Low-Cost Solar Domestic Hot Water Systems for Mild Climates
In FY99, Solar Heating and Lighting set the goal to reduce the life-cycle cost of saved-energy for solar domestic hot water (SDHW) systems in mild climates by 50%, primarily through use of polymer technology. Two industry teams (Davis Energy Group/SunEarth (DEG/SE) and FAFCO) have been developing un-pressurized integral-collector-storage (ICS) systems having load-side heat exchangers, and began field-testing in FY04. DEG/SE?s ICS has a rotomolded tank and thermoformed glazing. Based upon manufacturing issues, costs, and poor performance, the FAFCO team changed direction in late FY04 from an un-pressurized ICS to a direct thermosiphon design based upon use of pool collectors. Support for the teams is being provided for materials testing, modeling, and system testing. New ICS system models have been produced to model the new systems. A new ICS rating procedure for the ICS systems is undergoing testing and validation. Pipe freezing, freeze protection valves, and overheating have been tested and analyzed.
- Research Organization:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC36-99-GO10337
- OSTI ID:
- 860939
- Report Number(s):
- NREL/CP-550-37106; TRN: US200524%%384
- Resource Relation:
- Related Information: Presented at the 2004 DOE Solar Energy Technologies Program Review Meeting, 25-28 October 2004, Denver, Colorado. Also included in the proceedings available on CD-ROM (DOE/GO-102005-2067; NREL/CD-520-37140)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
15 GEOTHERMAL ENERGY
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CLIMATES
FREEZE PROTECTION
FREEZING
GEOTHERMAL HOT-WATER SYSTEMS
GLAZING MATERIALS
HEAT EXCHANGERS
HOT WATER
LIFE-CYCLE COST
MANUFACTURING
MATERIALS TESTING
POLYMERS
SIMULATION
SOLAR HEATING
TANKS
TESTING
VALIDATION
VALVES
PV
INTEGRAL-COLLECTOR-STORAGE (ICS)
HEAT-EXCHANGES
THERMOSIPHON
Solar Energy - Thermal
Buildings
Solar Energy - Photovoltaics