Abstract: A heating or cooling vessel for heating or cooling a fluid as it flows through the vessel includes an outer tubular shell and an inner tubular member mounted to the outer tubular shell. The inner tubular member includes a central passage defining a first flow path, and a space between the inner tubular member and the outer shell defines a second flow path which communicates with the first flow path at one end of the inner tubular member. A seal member is provided toward the opposite end of the inner tubular member, for cutting off communication between the first flow path and the second flow path. An inlet provides cool fluid to the first flow path, and the fluid circulates through the first flow path and into the second flow path for discharge through an outlet in communication with the second flow path.

Abstract: A vessel-type fluid cooling system includes an upper mixing chamber and a lower holding chamber, the chambers being separated by a transverse separating wall. One or more cooling tubes extend between the mixing chamber and the holding chamber, and cooling elements, such as fluid-cooled tubes, are located within each cooling tube. A heated fluid inlet provides heated fluid to the mixing chamber, and a cooled fluid outlet discharges cooled fluid from the holding chamber. Each cooling tube includes one or more inlets toward its upper end, and fluid is supplied from the mixing through the inlets to passages defined by the cooling tubes for cooling the fluid as the fluid flows downwardly through the cooling tubes. The cooled fluid is discharged into the holding chamber.