Monday August 26, 2019 from 15:30 to 17:10
First results of a directly air-cooled fixed-bed adsorber for a refrigerator driven by waste heat
Kristian HURTIG1, Karsten DÜWEL1, Mike JÄGER1, Roland KÜHN1.
1Technische Universität Berlin, Institute of Energy Engineering, Berlin, Germany
In the paper at hand first results of testing a directly air-cooled adsorption refrigerator with fixed-bed adsorbers are presented.
The refrigerator utilizes water as refrigerant and silica gel as adsorbent. In contrast to the most common water-cooled adsorbers, the investigated adsorber is cooled with ambient air. The adsorber has a plate geometry with vertical fins. Low power fans are installed to increase the heat transfer. The configuration of the adsorber is introduced, followed by a discussion of its temperature distribution and an outlook on future improvements.
The results show that the adsorber’s surface temperature varies by up to 10 K over the height. The minimum temperature difference between surface and cooling air occurs at the inlet of the air flow. The temperature difference between inlet and outlet on the surface cannot be induced by the air’s temperature increase with flow length only, but is also influenced by the adsorption characteristics.