Versatile siloxane based adsorbent coatings for fast water adsorption processes in thermally driven chillers and heat pumps. (25th June 2015)

• Record Type: Journal Article
• Authors: Kummer, Harry; Füldner, Gerrit; Henninger, Stefan K.
• Is Part Of: Applied thermal engineering. Volume 85(2015:Jun.)
• Page Start: 1
• Page End: 8
• Publication Date: 2015-06-25
• Subjects: Zeolite -- SAPO-34 -- Adsorbent coating -- Adsorption heat pump -- Adsorption chiller -- Dehumidification; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2015.03.042
• Languages: English
• ISSNs: 1359-4311

Abstract

Abstract: In this work a versatile and hydrothermally stable binder based coating with fast adsorption kinetics for the use in thermally driven adsorption chillers, heat pumps and within dehumidification processes is reported. Two different adsorbents, a SAPO-34 with a typical adsorption isotherm favorable for low desorption temperatures and a zeolite Y for higher desorption temperatures were used. The coatings were prepared out of an aqueous dispersion for different binder contents with a minimum of 2.5 wt%. The performance of the coating and the influence of the binder on the equilibrium and dynamic adsorption characteristics were evaluated by means of thermogravimetry and a volumetric pressure jump method. Finally the hydrothermal stability under typical application boundary conditions was evaluated with surprisingly fair stability even for a very low binder content of a 2.5 wt%. Highlights: We report a versatile silicone based coating procedure. Various samples with coating thickness between 130 and 290 μm were achieved. We measured very fast rise up times between 24 s and 29 s. The hydrothermal stability has been proven over 3000 cycles. The coating procedure is inexpensive and environmental benign.