Adsorptive conversion of ultralow-temperature heat: Thermodynamic issues

Aristov, Yu. I.

doi:10.1016/j.energy.2021.121892

Cited by 13 publications

(7 citation statements)

References 32 publications

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“…Adsorption heat transformer has the unrivaled capability of transforming (shifting or amplifying) heat across the temperature scales. Adsorption heat transformation processes are especially suited for converting heat at a temperature only few degrees above ambient (ultralow grade heat) into cooling (adsorption chillers), showing in some instances encouraging second-law efficiencies >0.9, [1][2][3] while consuming the modest amounts of electricity. The distinctive feature of usefully converting heat usually meant useless, makes adsorption chillers a key technology for the decarbonization of those sectors where the emission of low-grade heat or the generation of low-temperature renewable heat is colocated with the need for cooling.…”

Section: Introductionmentioning

confidence: 99%

“…Although they share numerous characteristics, adsorption and absorption cooling technologies convert heat from sources in distinct temperature ranges, with adsorption being the only cooling process able to generate a cooling effect when T hot < 70 °C. [3,10,11] Figure 1 reports a comparison on the specific price (€ per kW of cooling) and on volumetric power density (kW of cooling per m 3 installed). Although small, the gap between the technologies is visible, with adsorption chillers having currently lower energy density and higher price than absorption chillers.…”

Section: Introductionmentioning

confidence: 99%

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Plastic 3D Printing in Adsorption Cooling: A Proof‐of‐Principle Module

AL‐Hasni,

Santori

2023

Energy Tech

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Plastic 3D printing allows the replacement of metal parts in a water/silica gel adsorption heat transformer module and its rapid manufacturing at low cost. This research investigates a simple design using three finned metal heat exchangers (HEXs) enclosed in one plastic 3D‐printed vessel. The dynamics of a conventional packed bed adsorber of Siogel silica gel grains with thermal response method is first identified to establish a benchmark case and allow to focus only on the challenges introduced by plastic 3D printing. Final testing of the device across a range of operating conditions and cycle times representative of cooling, desalination, and intermediate shows the adsorber follows an unconventional thermodynamic cycle. Generation of larger powers is achievable by coupling multiple small modules.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Plastic 3D Printing in Adsorption Cooling: A Proof‐of‐Principle Module

AL‐Hasni,

Santori

2023

Energy Tech

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“…The effective utilization of thermal energy from lowtemperature resources like solar energy, waste heat from biomass combustion, industry and household waste fulfils many domestic and industrial needs such as ice-making, vaccine safety, storage of milk, fruits, vegetables, food, space cooling as well as air conditioning [3][4][5][6][7][8][9][10]. Since the heavy use of airconditioning systems in hot weather demands high amount of electricity, heat-operated cooling systems like adsorption refrigeration system (ARS) could be an effective choice to produce cooling effect using low grade thermal energy available at temperatures less than 100 o C to reduce the dependency on conventional electrical power.…”

Section: Introductionmentioning

confidence: 99%

Comparative Studies on Solar Assisted Silica Gel- Water and Activated Carbon-Methanol Based Adsorption Refrigeration System

K¹,

Kapilan²,

Kasthurirengan

2022

jmmf

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The ever increasing cooling demand and the environmental concern have made in search of alternative refrigeration and for the last few decades, the energy efficient cooling systems utilizing refrigerants of no negative impact on the environment are explored. In this view, heat-driven refrigeration systems like vapour adsorption refrigeration is one of the favourable alternatives. Though adsorption cooling devices are capable of producing desirable cooling effect with a relatively low heat source temperature, their coefficient of performance (COP) is low in comparison with the existing cooling technologies. Therefore, to solve the environmental, economic and technical issues, the research is still in progress in this area. It is evident from the literature that, the performance of adsorption refrigeration depends on selecting the working pair such as silica gel-water, activated carbon-ammonia, zeolite-water etc. and driving temperature. This paper presents the comparison of performances of solar assisted twin bed adsorption refrigeration which employs silica gel-water and activated carbon-methanol as working pairs. Results are found to be good with continuous cooling in the evaporator using low temperature source of heat and the lowest temperature achieved in the evaporator for silica gel-water is 11°C and for activated Carbon-Methanol is 2°C. The coefficient of performance obtained is higher for silica gel based system than that of Activated carbon based system.

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“…For transforming heat, the literature has recently discussed thermally driven heat transformers based on thermochemical reactions [ 9 ] or absorption [ 10 ] and adsorption [ 11,12 ] phenomena. A comparison of these heat transformers was performed in our previous article.…”

Section: Introductionmentioning

confidence: 99%

“…Closed-loop cycles have been studied mainly for the utilization of ambient heat at temperatures around 0 °C to generate useful heat at domestically relevant temperatures such as 30-40 °C. [12,23] Aristov and co-workers have comprehensively studied the optimal working pair both theoretically and experimentally to increase useful heat generation and, thus, the cycle performance. [24] Important progress has been made, e.g., the theoretical derivation showing that the optimal working pair requires a convex/concave sorption isotherm for adsorption/desorption [25] or the experimental demonstration of pressure-initiated desorption at very low vapor pressures.…”

Section: Introductionmentioning

confidence: 99%

Closed‐Loop Adsorption‐Based Upgrading of Heat from 90 to 110 °C: Experimental Demonstration and Insights for Future Development

et al. 2022

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Industrial energy efficiency can be increased by recovering waste heat, mainly available below 100 °C. This low‐temperature waste heat can drive adsorption heat transformers (AdHTs) to upgrade waste heat to industrially relevant temperatures above 100 °C. Flexible process integration can be achieved by decoupling adsorptive and heat transfer fluid in closed‐loop cycles. However, the experimental feasibility of closed‐loop AdHTs has not been shown yet. Hence, this work studies an experimental one‐bed setup of an AdHT based on a closed‐loop cycle using silica gel 123 and water as the working pair. Experimental feasibility is demonstrated for heat transformation from 90 to 110 °C with waste heat released at 25 °C. The highest coefficient of performance (COP) is 0.183 J J−1 (23% of the maximum Carnot efficiency), and the highest specific heating power (SHP) is 168 W kg−1. A systematic variation of the operating conditions shows that efficiency COP and power density SHP strongly depend on the operating temperatures, volume flows, and phase times. Furthermore, avoiding condensation inside the adsorber casing and heat losses are identified to be crucial for the design of AdHTs. In summary, AdHTs based on a closed‐loop cycle show a promising performance to recover low‐temperature waste heat.

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Adsorptive conversion of ultralow-temperature heat: Thermodynamic issues

Cited by 13 publications

References 32 publications

Plastic 3D Printing in Adsorption Cooling: A Proof‐of‐Principle Module

Plastic 3D Printing in Adsorption Cooling: A Proof‐of‐Principle Module

Comparative Studies on Solar Assisted Silica Gel- Water and Activated Carbon-Methanol Based Adsorption Refrigeration System

Closed‐Loop Adsorption‐Based Upgrading of Heat from 90 to 110 °C: Experimental Demonstration and Insights for Future Development

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