Pool boiler reflux solar receiver for Stirling dish-electric systems

Conference · Sat Dec 31 23:00:00 EST 1988

DOI:https://doi.org/10.1109/IECEC.1989.74747· OSTI ID:6123284

Andraka, C. E.; Moreno, J. B.

The feasibility of competitive, modular bulk electric power from the sun may be greatly enhanced by the use of a reflux heat pipe receiver to combine a heat engine such as Stirling with a paraboloidal dish concentrator. This combination represents a potential improvement over previous successful demonstrations of dish-electric technology in terms of enhanced performance, lower cost, longer life, and greater flexibility in engine design. There are, however, important issues and unknowns which must be addressed to determine engineering feasibility of these devices. In the pool boiler reflux receiver, concentrated solar radiation causes liquid metal (sodium or potassium) to boil. The vapor flows to the engine heater heads, where it condenses and releases the latent heat. The condensate is returned to the receiver absorber pool by gravity (refluxing). This is essentially an adaptation of heat pipe technology to the peculiar requirements of concentrated solar flux, and provides many advantages over conventional heated tube receiver technology. Boiling theory indicates that long-term stable boiling of liquid metal may be difficult to achieve. Laboratory scale experiments have been performed. Initial tests confirmed that boiling is unstable in a baseline boiler. Boiling stability was established after the addition of ''artificial cavities'' to the heated surface, and successful boiling of sodium was demonstrated for 100 hours. Other stabilizing influences may have been present, and will be discussed. The flux and geometry closely simulated a real receiver. The results of these tests are presented, along with the design of a full scale receiver for on-sun testing and considerations for long term operation. 15 refs., 10 figs.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6123284
• Report Number(s): SAND-89-1311C; CONF-890815-3; ON: DE89011842
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
ALKALI METALS
BENCH-SCALE EXPERIMENTS
BOILERS
CONVERSION
ELEMENTS
ENERGY CONVERSION
ENERGY TRANSFER
EQUIPMENT
FEASIBILITY STUDIES
FLUIDS
HEAT TRANSFER
LIQUID METALS
LIQUIDS
METALS
PARABOLIC DISH REFLECTORS
PARABOLIC REFLECTORS
PERFORMANCE TESTING
POTASSIUM
RADIATIONS
SAFETY
SODIUM
SOLAR CONCENTRATORS
SOLAR EQUIPMENT
SOLAR RADIATION
SOLAR RECEIVERS
SOLAR REFLECTORS
STELLAR RADIATION
STERLING EVENT
TESTING
VELA PROJECT