Stoves and furnaces – Solar heat collector – With means to convey fluent medium through collector
Patent
1996-09-27
1998-12-22
Jones, Larry
Stoves and furnaces
Solar heat collector
With means to convey fluent medium through collector
126667, 126671, 126674, 126680, 126684, 126681, F24J 230
Patent
active
058508317
ABSTRACT:
This invention reduces a molten salt, solar central receiver's size, pressure loss and cost by using a loose-tight-loose twist, twisted-tape insert inside the receiver's tubes to enhance the tube's heat transfer coefficient. This twist staging is designed to provide a higher heat transfer coefficient in the receiver's central region where the solar flux is high and a reduced pressure loss at the low solar flux entrance and exit end regions. Because the twisted-tape enhances the tube's heat transfer ability it can be made larger in diameter than a smooth bore tube at an equivalent pressure loss. This reduces the number of tubes which results in a substantial reduction in receiver cost.
REFERENCES:
patent: 4044753 (1977-08-01), Fletcher et al.
patent: 4384550 (1983-05-01), Miller
patent: 4485803 (1984-12-01), Wiener
patent: 4641705 (1987-02-01), Gorman
patent: 4993485 (1991-02-01), Gorman
Friction and Heat Transfer Characteristics in Turbulent Swirl Flow Subjected to Large Transverse Temperature Gradients, Journal of Heat Transfer, Feb. 1968, p. 87, R. Thorsen, F. Landis.
Boeing North American Inc.
Field Harry B.
Jones Larry
Kahm Steven E.
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