In this issue:
  • Cold Plate Cooling Technology
  • When to Use Thermoelectric Coolers
  • Cooling Energy Storage Battery Enclosures
  • Filter Fans

Featured video:

video thumb 2 v2 Real Cold Plate application. Image courtesy of Additive Manufacturing Magazine

Cold Plate Cooling Technology

Electronic devices in enclosures such as data centers or industrial enclosures as well as powerful lithium ion batteries used in the automotive and transportation industries sometimes get so hot they need more direct cooling.

Cold plate cooling is essentially creating a heat sink with a channel to circulate a liquid from an inlet connected to a cool liquid source, pump it through the plate and expel the liquid through an outlet to circulate the liquid that was heated, through exposure to electronic circuits giving off heat, to an external device that will cool the liquid before returning it to the inlet of the cold plate. The external cooling device used is usually an air to water heat exchanger.

The effect of introducing a cooling liquid into the heat sink is to 'super cool' the device(s) in- contact with the cool plate by providing more heat transfer capability. The coolant could be water or a refrigerant.


Screen capture of Peter Zelinski and Stephanie Hendrixson describing the cold plate application in the electric vehicle. Image courtesy of Additive Manufacturing Magazine.

The first video shows a design process for a custom cold plate to be created through 3D printing (additive manufacturing) run time is 04:22. The second video shows a practical application of a 3D printed cold plate to cool an inverter in an electric vehicle and runs ~20 min.

An air to water heat exchanger is readily connected to a cold plate by connecting the heat exchanger's outlet port to the cold plate's inlet and the heat exchanger's inlet port to the outlet of the cold plate. The heat exchanger is external to the device(s) being cooled and could be mounted on a cabinet wall. It requires power and a water flow regulator is used to control fluid flow and thereby temperature.

If you're interested in viewing a video on the 3D design of this product, click here.


When to Use Thermoelectric Coolers

The thermoelectric effect, also called the Peltier effect after its inventor Jean Charles Athanase Peltier, is the direct conversion of temperature differences to electric voltage and vice-versa.

It works by the fact that when two dissimilar conductive or semiconductor materials are fused together to form an electrical junction, and a current is passed through that junction, the material on one side of the junction heats, while the other side cools. This creates heat transfer that can be used for cooling an enclosed space. Since the direction of heating and cooling is determined by the polarity of the applied voltage, thermoelectric devices can also be used as temperature controllers.

Peltier cooling units are mainly used for applications requiring a lesser amount of cooling 100 to 2,750 BTU/hr (~ 30 - 800 W). Unlike conventional cooling units, Peltier devices can be mounted in any position—keeping your condensate management in mind. With a protection rating of IP 66, they can be used both for indoor and outdoor applications.














Cooling Energy Storage Battery Enclosures

A major EV power distribution and charging station manufacturer needed a cooling solution for their energy storage batteries in their power substation supplying power to nearby EV charging stations. They turned to Seifert's Progressive Series using an 8,500 BTU/Hr A/C unit in each enclosure.