4.7 Article

Computational investigation of the hexagonal honeycomb adsorption reactor for cooling applications

Journal

APPLIED THERMAL ENGINEERING
Volume 202, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2021.117807

Keywords

Adsorption cooling; Adsorption packed bed reactor; Numerical simulation; Hexagonal honeycomb reactor

Funding

  1. Spanish Ministry of Economy, Industry and Competitiveness (MINECO) [ENE2017-88697R]
  2. Catalan Government

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This study investigates the hexagonal honeycomb adsorption reactor design in adsorption cooling technology, examining the effects of various geometric and operational parameters on Specific Cooling Power (SCP) and Coefficient of Performance (COP). The results indicate that factors such as cell inradius, height, and fin thickness have a significant impact on system performance.
Adsorption cooling is a sustainable technology, since it can utilize solar energy or waste heat, while employing substances without ozone depletion and global warming potential. The adsorption reactor design is determinant for the system performance. An underexplored geometry hitherto - the hexagonal honeycomb adsorption reactor - was numerically investigated. An in-house, validated, three-dimensional computational model based on unstructured meshes was employed. The Specific Cooling Power (SCP) and Coefficient of Performance (COP) were quantified for several geometrical and operational parameters. The cell inradius creates a dichotomy between SCP and COP, being 218.9 W/kg(s) and 0.356 for 1 mm, while being 80.4 W/kg(s) and 0.606 for 6 mm. The cell height influences prominently the SCP, being 159.5 W/kg(s) and 86.1 W/kg(s) for 5 mm and 30mm, respectively. The fin thickness impacts mostly the COP, being 0.599 and 0.364 for 0.5 mm and 3 mm, respectively. Higher COP is achieved for higher evaporator, lower adsorption and lower condenser temperatures. Higher SCP is achieved for lower adsorption and condenser, and higher evaporator and desorption temperatures. Shorter cycles result in high SCP and low COP, whereas the inverse occurs for longer cycles. Aluminum heat exchanger yields 7.7% higher COP than copper. The results are discussed from a physical, as well as, an engineering perspective.

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