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SH&L Systems Analysis Performing Organization: National Renewable Energy Laboratory Key Technical Contact: Jay Burch, 303-384-7508, jay_burch@nrel.gov DOE HQ Technology Manager: Glenn Strahs, 202-586-2305, Glenn.Strahs@hq.doe.gov FY 2004 Budget: $250K _____________________________________________________________________________________ Objective • Determine cost reductions needed to achieve at least 50% reduction in the cost of saved energy (COSE) for cold-climate solar domestic water heaters. Accomplishments • Simulation models were assembled for three system types: glycol, drainback, and thermosiphon. The models were the basis for U.S. performance maps and later cost of saved energy (COSE) analysis. • Cost models were assembled for three aforementioned system types with a series of hypothetical balance-of-system (BOS) and collector variations from a base case using today’s technology. • It was shown that COSE could be reduced by more than 50% if the new BOS components and selective glazed collector could be built for the hypothesized cost. Future Directions • Meetings with U.S. solar industry manufacturers and installers will be held to present analysis results and seek their input on reasonableness and desirability of the suggested R&D. • An RFP for development of low-cost, cold-climate systems will be issued when funds are available. The RFP will be focused on BOS improvements if there is consensus in the solar industry on that direction. _____________________________________________________________________________________ 1. Introduction As described in the DOE Solar Program Multiyear Technical Plan [1], the Solar Heating and Lighting (SH&L) program set the goal in FY 1998 to reduce the life-cycle cost of saved energy (COSE) for solar domestic water heater (SDWH) systems by ≥50%. In FY 1999, focus was placed on reaching this objective for passive systems in mild climates, with two teams currently wrapping up work on polymer integral collector-storage (ICS) systems. The SH&L program plan begins to focus on cold-climate SDWH in FY 2005, looking to achieve the 50%-reduction goal by FY 2009. The objective of this work is to determine if the goal of 50% in COSE is realistic for cold-climate SDHW systems. 2. Technical Approach Three system types are considered: glycol, drainback, and indirect thermosiphon. For cold climates, glycol and drainback are common, whereas the thermosiphon is relatively novel. COSE is estimated by simulating performance (at TMY2 sites) and estimating costs under a new- construction market scenario. With new construction, the installation is more efficient and marketing costs (at 25% of hardware+installation cost) are smaller, compared to the more-common “retrofit scenario” assumed in [2]. Costs are taken either as the “best available” costs provided by manufacturers or as estimated from similar products, rather than as costs from detailed analysis of specific designs. Costs include direct materials (collector and BOS hardware),PDF Image | FY 2004 ANNUAL REPORT DOE Solar
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