Adsorption characteristics and cooling/heating performance of COF-5. (25th July 2020)

• Record Type: Journal Article
• Authors: Xia, Xiaoxiao; Liu, Zhilu; Li, Song
• Is Part Of: Applied thermal engineering. Volume 176(2020)
• Publication Date: 2020-07-25
• Subjects: Heat pumps -- Covalent-organic frameworks -- Ethanol -- Coefficient of performance -- Temperature lift; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2020.115442
• Languages: English
• ISSNs: 1359-4311

Abstract

Highlights: COF-5 exhibit preferential stepwise adsorption isotherm for adsorption cooling. COF-5 displayed the higher COPC than CuBTC, MIL-101(Cr), and ZIF-8. The higher COP of COF-5 at a wider range of temperature lift is favorable especially at low desorption temperature. Abstract: Adsorption-driven heat pumps (AHPs) powered by low-grade waste heat and solar energy are promising to reduce the energy consumption for cooling and heating. Seeking novel high-performing adsorbents of AHPs is the key to improve their cooling/heating performance. Very recently, the potential use of covalent-organic frameworks (COFs) adsorbents of AHPs has won increasing research interests. However, the adsorption cooling/heating performance of COFs under varying working conditions is still unexplored. In this study, COF-5 was synthesized and tested to obtain the adsorption isotherms of ethanol working fluid. For comparison, three commonly used metal-organic frameworks (MOFs), including Cu-BTC, MIL-101(Cr), and ZIF-8, were also investigated. The cooling/heating performance of COF-5/ethanol and MOF/ethanol working pairs was evaluated by mathematical modelling based on the basic thermodynamic cycle of AHPs. The results demonstrated that COF-5 with the high coefficient of performance for cooling/heating (COPC /COPH ) under wide temperature lift (ΔTlift ) outperformed MOFs, especially for cooling.