Benefits of metal–organic frameworks sorbents for sorbent wheels used in air conditioning systems

Shahvari, Saba Zakeri; Kalkhorani, Vahid Ahmadi; Wade, Casey R.; Clark, Jordan D.

doi:10.1016/j.applthermaleng.2022.118407

Cited by 9 publications

(8 citation statements)

References 98 publications

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“…The dehumidification process has been proven to be such that MOF adsorbents are suitable, and they have features that make them attractive candidates for this application. [ 89 ]…”

Section: Polymer Materials In Sdc Systemmentioning

confidence: 99%

“…The dehumidification process has been proven to be such that MOF adsorbents are suitable, and they have features that make them attractive candidates for this application. [89] Shahvari and colleagues explored the possibilities of MOFs employed in a dehumidifier removing heat through evaporative cooling. [90] They studied CAU-23, Co 2 Cl 2 (BTDD), and CAU-10.…”

Section: Mofmentioning

confidence: 99%

“…The systems based on MOFs demonstrate their COP rises when the exterior RH gets close to that of MOF sorption step, implying that the suitable MOF for each exterior circumstance might be the MOF whose sorption step approaches that of the outdoors. DUT-67 (Zr) [62] NU-1000, UiO-66, UiO-67 [63] MOF-801 [64] Hydrophilic carboxylate based MOFs [65] Aluminum fumarate [66] CPO-27 (Ni) [67] Aluminum fumarate, CPO-27 (Ni), MIL-100 (Fe) [68] UiO-66 (Zr) [69] Sorption Chiller (Closed-loop) MOF-801 [70] MOF-801 [71] DUT-67 [72] Aluminum fumarate [73] Vapor Compression Fe 3 O(H 2 O) 2 OH(BTC) 2, MIL-100 (Fe) [74] DCHE Cu-BTC (HKUST-1) [75] Aluminum fumarate, FAM-Z01 [76] Aluminum fumarate [77] MIL-96 (Al), MIL-100 (Al) [78] Rotary wheel dehumidifier MIL-101 [79] MIL-101 (Cr) [80] MIL-100 (Fe) [81] Aluminum Fumarate, CAU-10, CAU-23, Co 2 Cl 2 (BTDD), CPO-27, KMF-1, MIL-125, MIL-125-(NH 2 ), MIL-160, MOF-840 [82] Aluminum fumarate [83] Figure 5 gives us a visual understanding of MOF collapsing after moisture sorption. Table 6 provides an overview of the water adsorption capabilities of the common MOFs.…”

Section: Mofmentioning

confidence: 99%

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Review on Polymer Materials for Solid Desiccant Cooling System

Liu,

Sundarrajan,

Kumar

et al. 2023

Macro Materials & Eng

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As an alternative form of vapor compression air conditioning devices, solid desiccant cooling (SDC) techniques have increasingly been explored recently. The overall performances of SDC primarily rely on the capability of dehumidification and regeneration of desiccant. A desiccant with a great uptake capability and excellent regeneration potential is preferred in an SDC system. Although traditional desiccants like silica gels and zeolites are able to absorb moisture at moderate levels, hygroscopic polymers show a superior ability in moisture sorption and desorption. Significant research has been conducted to investigate the hygroscopic polymers in SDC for household and industrial applications. Here, first, an introduction to SDC systems is presented, and then hygroscopic polymers from natural and synthetic origins are discussed. Synthetic polymers discussed are metal–organic frameworks (MOFs), covalent organic frameworks (COFs), covalent triazine frameworks (CTFs), amorphous porous organic polymers (POPs), polyelectrolytes, and polymer‐based composites. Their dehumidification behaviors in SDC systems, primarily desiccant‐coated heat exchanger (DCHE) systems, are compared and summarized. Binders employed in SDC systems are also summarized, as a proper binder enhances the overall performance of the desiccant system. It can be anticipated that hygroscopic polymers and binder materials would witness extensive applications in the future.

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“…The dehumidification process has been proven to be such that MOF adsorbents are suitable, and they have features that make them attractive candidates for this application. [ 89 ]…”

Section: Polymer Materials In Sdc Systemmentioning

confidence: 99%

Section: Mofmentioning

confidence: 99%

Section: Mofmentioning

confidence: 99%

See 1 more Smart Citation

Review on Polymer Materials for Solid Desiccant Cooling System

Liu,

Sundarrajan,

Kumar

et al. 2023

Macro Materials & Eng

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show abstract

“…In this regard, very promising adsorbents that are successfully emerging for this purpose have been identified in Metal-Organic Framework (MOF), a class of hybrid organicinorganic crystalline materials built upon metal-containing units linked to organic ligands through coordination bonds extending within a regular and porous framework. Their robustness, porosity and uncommonly high specific surface area (up to 6000 m 2 /g) have made MOFs an attractive proposal in adsorption applications [6,[15][16][17]. Nowadays, theoretical and experimental studies on MOF adsorption abilities have demonstrated great loading and selectivity performances for specific gasses, such as CO 2 and many volatile organic compounds [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…The Authors estimated a reduction of 20.5% in CO 2 emissions compared to the HVAC system with silica-gel. Shahvari et al explained the functioning of a MOF desiccant wheel [15], proposing a complete first-principle analysis validated with experimental tests. They showed that MOF-based wheels are regenerable at lower temperatures (40-60 • C) compared to silica-gel (80-140 • C), with consistent energy saving for regeneration (10-50%, depending on environmental conditions).…”

Section: Introductionmentioning

confidence: 99%

Metal-Organic Framework Adsorbent Materials in HVAC Systems: General Survey and Theoretical Assessment

et al. 2022

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In this paper, the use of Metal-Organic Framework (MOF) materials as an option for the energy efficiency enhancement of HVAC systems is investigated. In particular, the possibility of using MOFs as dehumidifying materials to reduce the latent load associated with the moisture content of the airflows is studied. A literature review is proposed, highlighting the benefits of using MOFs instead of other adsorbents (e.g., silica-gel) and discussing the unique features (high water uptake capacity and low regeneration temperatures) that make MOFs a preferential desiccant. The possibility to finely tune these properties is also underlined, reporting some explicative examples. A theoretical proposal of a psychrometric transformation, to be performed in a HVAC system equipped with a MOF-Assisted Dehumidifier (MAD), is presented. This transformation is compared with a traditional one (cooling and dehumidification operated by a cooling coil with low temperatures of the coolant). The preliminary numerical simulations, conducted on a reference case study in Florence, Italy, show an estimated energy saving of 30–50%, leading us to consider the use of this technology as a very competitive one in the air-conditioning sector.

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Sustainable, Low‐Cost Sorbents Based on Calcium Chloride‐Loaded Polyacrylamide Hydrogels

Hoogendoorn,

Huertas,

Nitz

et al. 2024

Adv Funct Materials

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Sorbents are promising materials for applications in atmospheric water harvesting, thermal energy storage, and passive cooling, thereby addressing central challenges related to water scarcity and the global energy transition. Recently, hygroscopic hydrogel composites have emerged as high‐performance sorbents. However, many of these systems are fabricated with unsustainable and costly sorbent materials, which hinders their wide deployment. Here, the synthesis of high‐performance, cost‐efficient polyacrylamide hydrogels loaded with unprecedented amounts of calcium chloride is demonstrated. To this end, the swelling procedure of polyacrylamide hydrogels in aqueous calcium chloride solutions is optimized. The achievable salt loading in the hydrogel is characterized as a function of temperature, calcium chloride concentration in the swelling solution, and the hydrogel preparation conditions. The obtained hydrogel‐salt composites are shown to be stable under repeated sorption‐desorption cycling and enable water uptakes of 0.92 and 2.38 grams of water per gram of dry materials at 30% and 70% relative humidity, respectively. The resulting cost‐performance ratio substantially exceeds lithium chloride‐based systems. Further, the mechanistic insights on hydrogel salt interactions can guide the design of sustainable and low‐cost sorbent materials for future applications in water and energy.

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Benefits of metal–organic frameworks sorbents for sorbent wheels used in air conditioning systems

Cited by 9 publications

References 98 publications

Review on Polymer Materials for Solid Desiccant Cooling System

Review on Polymer Materials for Solid Desiccant Cooling System

Metal-Organic Framework Adsorbent Materials in HVAC Systems: General Survey and Theoretical Assessment

Sustainable, Low‐Cost Sorbents Based on Calcium Chloride‐Loaded Polyacrylamide Hydrogels

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