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Great article Joe. I am involved with a client right now who is asking my company to design hardware to provide hydrolysis for 70,000 gallons of water per month. The purpose being to provide H(2) for combustion. Your post and calculation are valuable to that effort and have been saved and printed off. Many thanks for the good description and the calculation. They will be used.
The short answer is yes. As the system pressure increases it presents more resistance to the compressor. Thus your flow rate will decrease. That is why you will see compressors rating at 40 PSI to be higher than and 90 PSI. The other point is that since your meter is calibrated for 100 PSI, readings will be inaccurate until that pressure is reached.
In a compressed air system where the system is at zero psig. a compressor is started and loaded to fill the system. Is it safe to say that the velocity is so great that the meter reading exceeds compressor rated value? I ask this because as the system pressure increased the flow decreased even though the compressor was still fully loaded. The meter is a mass flow design for 100 psig. system.
Joe, I like your explanation of gas flow measurements. It is very clear and useful. While many engineers do not deal with this aspect most of the time, it does come up. It is nice to see it so well laid out, especially the measurement aspects.
In a bid to boost the viability of lithium-based electric car batteries, a team at Lawrence Berkeley National Laboratory has developed a chemistry that could possibly double an EV’s driving range while cutting its battery cost in half.
Using Siemens NX software, a team of engineering students from the University of Michigan built an electric vehicle and raced in the 2013 Bridgestone World Solar Challenge. One of those students blogged for Design News throughout the race.
Robots that walk have come a long way from simple barebones walking machines or pairs of legs without an upper body and head. Much of the research these days focuses on making more humanoid robots. But they are not all created equal.
For industrial control applications, or even a simple assembly line, that machine can go almost 24/7 without a break. But what happens when the task is a little more complex? That’s where the “smart” machine would come in. The smart machine is one that has some simple (or complex in some cases) processing capability to be able to adapt to changing conditions. Such machines are suited for a host of applications, including automotive, aerospace, defense, medical, computers and electronics, telecommunications, consumer goods, and so on. This discussion will examine what’s possible with smart machines, and what tradeoffs need to be made to implement such a solution.