Heat exchange – Conduit within – or conforming to – panel or wall structure – Opposed plates or shells
Patent
1992-09-29
1994-02-22
Flanigan, Allen J.
Heat exchange
Conduit within, or conforming to, panel or wall structure
Opposed plates or shells
165185, F28F 312
Patent
active
052879194
ABSTRACT:
A gas-fired apparatus for high-volume commercial cooking comprises double-sided griddles, each having a lower platen with a horizontal top cooking surface and an upper platen with a bottom cooking surface. The upper platen of each griddle is moved into a horizontal position in contact with the food, presses downward on the food until it reaches a predetermined level above the lower platen, and stops there. It is lifted away when the food is cooked. Heated oil (maintained at substantially constant pressure by a weight controlled valve) is circulated through a first heat exchanger, which contacts, and transfers heat to, the lower platen, and through a second heat exchanger, which contacts, and transfers heat to, the upper platen. Each heat exchanger comprises three contiguous flat metal layers. The inner layer has a spiral-like passage for the oil to flow through, to heat an outer layer and maintain a substantially uniform temperature over its outer surface. Shape and dimensions for the passage may be determined in part by a finite element thermal conduction computer program. To minimize stresses in the inner plate and differences in thermal expansion among the layers, the passage may be cut out by a laser.
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Barnhart John S.
George, II Paul E.
Flanigan Allen J.
Gas Research Institute
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