Ideal Adsorption Isotherm Behavior for Cooling Applications

Langmuir : the ACS Journal of Surfaces and Colloids
Morteza H Bagheri, Scott N Schiffres

Abstract

Purely heat-driven refrigeration has the potential for high primary-energy efficiency, especially when powered by waste heat or solar thermal sources. This paper presents a novel expression for the ideal adsorption step location as a function of operating conditions. This methodology is then applied to a hypothetical stepwise material to evaluate its intrinsic efficiency. This analysis technique is then extended to allow facile efficiency comparisons for any adsorbent-refrigerant pair using an adsorbent's isotherm and heat of adsorption properties. This work focuses on limitations to efficiency due to the equilibrium thermodynamics. It is found that a stepwise adsorbent can have a single-effect intrinsic efficiency of as high as about 85% of Carnot, assuming typical adsorbent specific heats and uptake capacity. Using these tools, we analyze the maximum ratio of cooling to heat input (coefficient of performance) for two adsorption pairs, zeolite 13X-water and UiO-66-water, which are found to have maximum coefficients of performance of 0.52 and 0.88 for a cold-side temperature of 10 °C and an ambient temperature of 30 °C, respectively. Meanwhile, the maximum fraction of Carnot cooling is 37% for zeolite 13X-water and 67% for UiO-...Continue Reading

References

Feb 12, 2009·Journal of the American Chemical Society·Stefan K HenningerChristoph Janiak
Jul 3, 2010·Science·Hiroyasu FurukawaOmar M Yaghi
Apr 6, 2012·Journal of the American Chemical Society·Thomas M McDonaldJeffrey R Long
Oct 13, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Gregory E CmarikKrista S Walton
Jul 19, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Felix JeremiasChristoph Janiak
Nov 7, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Azhar Bin IsmailWongee Chun
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Mar 13, 2015·Nature·Thomas M McDonaldJeffrey R Long
Nov 3, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Martijn F de LangeFreek Kapteijn

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