Research

Low-cost Thermal Energy Storage using Desalination Waste Salt

In this federally-sponsored project, we develop a patent-pending thermal energy storage system that repurposes desalination waste salt as a low-cost thermal energy storage  medium for different applications such as solar and geothermal desalination, and grid-scale energy storage. 

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A detailed techno-economic model is developed to show feasibility of offsetting the cost of thermal energy storage with desalination waste salt disposal cost while reducing the cost of concentrate disposal for desalination plants.   

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Using a variety of experimental and computational methods, the feasibility, effectiveness, and robustness of using desalination waste salt as a thermal energy storage medium is investigated in laboratory-scale at Cal Poly Pomona.

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Thermal characteristics of the desalination waste salt was investigated using analytical and experimental methods. Availability of phase change provide increased energy storage density in some water chemsitries. 

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Laboratory-scale demonstration of a thermal energy storage system using repurposed  concentrate salt at Cal Poly Pomona.  

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Simulation of solid to liquid phase change and buoyonacy-driven flows in charge (left) and discharge (right) cycles of a thermal energy storage modules that utilize repurposed concentrate salt as thermal energy storage medium shows effective charge and discharge times. 

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In this effort, a decentralized grid-independent, zero-carbon-footprint water treatment system is developed. The system utilizes a micro-filtration pre-treatment, a two-stage reverse osmosis, and an ultraviolet disinfection post-treatment. The system is solely powered by solar-photovoltaic panels through a battery bank. The developed system is capable of desalinating and disinfecting a permeate flow rate of 1.2-1.8 gpm with a recovery rate of 60-80%.  A minimum salt rejection rate of 97.5% is achieved at 140 psi of feed water pressure. For more information, please visit our website at www.drowt.org  

Waste Heat Recovery with Air-Gap Membrane Distillation

In this project, a pilot-scale Air-Gap Membrane Distillation (AGMD) Unit is integrated with a waste heat source to increase the overall efficiency and generate zero carbon foot-print distilled water. The team previously presented the AGMD system in lab-scale.

Sponsor/Partner: Sterlitech Inc.

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Cal Poly Pomona's Pilot-scale Air-Gap Membrane Distillation (AGMD) system using different  turbulence-causing  internal ribs.

Electrohydrodynamics (EHD) and Ion-driven Flows

In this project, the effect of corona discharge and ion-drag flows on enhancement of convective heat transfer and pumping efficiency is investigated computationally and experimentally.

Corona discharge in longitudinal channels for heat transfer enhancement

CFD analysis of secondary flows induced by corona discharge in rectangular mini channels