Stoves and furnaces – Heaters – Surface
Patent
1975-08-21
1976-10-26
Sprague, Kenneth W.
Stoves and furnaces
Heaters
Surface
126270, F24J 302
Patent
active
039877841
ABSTRACT:
Disclosed is a solar energy absorber panel comprising a heat absorbing and conducting sheet and an array of fluid conduits in thermal contact with the sheet. For a given efficiency, the weight of the panel is minimized by providing a sheet thickness of between about 0.001 inch and about 0.006 inch and a conduit density of between about 3 and about 7 conduits per foot. To precisely accomplish the weight minimization, for given operating parameters (i.e., effective insolation level per unit area, S.sub.eff and sheet internal temperature difference, T.sub.L -T.sub.O), the sheet thickness, t.sub.s, is chosen to minimize the panel weight per unit area, WA, where ##EQU1## WHERE P.sub. S IS THE SHEET MATERIAL'S DENSITY, W.sub.T IS THE WEIGHT PER UNIT LENGTH OF CONDUIT, K.sub.S IS THE SHEET'S THERMAL CONDUCTIVITY, AND W is the conduit width in contact with the sheet. For the value of t.sub.s thus determined, the conduit spacing, L, is determined as L = (8(T.sub.L - T.sub.O)k.sub.s t.sub.s /Seff)1/2.
REFERENCES:
patent: 2208789 (1940-07-01), Cally
patent: 2358476 (1944-09-01), Routh et al.
patent: 2448648 (1948-09-01), Zideck
patent: 3194228 (1965-07-01), Bargues
patent: 3399664 (1968-09-01), Suhay
patent: 3916871 (1975-11-01), Estes et al.
Kennecott Copper Corporation
Lorusso Anthony M.
McCarter Lowell H.
Sniado John L.
Sprague Kenneth W.
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