Hybrid after cooling system and method of operation

A method of assembling a pump assembly having a first and second stage for cooling process air, the method comprising the steps of:

• providing a pump and a motor coupled by a coupling arrangement, the pump having a cooling air intake, a cooling air exhaust, a process air intake, and a process air discharge;
• and
• assembling an enclosed heat exchanger comprising:
• forming first and second regions, the first region isolated from the second region;
• positioning a first stage of tubing within said first region of the heat exchanger;
• positioning a second stage of tubing within said second region of said heat exchanger, such that a baffle is between the first and second stages of tubing, wherein the first and second stages of tubing are positioned to extend along a full length of the heat exchanger, wherein the full length extends from a first side of the heat exchanger to a second side of the heat exchanger, further wherein the first region is nearer the first side relative to the second region, and the second region is nearer the second side, relative to the first region;
• forming a process air inlet fluidly coupled to the first region;
• and
• forming a process air outlet fluidly coupled to the second region;
• and
• positioning the heat exchanger relative to the pump such that within said first region said cooling air exhaust from a discharge of said pump and passes through at the first stage of tubing;
• and positioning the heat exchanger relative to the pump such that within said second region said cooling air intake of said pump passes through at the second stage of tubing, wherein the pump is configured to be cooled by cooling air flowing from the cooling air intake to the cooling air exhaust.

A pump assembly having a first and a second stage for cooling process air, the assembly comprising:

• a pump and a motor coupled by a coupling arrangement, the pump having a cooling air intake and a cooling air exhaust for a flow of cooling fluid the pump being cooled by the flow of the cooling fluid from the cooling air intake to the cooling air exhaust;
• the pump further configured to cause process air to flow from a process air intake to a process air discharge;
• and
• an enclosed heat exchanger having a process air inlet and a process air outlet coupled to the pump, wherein, the enclosed heat exchanger is isolated from the pump and the motor, but for a process air inlet and a process air outlet coupled to the pump;
• the heat exchanger comprising:
• a first region isolated from a second region by a baffle positioned between the first and second regions within the heat exchanger, the baffle comprising a separation wall that isolates the enclosed first region from the enclosed second region;
• a first stage of tubing contained within said first region wherein said cooling air exhaust of said pump is positioned at the first stage of tubing at a first cooling stage wherein said cooling air exhaust of said pump is directed at said heat exchanger such that cooling exhaust air from said pump passes from the exhaust of said pump through the heat exchanger to ambient air during operation and cools said process air during the first cooling stage;
• and
• a second stage of tubing contained within said second region, the baffle separating the first and second stages of tubing, wherein said cooling air intake of said pump is positioned at the second stage of tubing at a second cooling stage, wherein the first and second stages of tubing comprise at least one tube that extends along a full length of the heat exchanger extending from the process air intake to the process air discharge, wherein said cooling air intake of said pump is directed at said heat exchanger such that ambient air is drawn though the heat exchanger into the cooling air intake during operation and cools said process air during the second cooling stage, and further wherein said first cooling stage precedes said second cooling stage.