Abstract
Aiming at the poor heat conduction performance of porous MIL-101 applied in adsorption cooling process, few layer graphene (FLG) was selected as a promising thermal conductive additive to enhance thermal conductivity of MIL-101. The factors which influencing thermal conductivity of MIL-101/FLG composites were investigated. Thermal conductive mechanism of FLG for MIL-101 was discussed. Adsorption/desorption characteristics of water on the MIL-101/FLG composites were determined. Results show a two-dimensional structure of FLG with no defects and high degree of order is beneficial to the improvement of thermal conductivity for MIL-101/FLG composites. At 30 °C and bulk density of 0.55 g/cm3, thermal conductivity of MIL-101/20%FLG and MIL-101/25%FLG composite is 6.5 and 11.3 times higher than that of MIL-101. Thermal conductivity of MIL-101/FLG composites is related to the alignment direction of FLG and test direction of heat flow, and the interfacial thermal resistance between MIL-101 and FLG. Adding FLG in the MIL-101/FLG composites does not affect adsorption/desorption mechanism of water on the MIL-101. The addition of FLG can strengthen mass transfer and thermal diffusion process on the surface of MIL-101. Adsorption rate constant of water on the MIL-101/25%FLG composite is 2.05 times higher than that of MIL-101. The desorption temperatures and desorption activation energies of water on MIL-101/20%FLG and MIL-101/25%FLG composites are lower than those of MIL-101. It can provide basic research for the development of new adsorption water chiller working pair (MIL-101/FLG–water) with high efficiency.
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Abbreviations
- SCP:
-
Specific cooling power (W/kg)
- COP:
-
Coefficient of performance
- λ:
-
Thermal conductivity (W/(m K))
- P0 :
-
Total heat output from the sensor (J)
- τ:
-
Characterized time ratio
- D (τ):
-
Dimension-less time-dependent function equation
- ∆Tave (τ):
-
Temperature rise of probe (K)
- r:
-
Radius of sensor (mm)
- t:
-
Time measured from the start of the transient recording (s)
- θ:
-
Characterized testing time (s)
- wt:
-
Mass fraction (%)
- v:
-
Volume fraction (%)
- p:
-
Vapor pressure (Pa)
- p0 :
-
Saturated vapor pressure (Pa)
- q:
-
Equilibrium adsorption uptake of water (g/gads)
- q0 :
-
Maximum adsorption uptake of water (g/gads)
- ε:
-
Adsorption potential (J/mol)
- E:
-
Characteristic parameters of a specific adsorbate-adsorbent system
- n:
-
Characteristic parameters of a specific adsorbate-adsorbent system
- T:
-
Adsorption temperature (K)
- Q:
-
Isosteric heat of adsorption (J/mol)
- C:
-
Model parameter
- F:
-
Coverage degree
- w:
-
Instantaneous adsorption uptake (g/gads)
- W:
-
Equilibrium adsorption uptake (g/gads)
- k:
-
Adsorption rate constant (min−1)
- t:
-
Adsorption time (min)
- Ed :
-
Desorption activation energy (kJ/mol)
- Tm :
-
Desorption peak temperature (K)
- φ:
-
Heating rate (K/min)
- R:
-
Gas constant (8.314 J/(mol K)
- max:
-
Maximum
- min:
-
Minimum
- s:
-
Saturated
- ads:
-
Adsorbent
- in:
-
Initial
- d:
-
Desorption
- m:
-
Middle
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Acknowledgements
This work was supported by the Project of the National Natural Science Foundation of China under contract No. 51476074 and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD). We also acknowledge comments from the reviewers that help us to improve the content of this paper.
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Yin, Y., Shao, J., Zhang, L. et al. Study on heat conduction and adsorption/desorption characteristic of MIL-101/few layer graphene composite. J Porous Mater 28, 1197–1213 (2021). https://doi.org/10.1007/s10934-021-01074-4
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DOI: https://doi.org/10.1007/s10934-021-01074-4