Stoves and furnaces – Heaters – Surface
Patent
1974-10-07
1976-06-29
Sprague, Kenneth W.
Stoves and furnaces
Heaters
Surface
165170, F24J 302
Patent
active
039658872
ABSTRACT:
A method of heating a liquid and a solar heating panel therefor is disclosed. The method comprises forming one or more obstruction free, longitudinally extending liquid passageways one side of each passageway being formed from a metallic material whereon the outer surface of said metallic material contains a solar radiation heat absorbing coating and each passageway has a width to depth ratio varying between approximately 6.5 to 15 and a mean hydraulic radius varying between approximately 0.018 to 0.027, exposing the solar radiation heat absorbing coating to solar radiation energy, and heating a liquid by passing said liquid through said passageway and simultaneously maintaining a substantially constant cross-sectional area flow path through said passageway. By such means the liquid is accelerated as same flows from one end of said passageway to the other end. The liquid is passed through said passageway while maintaining a laminar or non-turbulent flow therethrough. The width to depth ratio preferably varies between approximately 9 to 13.5 and good results have been obtained where same is equal to approximately 10. The mean hydraulic radius preferably varies between approximately 0.018 to 0.023 and good results have been obtained where same equals approximately 0.023. The solar heating panel comprises a base member having a liquid impervious upper surface, a rigid solar heat absorbing member formed from metal and mounted upon said base member, an inverted cup shaped member formed from a transparent material secured to said base member, an elastic adhesive means for securing said solar heat absorbing member to said liquid impervious upper surface, said adhesive means having flat bonding characteristics over the environmental temperature range in which said panel is to be used whereby thermal expansion of said liquid impervious upper surface relative to thermal expansion of said solar heat absorbing member occurs while maintaining a general planarity of the upper surface of the solar heat absorbing member. The inverted cup shaped member permits solar radiation to pass therethrough and impinge upon the solar radiation heat absorbing coating contained on said solar heat absorbing member for all angles of solar radiation impingement from a direction normal to the upper surface of the solar heat absorbing member plus or minus less than 90.degree.. Said base member includes a plurality of spaced apart fluid supply recesses and preferably a fluid return recess all formed in the liquid impervious upper surface thereof, and a plurality of spaced apart strips, said strips being disposed intermediate each of said recesses and adjacent to the outer side of the outwardly disposed recesses. Said strips are preferably configured whereby said metallic material is spaced above a major portion of the plan surface area of said strip by a predetermined distance.
REFERENCES:
patent: 3146774 (1964-09-01), Yellott
patent: 3174915 (1965-03-01), Edlin
patent: 3239000 (1966-03-01), Meagher
patent: 3399664 (1968-09-01), Suhay
patent: 3799145 (1974-03-01), Butterfield
Gramer Eben J.
Johnson Melvin O.
Sprague Kenneth W.
Yeung James C.
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