Closed-Loop Adsorption-Based Upgrading of Heat from 90 to 110 °C: Experimental Demonstration and Insights for Future Development

Autor: Engelpracht, Mirko, Driesel, Jannik, Nießen, Oliver, Henninger, Matthias Roland Wolfgang, Seiler, Jan, Bardow, André
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Energy technology 10(7), 2200251 (2022). doi:10.1002/ente.202200251
Energy Technology, 10 (7)
ISSN: 2194-4296
2194-4288
Popis: Industrial energy efficiency can be increased by recovering waste heat, mainly available below 100 °C. This low-temperature waste heat can drive Adsorption Heat Transformers (AdHTs) to upgrade waste heat to industrially relevant temperatures above 100 °C. Flexible process integration can be achieved by decoupling adsorptive and heat transfer fluid in closed-loop cycles. However, the experimental feasibility of closed-loop AdHTs has not been shown yet. Hence, this work studies an experimental one-bed setup of an AdHT based on a closed-loop cycle using silica gel 123 & water as the working pair. Experimental feasibility is demonstrated for heat transformation from 90 to 110 °C with waste heat released at 25 °C. The highest efficiency COP is 0.183 J J-1 (23% of the maximum Carnot efficiency), and the highest power density SHP is 168 W kg-1. A systematic variation of the operating conditions shows that efficiency and power density strongly depend on the operating temperatures, volume flows, and phase times. Furthermore, avoiding condensation inside the adsorber casing and heat losses are identified to be crucial for the design of AdHTs. In summary, AdHTs based on a closed-loop cycle show a promising performance to recover low-temperature waste heat.
Energy Technology, 10 (7)
ISSN:2194-4296
ISSN:2194-4288
Databáze: OpenAIRE
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