Honors College Thesis

 

Waste Heat Recovery Using Thermochemical Energy Storage Public Deposited

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https://ir.library.oregonstate.edu/concern/honors_college_theses/2v23w267p

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  • Industrial waste heat composed of saturated liquid water can be redirected to charge a thermochemical energy storage (TCES) system. This energy can be stored long-term in the inherently energy-dense chemical bonds and used for space heating. Initial reactor scale cycling experiments were conducted in tandem with TCES material improvements. Hydration tests with expanded graphite and magnesium nitrate in a benchscale reactor revealed more heat absorbed at higher carrier fluid flowrates. Magnesium nitrate in a high porous silicone foam complex was explored to improve the cyclability of the TCES material and vapor flow. Six different salt wt% were created to study the changes in morphology with increasing salt content. Pore size and frequency decreased as salt content increased, quantified through SEM imaging. Inversely, density increased with increasing salt content. However, initial ink trace testing reveals that large individual pores do not correspond to a well-connected internal pore structure and that the optimal internal pore structure exists at a higher density. Future work quantifying fluid and heat flow, pressure drop across salt-foam complexes, the addition of thermally conductive materials, and microtomography will be conducted to characterize salt-foam morphology and prepare this TCES for reactor scale testing.
  • Keywords: Salt hydrates, magnesium nitrate, thermochemical energy storage, benchscale reactor, direct heat exchanger, silicone foam morphology
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