The potential use of graphene to intensify the heat transfer in adsorption beds

Ahmed Rezk, Laura J Leslie, Rees Davenport

Research output: Contribution to conferencePaper

Abstract

Adsorption system for cooling, heat pumps, heat storing and water desalination have gained increasing attention in the last few decades. Adsorption systems have the advantage of utilising low-grade heat (below 200 °C), available by solar energy, wasted from industrial processes or other potential domestic waste heat sources. Granular packed adsorbent bed is the most used design in the commercially available adsorption equipment because of its high permeability, but nonetheless it has poor heat transfer performance. Many approaches were investigated to enhance the heat transfer performance of the adsorbent bed; blending the adsorbent granules with metal additives to enhance the overall thermal conductivity of the adsorbent bed, coating the adsorbent bed surface with thin layers of adsorbent to reduce the contact thermal resistance, adsorbent deposition over metallic foam and other consolidation approaches. Blending the adsorbent granules with metal additives has shown great potential to improve the heat transfer performance without reducing the adsorbent bed permeability.
Graphene is a single layer of carbon atoms which are arranged in hexagonal shape. A single layer of graphene exhibits thermal conductivity of up to 5300 W/mK. However, the thermal conductivity of graphene-based materials can be reduced by increasing the number of carbon atomic layers. Reduced graphene platelets of 30-45 layers showed thermal conductivity close to the bulk thermal conductivity of graphite. Graphite is a 3D structured graphene of relatively high bulk thermal conductivity (1950 W/mK) and is commonly used in adsorption equipment. Given the outstanding thermal performance of graphene-based materials, the hypothesis of this research is to blend the adsorbent granules with graphene-based materials of just a few carbon atomic layers to enhance the heat transfer performance of granular packed adsorbent beds.
Original languageEnglish
Publication statusAccepted/In press - 8 Sep 2019
EventProceedings of the 16th UK Heat Transfer Conference (UKHTC2019) - University of Nottingham, Nottingham, United Kingdom
Duration: 8 Sep 201910 Sep 2019
https://www.nottingham.ac.uk/conference/fac-eng/ukhtc2019/

Conference

ConferenceProceedings of the 16th UK Heat Transfer Conference (UKHTC2019)
Abbreviated titleUKHTC
CountryUnited Kingdom
CityNottingham
Period8/09/1910/09/19
Internet address

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Adsorbents
Graphene
Heat transfer
Adsorption
Thermal conductivity
Carbon
Graphite
Waste heat
Desalination
Platelets
Metals
Heat resistance
Consolidation
Solar energy
Foams
Pumps
Cooling
Coatings
Atoms
Hot Temperature

Cite this

Rezk, A., Leslie, L. J., & Davenport, R. (Accepted/In press). The potential use of graphene to intensify the heat transfer in adsorption beds. Paper presented at Proceedings of the 16th UK Heat Transfer Conference (UKHTC2019), Nottingham, United Kingdom.
Rezk, Ahmed ; Leslie, Laura J ; Davenport, Rees. / The potential use of graphene to intensify the heat transfer in adsorption beds. Paper presented at Proceedings of the 16th UK Heat Transfer Conference (UKHTC2019), Nottingham, United Kingdom.
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Rezk, A, Leslie, LJ & Davenport, R 2019, 'The potential use of graphene to intensify the heat transfer in adsorption beds' Paper presented at Proceedings of the 16th UK Heat Transfer Conference (UKHTC2019), Nottingham, United Kingdom, 8/09/19 - 10/09/19, .

The potential use of graphene to intensify the heat transfer in adsorption beds. / Rezk, Ahmed; Leslie, Laura J; Davenport, Rees.

2019. Paper presented at Proceedings of the 16th UK Heat Transfer Conference (UKHTC2019), Nottingham, United Kingdom.

Research output: Contribution to conferencePaper

TY - CONF

T1 - The potential use of graphene to intensify the heat transfer in adsorption beds

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N2 - Adsorption system for cooling, heat pumps, heat storing and water desalination have gained increasing attention in the last few decades. Adsorption systems have the advantage of utilising low-grade heat (below 200 °C), available by solar energy, wasted from industrial processes or other potential domestic waste heat sources. Granular packed adsorbent bed is the most used design in the commercially available adsorption equipment because of its high permeability, but nonetheless it has poor heat transfer performance. Many approaches were investigated to enhance the heat transfer performance of the adsorbent bed; blending the adsorbent granules with metal additives to enhance the overall thermal conductivity of the adsorbent bed, coating the adsorbent bed surface with thin layers of adsorbent to reduce the contact thermal resistance, adsorbent deposition over metallic foam and other consolidation approaches. Blending the adsorbent granules with metal additives has shown great potential to improve the heat transfer performance without reducing the adsorbent bed permeability. Graphene is a single layer of carbon atoms which are arranged in hexagonal shape. A single layer of graphene exhibits thermal conductivity of up to 5300 W/mK. However, the thermal conductivity of graphene-based materials can be reduced by increasing the number of carbon atomic layers. Reduced graphene platelets of 30-45 layers showed thermal conductivity close to the bulk thermal conductivity of graphite. Graphite is a 3D structured graphene of relatively high bulk thermal conductivity (1950 W/mK) and is commonly used in adsorption equipment. Given the outstanding thermal performance of graphene-based materials, the hypothesis of this research is to blend the adsorbent granules with graphene-based materials of just a few carbon atomic layers to enhance the heat transfer performance of granular packed adsorbent beds.

AB - Adsorption system for cooling, heat pumps, heat storing and water desalination have gained increasing attention in the last few decades. Adsorption systems have the advantage of utilising low-grade heat (below 200 °C), available by solar energy, wasted from industrial processes or other potential domestic waste heat sources. Granular packed adsorbent bed is the most used design in the commercially available adsorption equipment because of its high permeability, but nonetheless it has poor heat transfer performance. Many approaches were investigated to enhance the heat transfer performance of the adsorbent bed; blending the adsorbent granules with metal additives to enhance the overall thermal conductivity of the adsorbent bed, coating the adsorbent bed surface with thin layers of adsorbent to reduce the contact thermal resistance, adsorbent deposition over metallic foam and other consolidation approaches. Blending the adsorbent granules with metal additives has shown great potential to improve the heat transfer performance without reducing the adsorbent bed permeability. Graphene is a single layer of carbon atoms which are arranged in hexagonal shape. A single layer of graphene exhibits thermal conductivity of up to 5300 W/mK. However, the thermal conductivity of graphene-based materials can be reduced by increasing the number of carbon atomic layers. Reduced graphene platelets of 30-45 layers showed thermal conductivity close to the bulk thermal conductivity of graphite. Graphite is a 3D structured graphene of relatively high bulk thermal conductivity (1950 W/mK) and is commonly used in adsorption equipment. Given the outstanding thermal performance of graphene-based materials, the hypothesis of this research is to blend the adsorbent granules with graphene-based materials of just a few carbon atomic layers to enhance the heat transfer performance of granular packed adsorbent beds.

M3 - Paper

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Rezk A, Leslie LJ, Davenport R. The potential use of graphene to intensify the heat transfer in adsorption beds. 2019. Paper presented at Proceedings of the 16th UK Heat Transfer Conference (UKHTC2019), Nottingham, United Kingdom.