Water box mixing manifold

A heat exchanger, comprising:

• a water box configured to direct a fluid from a first pass of the heat exchanger to a second pass of the heat exchanger;
• and
• a fluid mixing manifold disposed within the water box, wherein the fluid mixing manifold comprises:
• a plurality of sampling conduits configured to collect and mix a plurality of flows of the fluid from a respective plurality of locations within the water box;
• a mixing junction fluidly coupled to each sampling conduit of the plurality of sampling conduits, wherein the mixing junction is configured to mix the plurality of flows of the fluid to generate a mixed fluid;
• and
• a discharge port fluidly coupled to the mixing junction and configured to discharge the mixed fluid into the water box.

A heating ventilation, air conditioning, and refrigeration (HVAC&R) system, comprising:

• a heat exchanger comprising a shell, a water box coupled to the shell, a partition disposed within the shell to define a first volume within the shell and a second volume within the shell, a first subset of tubes disposed within the first volume and configured to direct a fluid into the water box, and a second subset of tubes disposed within the second volume and configured to receive the fluid from the water box;
• and
• a fluid mixing manifold disposed within the water box, wherein the fluid mixing manifold is configured to collect a plurality of flows of the fluid from a respective plurality of locations arrayed along a height of the water box and configured to mix the plurality of flows to generate a mixed fluid;
• and
• a temperature sensor disposed within the fluid mixing manifold and configured to detect a temperature of the mixed fluid.