A radiator as a heat exchanger of the invention includes: an upper tank into which a cooling water flows; a core in which fluid from the upper tank is heat-exchanged; and a lower tank that collects the fluid from the core. A baffle plate is provided inside the upper tank, the baffle plate dividing an inner space into a lower space and an upper space and provided with a communication opening that communicates between the lower space and the upper space. A bent portion bent toward the lower space is provided at each a longitudinal end of the baffle plate.

A combo-cooler includes heat exchangers having parallel tubes corresponding to each heat exchanger aligned in a tube plane. A first end tank assembly includes a columnar end tank separated by a baffle into compartments each in fluid communication with a respective hydraulically independent fluid circuit. The second tank assembly includes manifolds aligned in a column. Serially adjacent manifolds are in slidable contact or separated by a respective gap to allow relative translation. Banks of the tubes are brazed in fluid communication with a compartment and a manifold to connect the compartment and the manifold to have a respective fluid flow therethrough. A bracket contacts at least two of the serially adjacent manifolds to prevent translation between the bracket and the serially adjacent manifolds perpendicular to the tube plane and to allow relative translation between the at least two of the serially adjacent manifolds parallel to the tubes.

A pressure and/or temperature relief header for use in an HVAC heat transfer coil includes a main body adapted to he secured to bends in fluid coils of the HVAC fluid tube system, The main body includes holes in alignment with holes formed in the bends to enable liquid to pass from the bends into the expansion relief header. The expansion relief headers include a pressure release valve that automatically opens, preferably in response to pressure exceeding a predetermined threshold value or temperature falling .sup.-below a predetermined value, to release liquid from the expansion relief header and then reseats. A discharge housing collects liquid released through the pressure release valve. A sensor detects the presence of liquid in the discharge housing.

An expansion relief header and its method of operation are disclosed for use in an HVAC heat transfer coil. The expansion relief header includes a main body adapted to be secured to bends in fluid coils of the HVAC fluid tube system. The main body includes holes in alignment with holes formed in the bends to enable fluid to pass from the bends into the expansion relief header. The expansion relief headers include one or more relief devices, such as valves, that automatically open, preferably in response to pressure exceeding a predetermined threshold value or temperature falling below a predetermined value, to release fluid from the expansion relief header and then reseat themselves.

A multi-piece heat exchanger for transferring heat between a hot working fluid and a coolant according to the disclosure includes a multi-piece shell, a core, and first and second expansion joints. The multi-piece shell is arranged around an axis and receives coolant therein. The core is located within the shell and direct a hot working fluid therethrough.

A heat exchanger assembly including an elongated tubular heat exchanger enclosure defining an interior chamber. A tube sheet is positioned within the interior chamber of the heat exchanger enclosure separating the interior chamber into a shell side and a channel side. The interior portion is configured to removably receive a tube bundle positioned within the shell side of the interior chamber. An annular sleeve member is positioned within the channel side of the interior chamber of the heat exchanger enclosure. An annular elastic torsion member is positioned within the channel side of the interior chamber of the heat exchanger such that the sleeve member is positioned between the tube sheet and the elastic torsion member. The elastic torsion member has an inner circumference deflectable relative to its outer circumference for torsioning the elastic torsion member.

A multi-piece heat exchanger for transferring heat between a hot working fluid and a coolant according to the disclosure includes a multi-piece shell, a core, and first and second expansion joints. The multi-piece shell is arranged around an axis and receives coolant therein. The core is located within the shell and direct a hot working fluid therethrough.