Thermodynamic limits of atmospheric water harvesting with temperature-dependent adsorption
Abstract
Adsorption-based atmospheric water harvesting (AWH) has vast potential for addressing global water shortage. Despite innovations in adsorbent materials, fundamental understanding of the physical processes involved in the AWH cycle and how material properties impact the theoretical limits of AWH is lacking. Here, we develop a generalized thermodynamic framework to elucidate the interplay between adsorbent properties and operating conditions for optimal AWH performance. Our analysis considers the temperature dependence of adsorption, which is critical but has largely been overlooked in past work. Using metal-organic framework (MOF) as an example, we show that the peak energy efficiencies of single-stage and dual-stage AWH devices, after considering temperature-dependent adsorption, increased by 30% and 100%, respectively, compared with previous studies. Moreover, in contrast to common understanding, we show that the adsorption enthalpy of MOFs can also be optimized to further improve the peak energy efficiency by 40%. This work bridges an important knowledge gap between adsorbent materials development and device design, providing insight toward high-performance adsorption-based AWH technologies.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 17, 2022
- Source ID
- 10.1063/5.0118094
Entities
People
- Adela Chenyang Li
- Bachir El Fil
- Evelyn Wang
- Krista S. Walton
- Lenan Zhang
- Pasquale F Fulvio
- Xiangyu Li
- Yang Zhong
Organizations
- Defense Advanced Research Projects Agency
- Georgia Tech
- Massachusetts Institute of Technology