Abstract
Metal-organic frameworks (MOFs) are a class of porous coordination polymers constructed from co-ordinately binding metals and organic linkers. Aluminium fumarate, a microporous MOF composed of aluminium and fumaric acid, has a high affinity toward water vapor adsorption. The adsorption process in such porous materials could be featured for cooling by harnessing thermal energy, reducing the need for an energy-intensive vapor compression refrigeration system. The thermodynamic property field analysis is crucial for calculating the adsorption cooling system’s energetic performance. In this work, the thermodynamic property fields of pristine aluminium fumarate and nickel and cobalt-doped aluminium fumarates were analyzed, and the results were compared from the viewpoint of adsorption cooling application. The water adsorption isotherms on these samples were correlated with the Sun and Chakraborty and the Universal models. Thermodynamic properties, isosteric heat of adsorption, and specific heat capacity of the MOF/water pairs were investigated, and results were analyzed with respect to the adsorbate uptake. The performance parameters, specific cooling effect, and coefficient of performance were studied and compared for the samples. Nickle and cobalt-doped aluminium fumarates have presented a higher specific cooling effect than the pristine MOF. This analysis provides crucial findings contributing to design practical MOF/water-based adsorption cooling systems.
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Abbreviations
- COP :
-
Coefficient of performance [–]
- c p,a :
-
Specific heat capacity of the adsorbed phase [kJ kg−1 K−1]
- c p,ads :
-
Specific heat capacity of the solid adsorbent [kJ kg−1 K−1]
- c p,g :
-
Specific heat capacity of the gas [kJ kg−1 K−1]
- c p,s :
-
Specific heat capacity of the system [kJ kg−1 K−1]
- h a :
-
Adsorbed phase enthalpy [kJ kg−1]
- h f :
-
Liquid enthalpy [kJ kg−1]
- h fg :
-
Enthalpy of evaporation [kJ kg−1]
- m :
-
Surface heterogeneity factor [–]
- P :
-
Equilibrium pressure [kPa]
- P s :
-
Saturated pressure [kPa]
- q :
-
Instantaneous adsorption uptake [g g−1]
- q 0 :
-
Equilibrium adsorption uptake [g g−1]
- Q st * :
-
Isosteric heat of adsorption at zero uptake [J g−1]
- Q st :
-
Isosteric heat of adsorption [J g−1]
- R :
-
Universal gas constant [J g−1 K−1]
- SCE :
-
Specific cooling effect [kJ kg−1]
- T :
-
Adsorption temperature [K]
- cond :
-
Condenser
- evap :
-
Evaporator
- e des :
-
End of desorption
- e ads :
-
End of adsorption
- max :
-
Maximum
- min :
-
Minimum
- s des :
-
Start of desorption
- s ads :
-
Start of adsorption
- α :
-
Pre-exponential coefficient [–]
- α i :
-
Fractional probability factor [–]
- ε 0 :
-
Energy of the adsorption site [J mol−1]
- υ g :
-
Specific volume of gas [m3 kg−1
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Jahan, I., Rupam, T.H., Palash, M.L. et al. Thermodynamic analysis of promising MOF/water pairs for adsorption cooling systems. Sādhanā 48, 170 (2023). https://doi.org/10.1007/s12046-023-02218-9
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DOI: https://doi.org/10.1007/s12046-023-02218-9