Adsorption characteristics of methyl-functional ligand MOF-801 and water systems: adsorption chiller modelling and performances

Abstract

The use of environmentally friendly adsorption assisted thermal storage and chiller is hindered by their bulky sizes and poor performances, which are mainly due to the limited characteristics of solid adsorbents and their poor interactions with water. Therefore, this article presents the parent and CH3 ligand MOF-801 (Zr) adsorbents and their synthesization procedures with surface characterization. Later, the water uptakes on these two MOFs are measured under dynamic and equilibrium conditions for the temperatures of 25–80 °C. Employing experimentally confirmed water uptake and kinetics data of MOFs + water systems, the energetic performances of an adsorption chiller are calculated in terms of the specific cooling power (SCP) and the coefficient of performance (COP). Hence, the methyl functional group enhances the thermal stability of the parent MOF-801 structures with water uptake/offtake rates i.e. kinetics. Under chiller operating conditions, the SCP and the COP of CH3 ligand MOF-801 (Zr) are found 40% and 30% higher as compared with the parent MOF-801(Zr). Methyl-functional ligand in MOF-801 (Zr) shows promising results for cooling application.