SAPO-34 coated adsorbent heat exchanger for adsorption chillers

Freni, Angelo; Bonaccorsi, Lucio; Calabrese, Luigi; Caprì, Angela; Frazzica, Andrea; Aristov, Yu. I.

doi:10.1016/j.applthermaleng.2015.02.052

Cited by 199 publications

(86 citation statements)

References 18 publications

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“…The exothermic adsorption process of water and zeolite in combination with the saturation behavior caused by increasing temperature requires a cooling mass flow through the adsorption bed. Therefore valves V6 and V1 have to be open while valves V2 and V5 have to be closed.…”

Section: Adsorption Cooling Systemmentioning

confidence: 99%

“…Freni et al compare the adsorption kinetics of SAPO‐34 granulates and coatings. The effective diffusivities for SAPO‐34 and water were measured in the range of k eff (50 – 80 °C) = 1.7 · 10 −11 – 1.97 · 10 −10 m 2 s −1 .…”

Section: Simulation Reviewmentioning

confidence: 99%

“…Therefore, alternative solutions to current cooling systems are necessary. A promising new method in the field of air conditioning is the use of adsorption processes powered by low temperature thermal sources . Advantages include use of low grade heat sources, natural refrigerants such as water, less moving mechanical parts, low noise level, and low maintenance .…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, much research is conducted to improve the efficiency of thermal powered adsorption refrigeration processes. Significant progress was made, which has led to many new adsorbent types and complex adsorber geometries to improve the heat and mass transfer within the system , . However, there is still room for optimizing the efficiency .…”

Section: Introductionmentioning

confidence: 99%

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Modeling of Water Adsorption in SAPO‐34‐Coated Aluminum Foam

Brückner

Demmer

Ganswind

et al. 2017

Chemie Ingenieur Technik

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After presenting the most promising continuous adsorption cooling topology for air‐conditioning of a passenger cabin, a transient, 3D model is proposed, based on a modified linear driving force approach, to simulate an adsorption process in a SAPO‐34‐coated open‐celled aluminum foam. The simulation is executed in ANSYS CFX 15.0 and the additional model equations are implemented through the CFX expression language. As a result the influence of the pore diameter onto the system simulation and the mass transport limitation is shown and the sensitivity concerning the pressure in the gas phase adsorption is confirmed.

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Section: Adsorption Cooling Systemmentioning

confidence: 99%

Section: Simulation Reviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modeling of Water Adsorption in SAPO‐34‐Coated Aluminum Foam

Brückner

Demmer

Ganswind

et al. 2017

Chemie Ingenieur Technik

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“…In fact, similar concepts of adsorption heat exchangers have been studied by several researchers1317181920, but most were designed to dehumidify the air or to be used for adsorption refrigeration that focused on the mass-exchange process. To achieve the above-mentioned goals, four problems need to be solved: (1) novel desiccants that have an adequate moisture uptake capacity difference under two-cycle conditions should be invented; (2) sensible heat transfer should not be obviously weakened by the desiccant coated layer; (3) a matched control strategy with a DDX HP to achieve high efficiency at any mix of sensible and latent loads should be developed; and (4) the loss of sensible-load capacity due to operational mode switching should be minimized.…”

mentioning

confidence: 99%

Comfortable, high-efficiency heat pump with desiccant-coated, water-sorbing heat exchangers

Wang

et al. 2017

Sci Rep

107

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Comfortable, efficient, and affordable heating, ventilation, and air conditioning systems in buildings are highly desirable due to the demands of energy efficiency and environmental friendliness. Traditional vapor-compression air conditioners exhibit a lower coefficient of performance (COP) (typically 2.8–3.8) owing to the cooling-based dehumidification methods that handle both sensible and latent loads together. Temperature- and humidity-independent control or desiccant systems have been proposed to overcome these challenges; however, the COP of current desiccant systems is quite small and additional heat sources are usually needed. Here, we report on a desiccant-enhanced, direct expansion heat pump based on a water-sorbing heat exchanger with a desiccant coating that exhibits an ultrahigh COP value of more than 7 without sacrificing any comfort or compactness. The pump’s efficiency is doubled compared to that of pumps currently used in conventional room air conditioners, which is a revolutionary HVAC breakthrough. Our proposed water-sorbing heat exchanger can independently handle sensible and latent loads at the same time. The desiccants adsorb moisture almost isothermally and can be regenerated by condensation heat. This new approach opens up the possibility of achieving ultrahigh efficiency for a broad range of temperature- and humidity-control applications.

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Air Conditioning Systems: Cooling and Dehumidification

Chua

Bui

Kumja

et al. 2017

Kirk-Othmer Encyclopedia of Chemical Technology

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Air conditioning is essential for maintaining thermal comfort in indoor environments. In tropical climates, the energy consumed due to heating, ventilation, and air‐conditioning ( HVAC ) can exceed 50% of the total energy consumption of a building. Therefore, there is tremendous potential to improve the efficiency of air‐conditioning systems for building applications. This article focuses on recent developments in air‐conditioning systems, particularly innovative technologies in cooling and dehumidification including adsorption cooling and dew point evaporative cooling and new generations of solid‐based desiccant dehumidifiers, liquid‐based desiccants and novel membranes that are able to sieve water vapor when a trans membrane pressure is applied. The principles behind these technologies and recent progresses in terms of performance testing and improved efficiency are discussed.

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SAPO-34 coated adsorbent heat exchanger for adsorption chillers

Cited by 199 publications

References 18 publications

Modeling of Water Adsorption in SAPO‐34‐Coated Aluminum Foam

Modeling of Water Adsorption in SAPO‐34‐Coated Aluminum Foam

Comfortable, high-efficiency heat pump with desiccant-coated, water-sorbing heat exchangers

Air Conditioning Systems: Cooling and Dehumidification

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