Sustainability

Oral

393431 - Energy and Power Efficiency and Cost Comparison of Battery vs. End-use Water Storage for Consumption as Means of Solar PV Energy Storage

Monday, June 4
10:30 AM - 12:00 PM
Location: Northstar B

A reliable potable water system is a critical component of modern living. For homeowners with off-grid houses, providing reliable potable water also requires a reliable electricity supply to run the pump(s) and treatment system. Since water consumption occurs throughout the day and night, a solar-powered off-grid system must contain some sort of energy storage to power the water system when the sun is not shining. The goal of this analysis is to evaluate the trade-offs of battery storage with the ‘end-use storage’ of pressurized treated water.

For this project, we built a simplified powered demand model of an off-grid residential rainwater harvesting system that featured onsite treatment and pressurized water delivery to the home. Using data from the 2016 Water Research Foundation study of Residential End Uses of Water, we created a program to generate hourly water usage profiles of typical household water use. The profiles serve as the templates for sizing the water delivery system based on how much treated water needs to be delivered during each hour for an average single family home. We then compared the power and energy requirements for treating and pressurizing the water using an in-line UV light treatment and on-demand pump, versus that of treating 24 hours’ worth of water using a solar powered UV light treatment and large pressurized tank for next day consumption. With our analysis, we will assess which system is more energy efficient on a round-trip basis, and the impact on power demand of treating and delivering water on-demand compared to that of stored pressurized water. This analysis will include an interactive online tool for others to compare system power and energy requirements based on their own water demand profile and other inputs.

Heather Rose

Undergraduate Research Assistant
University of Texas at Austin

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Charles Upshaw

Postdoctoral Researcher
University of Texas at Austin

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Michael Webber

Professor
University of Texas at Austin

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393431 - Energy and Power Efficiency and Cost Comparison of Battery vs. End-use Water Storage for Consumption as Means of Solar PV Energy Storage



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