Kinetics of water adsorption/desorption under isobaric stages of adsorption heat transformers: The effect of isobar shape

Glaznev, I.S.; Ovoshchnikov, D.S.; Aristov, Yu. I.

doi:10.1016/j.ijheatmasstransfer.2008.09.031

Cited by 39 publications

(9 citation statements)

References 11 publications

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“…Moreover, the predicted step positions (α) of COFs in Figure 3d−f demonstrated that all high-performing COFs generally exhibited lower step positions (α ≤ 0.4) under varying working conditions, consistent with the preferential stepwise adsorption or type V isotherm from both the thermodynamic and energetic perspectives. 14,36,38,39 Specifically, COFs with 0.2 < α ≤ 0.4 are favorable for heating and cooling, whereas COFs with 0 < α ≤ 0.2 are better candidates for ice making, which is resulted from the high working capacity at defined operating conditions (Figure S6). Besides, the top-performing COFs exhibited not only the high working capacity (ΔW) and relatively low step positions but also the moderate averaged enthalpy of adsorption (−⟨ΔH ads ⟩ ∼40 kJ/mol), both of which are favorable for the COP of MOFs (Figures S7 and S8).…”

Section: Methodsmentioning

confidence: 99%

Screening of Covalent–Organic Frameworks for Adsorption Heat Pumps

Xia

Song

2019

ACS Appl. Mater. Interfaces

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Exploring high-performing adsorption-driven heat pumps (AHPs) remains a challenging task owing to the low working capacity, high regeneration temperature, and low energy efficiency of conventional adsorbents. Quick discovery of the novel promising adsorbents could help to improve the coefficient of performance of AHPs for heating (COP H ) and cooling (COP C ). Herein, we reported an approach to identify the high-performing covalent−organic frameworks (COFs) for heating, cooling, and ice making by high-throughput computational screening based on grand canonical Monte Carlo simulations and, for the first time, machine learning. It was demonstrated that compared with metal−organic frameworks (MOFs), COFs were more suitable adsorbents of AHPs for cooling because of their weak interaction toward ethanol that favors stepwise adsorption. Structure−property relationship analysis revealed that the average enthalpy of adsorption commensurate with the enthalpy of evaporation will benefit the performance of AHPs besides the high working capacity and low step positions of adsorption isotherms. In order to reduce the computational cost of screening, a random forest model was developed to successfully predict the COP C of both COFs and MOFs.

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Section: Methodsmentioning

confidence: 99%

Screening of Covalent–Organic Frameworks for Adsorption Heat Pumps

Xia

Song

2019

ACS Appl. Mater. Interfaces

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“…Regardless of the type of adsorbent, material with high uptake at lower partial pressure, and having stepwise isotherm is preferred as this will give better efficiency and performance [35,36]. Furthermore, the phenomenon of hysteresis is undesired for the adsorption process as this will cause a loss of inefficiency.…”

Section: Physical Adsorbents and Desired Adsorption Behaviormentioning

confidence: 99%

Evaluation of Metal–Organic Frameworks as Potential Adsorbents for Solar Cooling Applications

Rafique

2020

ASI

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The reduction of carbon dioxide emissions has become a need of the day to overcome different environmental issues and challenges. The use of alternative and renewable-based technologies is one of the options to achieve the target of sustainable development through the reduction of these harmful emissions. Among different technologies thermally activated cooling systems are one which can reduce the harmful emissions caused by conventional heating, ventilation, and air conditioning technology. Thermal cooling systems utilize different porous materials and work on a reversible adsorption/desorption cycle. Different advancements have been made for this technology but still a lot of work should be done to replace conventional systems with this newly developed technology. High adsorption capacity and lower input heat are two major requirements for efficient thermally driven cooling technologies. In this regard, it is a need of the day to develop novel adsorbents with high sorption capacity and low regeneration temperature. Due to tunable topologies and a highly porous nature, the hybrid porous crystalline materials known as metal–organic frameworks (MOFs) are a great inspiration for thermally driven adsorption-based cooling applications. Keeping all the above-mentioned aspects in mind, this paper presents a comprehensive overview of the potential use of MOFs as adsorbent material for adsorption and desiccant cooling technologies. A detailed overview of MOFs, their structure, and their stability are presented. This review will be helpful for the research community to have updated research progress in MOFs and their potential use for adsorption-based cooling systems.

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“…In addition to these properties, the shape of the characteristic curve has a high influence on power density: Okunev et al [70] and Glaznev et al [71] found that the concave shape of the adsorption isobars influences the sorption process and leads to a slower adsorption process than the desorption process. Aristov [72] concluded in a theoretic study that a step adsorption isobar is preferable and Okunev et al [73] refined this study by modeling the adsorption isobar with a consistent model for equilibrium, heat transfer, and diffusion.…”

Section: The Potential Of Mofsmentioning

confidence: 99%

Toward Optimal Metal–Organic Frameworks for Adsorption Chillers: Insights from the Scale‐Up of MIL‐101(Cr) and NH₂‐MIL‐125

et al. 2019

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The metal-organic frameworks (MOFs) MIL-101(Cr) and NH 2-MIL-125 offer high adsorption capacities and have therefore been suggested for sustainable energy conversion in adsorption chillers. Herein, these MOFs are benchmarked to commercial Siogel. The evaluation method combines small-scale experiments with dynamic modeling of full-scale adsorption chillers. For the common temperature set 10/30/80 C, it is found that MIL-101(Cr) has the highest adsorption capacity, but considerably lower efficiency (À19%) and power density (À66%) than Siogel. NH 2-MIL-125 increases efficiency by 18% compared with Siogel, but reduces the practically important power density by 28%. From the results, guidelines for MOF development are derived: High efficiencies are achieved by matching the shape of the isotherms to the specific operating temperatures. By only adapting shape, efficiencies are 1.5 times higher. Also, higher power density requires matching the shape of the isotherms to create high driving forces for heat and mass transfer. Second, if MOFs' heat and mass transfer coefficients could reach the level of Siogel, their maximum power density would double. Thus, development of MOFs should go beyond adsorption capacity, and tune the structure to the application requirements. As a result, MOFs could to serve as optimal adsorbents for sustainable energy conversion.

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Kinetics of water adsorption/desorption under isobaric stages of adsorption heat transformers: The effect of isobar shape

Cited by 39 publications

References 11 publications

Screening of Covalent–Organic Frameworks for Adsorption Heat Pumps

Screening of Covalent–Organic Frameworks for Adsorption Heat Pumps

Evaluation of Metal–Organic Frameworks as Potential Adsorbents for Solar Cooling Applications

Toward Optimal Metal–Organic Frameworks for Adsorption Chillers: Insights from the Scale‐Up of MIL‐101(Cr) and NH₂‐MIL‐125

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Kinetics of water adsorption/desorption under isobaric stages of adsorption heat transformers: The effect of isobar shape

Cited by 39 publications

References 11 publications

Screening of Covalent–Organic Frameworks for Adsorption Heat Pumps

Screening of Covalent–Organic Frameworks for Adsorption Heat Pumps

Evaluation of Metal–Organic Frameworks as Potential Adsorbents for Solar Cooling Applications

Toward Optimal Metal–Organic Frameworks for Adsorption Chillers: Insights from the Scale‐Up of MIL‐101(Cr) and NH2‐MIL‐125

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Toward Optimal Metal–Organic Frameworks for Adsorption Chillers: Insights from the Scale‐Up of MIL‐101(Cr) and NH₂‐MIL‐125