On the development of an innovative adsorber plate heat exchanger for adsorption heat transformation processes; an experimental and numerical study. (15th September 2020)

• Record Type: Journal Article
• Authors: Mikhaeil, Makram; Gaderer, Matthias; Dawoud, Belal
• Is Part Of: Energy. Volume 207(2020)
• Publication Date: 2020-09-15
• Subjects: Adsorber heat exchanger -- Plate heat exchanger -- Adsorption kinetics -- Dynamic simulation; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2020.118272
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: An innovative adsorber plate heat exchanger (APHE), which is developed for application in adsorption heat pumps, chillers and thermal energy storage systems, is introduced. A test frame has been constructed as a representative segment of the introduced APHE for applying loose grains of AQSOA-Z02. Adsorption kinetic measurements have been carried out in a volumetric large-temperature-jump setup under typical operating conditions of adsorption processes. A transient 2-D model is developed for the tested sample inside the setup. The measured temporal uptake variations with time have been fed to the model, through which a micro-pore diffusion coefficient at infinite temperature of 2 E−4 [m 2 s −1 ] and an activation energy of 42.1 [kJ mol −1 ] have been estimated. A 3-D model is developed to simulate the combined heat and mass transfer inside the APHE and implemented in a commercial software. Comparing the obtained results with the literature values for an extruded aluminium adsorber heat exchanger coated with a 500 μm layer of the same adsorbent, the differential water uptake obtained after 300 s of adsorption (8.2 g/100 g) implies a sound enhancement of 310%. This result proves the great potential of the introduced APHE to remarkably enhance the performance of adsorption heat transformation appliances. Highlights: An innovate stainless steel adsorber plate heat exchanger (APHE) is introduced. Representative APHE-segment is experimentally tested with AQSOA–Z02 loose grains. 2-D and 3-D Simulations carried out on the representative segment and the APHE. Diffusion coefficient at infinite temperature (D∞ ) and (Ea ) are obtained. Performance of the introduced APHE outreaches coated aluminium heat exchangers.