynamics of water vapor adsorption on MOF-801—a promising adsorbent for AHTS. For the first time, two configurations of compact MOF-801 bed, namely, grains glued to the surface of a metal support and thin adsorbent coatings, are prepared, and their porous structure is characterized. The water adsorption dynamics is compared with a common loose grains configuration. The main findings are: (a) the binder can both accelerate and decelerate the water adsorption, and its chemical nature is subject to careful selection; (b) at the initial time, heat transfer between the support and adsorbent bed controls the adsorption rate, and, at a longer time, mass transfer starts to affect it; (c) polyvinylpyrrolidone, bentonite, thermal grease, and hydroxyethylcellulose increase the heat transfer coefficients and accelerate adsorption; polyvinyl alcohol and polyaniline slow it down; and (d) for the coatings prepared with polyvinylpyrrolidone, an SP of 1.6–5.1 kW/kg can be achieved, which is about twice that for the loose grains. The new configurations can be recommended for effective but expensive adsorbents such as MOFs, and their implementation will contribute to the further spread of AHTS technology.

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Water Adsorption in MOFs: Structures and Applications

Zhang

Zhu

Wang

et al. 2023

Adv Funct Materials

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Metal–organic frameworks (MOFs) are superior sorbents for water adsorption‐based applications. The unique step‐like water isotherm at a MOF‐specific relative pressure allows easy loading and regeneration over a small range of temperature and pressure conditions. With good hydrothermal stability and cyclic durability, it stands out over classical sorbents used in applications for humidity control, water harvesting, and adsorption‐based heating and cooling. These are easily regenerated at moderate temperatures using “waste” heat or solar heating. The isotherm thermodynamics and adsorption mechanisms are described, and the presence of MOFs in the water–air system is explained. Based on six selection criteria ≈40 reported MOFs and one COF are identified for potential application. Trends and approaches in further synthesis optimization and production scale‐up are highlighted. No‐MOF‐fits‐all, each MOF has its own specific step location matching only with a certain application type. Most applications are technically feasible and demonstrated on the bench‐scale or small pilot. Their maturity is benchmarked by their technology readiness level. Retrofitting existing applications with MOFs replacing classical desiccants may lead to rapid demonstration. Studies on techno‐economic analysis and life cycle analysis are required for a rational evaluation of the feasibility of promising applications.

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An Industrial Approach for the Optimization of a New Performing Coated Adsorber for Adsorption Heat Pumps

Cited by 5 publications

References 33 publications

Adsorbent Coatings for Adsorption Heat Transformation: From Synthesis to Application

Adsorbent Coatings for Adsorption Heat Transformation: From Synthesis to Application

Water Adsorption Dynamics on Metal–Organic Framework MOF-801: Comparative Study of Loose and Glued Grains, and Coatings

Water Adsorption in MOFs: Structures and Applications

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