Patent ID: 8820224

Claim:
A vat system comprising: a vat that includes a bottom wall and side walls extending upwardly from the bottom wall and an inside space of the vat defined inwardly of the bottom and side walls; and a heat exchanger provided in at least one of the bottom and side walls, including: (i) a pair of sheets comprising an inner sheet arranged relatively closer to the inside space of the vat and an outer sheet arranged relatively further from the inside space of the vat, wherein the inner and outer sheets are connected through an array of connections at spaced-apart connection locations with at least parts of the inner and outer sheets being spaced from each other and defining a void space of the heat exchanger inwardly of curved cross-sectional profile segments of the outer sheet between adjacent connection locations of the inner and outer sheets, the void space of the heat exchanger being configured to convey a heat transfer fluid therethrough; and (ii) a baffle extending between and connecting the sheets to each other, at least part of the baffle being spaced inwardly from an outer periphery of the heat exchanger and directing flow of the heat transfer fluid through the void space of the heat exchanger.