Functionalization on Metal–Organic Frameworks to Enhance Water Adsorption Uptakes and Kinetics for Cooling Applications: Fid-Bau Portal

Functionalization on Metal–Organic Frameworks to Enhance Water Adsorption Uptakes and Kinetics for Cooling Applications

Saha, Bidyut Baran / Rakshit, Dibakar / Han, Bo / Chakraborty, Anutosh

The research on adsorption‐based cooling systems has a long tradition as they are environmentally friendly and run by low‐grade waste heat sources generating from a geothermal source, onsite heating, cogeneration plants, or sunlight. The use of adsorption chiller is obstructed by bulky adsorption‐bed sizes including poor performances of solid adsorbents. Therefore, it is necessary to develop novel porous materials that capture more adsorbates with fast transfer rates. This chapter begins with the fabrication and functionalization of UiO‐66 (Zr) and MIL‐125 (Ti) metal–organic frameworks (MOFs). The porous structures and properties of these synthesized MOFs are measured by XRD (X‐ray diffraction), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and N ₂ adsorption analysis. Later, the amount of water uptakes on MOFs is measured under static and dynamic conditions. Employing experimentally confirmed isotherm, kinetic, and isosteric heat data, the performance parameters such as cooling capacity, thermal energy storage (TES), and coefficient of performance (COP) of an advanced adsorption chiller are predicted. The functionalization techniques modify both hydrophilicity and hydrophobicity of the parent MOFs, which can be transformed into various adsorption‐based applications. Hence, the functionalized UiO‐66 (Zr) and MIL‐125 (Ti) MOFs improve water transfer per adsorption/desorption cycle. The chiller designed with functionalized MOFs provides relatively higher specific cooling power (SCP) and the COP. Furthermore, the modified MOFs exhibit higher thermal energy storage density (TESD) up to 1.06 MJ/L.