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Demonstration Potential: 4 – 5 The demonstration potential for this technology was ranked high based the need to prove that it can work in multiple climates to ensure its adoption into standardized roof replacement specifications for DOD. Opportunity #9 – Low-Cost Solar Water Heaters for Mild Climates Solar water heating is a relatively mature technology that can meet significant load in housing and some commercial buildings. However, conventional technology uses relatively expensive metal and glass technology, and the systems do not have good payback against natural gas, even with the existing federal, state, and/or utility incentives. With single-family system pre-rebate cost in the $5,000 -$12,000 range and savings on order of $100/year against natural gas backup, simple paybacks can be more than 70 years. It is thus of interest that two new low-cost solar water heating systems for mild climates have been introduced to the U.S. market that can be installed at pre-rebate costs under $2,000. The collectors and piping in both systems are low-cost polymeric materials, with hardware cost reductions of order 50%–80% depending on the distribution and marketing channels used. In both low-cost systems, unit-area performance is lower than the best active systems, depending on the solar fraction. The lower performance stems from design compromises to limit overheating of the polymeric materials, being unglazed in one case and un-insulated in the other. At high solar fractions, unit-area performance is down about 40%, which can be compensated for by increasing the area of the low-cost collectors. At low solar fractions, the performance is comparable to the best systems. Given that EISA 2007 requires federal facilities to meet 30% of their hot water demand with solar energy, at these low solar fractions the low-cost systems are a new opportunity for cost-effectively lowering water heating costs as required. Applicable DOD Market: All federal housing facilities and commercial DOD buildings with significant water heating loads, such as hospitals, recreation centers, and washing facilities. Particularly attractive are any facilities with electric heat. Energy Savings Potential: Across the federal sector, water heating costs were around $650 million in 2009. The low- cost systems will typically meet 30% – 80% of the water heating load, depending on context and load. Potential Commercialization Date: Currently available in the U.S. market. Contact information: Jay Burch, 303-384-7508, jay.burch@nrel.gov 160PDF Image | 4th Annual Chena Renewable Energy Fair
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