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3.2 FAFCO • Produced and tested full-scale prototypes of new thermosiphon system designs. • Tested new designs incorporating overheat protection and freeze protection. 3.3 NREL • Managed industry and university contracts. • Produced new ICS models and a new thermosiphon model to accommodate new features. • Produced new test protocols for ICS systems, for SRCC use. • Characterized venting overheat protection. • Characterized pipe-freeze protection with freeze-protection valves and freezable polymer piping. • Tested and determined lifetime of polymeric materials for glazings and absorbers (see companion project description, Materials Durability). • Measured creep properties of candidate polymer heat exchanger materials. • Characterized CaCO3 scale rate at high supersaturation for candidate polymer heat exchanger materials. 3.5 Thermal Energy System Specialists, Inc. • Implemented a series of ICS models with capability of variable top loss coefficients and immersed heat exchangers of several types. 3.6 Solar Rating and Certification Corporation • Maintained certification documents and directories, with more than 400 certified systems and 110 certified collectors. • Adopted new testing procedures for ICS systems. 4. Planned FY 2006 Activities 4.1 DEG/SE • Revise mold to eliminate remaining leaks. • Produce 80 prototypes and install in large pilot program. Details are available in “SunCache Residential Solar Water Heating System – Phase VI” in the Solar Program Review Proceedings CD. 4.2 FAFCO Refine and test thermosiphon and active system designs. Produce 100 prototypes in a small-scale production run (mid-2006). Pipe-freeze protection is crucial to extending the geographical domain of these low-cost systems. As in Fig. 5a above, passive system deployment is currently limited to Florida, California, and Arizona, due to the practice of using insulated copper piping. With a freeze-protection valve installed as in Fig. 6, the market can be extended to more than half the country, as shown in Fig. 5b. It is essential • in this approach that the supply/return pipe be freezable, as the freeze-protection valve may fail. • NREL is testing three brands of PEX piping approved for potable water use, which is currently at about 400 freeze-thaw cycles without breaking. Collector Return piping Fig. 6. An indirect thermosiphon system is shown, with a freeze-protection valve mounted at the roofline just before the return pipe enters conditioned space. • Install 60 systems through existing dealer network. • Refine manufacturing plans. Details are available in “Innovative Low-cost Polymer Solar Domestic Water Heater” in the Solar Program Review Proceedings CD. 4.3 NREL Storage Freeze Protection Valve located HERE! Supply piping Mains Inlet House load 3.4 University of Minnesota • Demonstrated a means to stratification in shallow ICS tanks. • • • • • • Manage industry and university contracts. Test pipe-freeze protection approach. Test glazed and unglazed thermosiphon systems. Develop new model calibration procedures for three types of thermosiphon. Continue durability testing of industry- proposed and candidate materials (more details in Materials Durability). Prepare to issue RFPs for low-cost cold- climate SWH, focused on balance of systems and contingent on sufficient FY 2006 funding. Solar Thermal R&D Solar Heating and Lighting To drain Aux Tank promote 133PDF Image | DOE Solar Energy Technologies Program
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