Introduction A number of years ago I attended a meeting at Purdue University to discuss future challenges and goals for electronics cooling research. One topic that generated a significant amount of interest was, what magnitude of heat flux represented a substantial challenge that the electronics cooling community should be striving to meet with new developments. The closest … [Read more...]
Transient Thermal Calculations for Skin Contact by Wearable Devices
Introduction Mobile and wearable electronic devices are truly ubiquitous these days. Thermal engineers involved in the design of these devices are not only attentive to managing the temperature of the various components within these devices, but they are also careful to ensure that the temperature on the outer shell of these devices never exceeds certain limits as specified in … [Read more...]
On-site Cogeneration for Reducing Data Center Primary Energy Use
As most readers are aware, the data center industry has put an increased focus on energy efficiency and environmental impact. Data centers in the United States are estimated to consume nearly 2% of the total electricity. The de facto metric used in the data center industry to evaluate energy efficiency has been the Power Usage Effectiveness (PUE), as defined by The Green Grid … [Read more...]
Thermocouples Basics Part 2: How They Are Made and Its Measurement System
Continuing from part 1, and the advantages of thermocouples, we will now visit the process to make a thermocouple and its measurement system. The way thermocouples are made is very simple. We have a thermocouple welder, shown in Figure 1, as a small machine. The ends of the two wires are twisted to digital wires together, and then each set of wires touches to the point where … [Read more...]
Thermocouple Basics Part 1: Advantages to Multi-Channel Isolated Thermocouples
Multichannel isolated thermocouples is a system that RECOM developed for use in a test lab. We will discuss how this will be useful for others to know the advantages and disadvantages of such a system. What is a thermocouple? It is two different types of metals that are joined together. In figure 1, we have a metal that's called chromel, and another one called alumel. When … [Read more...]
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