Measuring Air Flow - Air Density and Direct Air Flow Measurement Part 2 w/ Jim Bergmann

HVAC School - For Techs, By Techs

Bryan Orr

Training, Careers, Airconditioning, Self-improvement, Hvac, Business, Education, Refrigeration, Heating, Ac, Apprenticeship

4.8 • 985 Ratings

🗓️ 24 July 2017

⏱️ 48 minutes

🔗️ Recording | iTunes | RSS

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Summary

In this podcast episode, Jim Bergmann continues talking about standard air, air density, and mass vs. volume as well as some other methods of "directly" measuring airflow. It gets pretty deep.

Airflow hoods and vane anemometers can give you direct airflow measurements.

You use static pressure probes, not pitot tubes, to measure TESP. When measuring static pressure, you put the negative probe in the return and the positive probe in the supply. Then, you measure the TESP (away from wiring and airflow). However, air pressure fluctuates as that air moves in the duct. Velocity pressure occurs when air moves and creates turbulence. The blower moves air, which has weight. As such, density, volume, and mass are all important as well. As air density changes, the CFM remains constant at a variable mass flow rate.

When it comes to using any tool for measuring airflow, static pressure, etc., all tools are an investment of money and time; you must spend some time learning how to use those tools. You will discover those tools' limitations and must learn how to work with or around those limitations.

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Transcript

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0:00.0	This episode of the HVAC School Podcast is made possible because of Carrier, Testo and Rector Seal. And one rector seal product that I'm really
0:15.0	excited to see come on the market is the rector seal pro fit flaring tool.
0:19.4	It is actually a flaring tool that fits onto the regular chucks, so it has the regular hex
0:24.9	chuck that you can put onto an impact driver or a 18 volt cordless drill, and it makes an amazing burnished
0:32.0	flare. I've used similar products in the past
0:34.6	and it actually rotates, it spins as it goes into the line.
0:38.1	And if you need to make a flare fitting,
0:39.5	this tool actually makes 45 degree flares
0:42.2	and it burnishes them. They're actually like shiny, shiny. tool actually
0:43.6	like shiny, shiny, clean on the surface, which is exactly what you want if you're
0:47.4	going to make a good flare. As you know, any imperfections in that flare
0:50.7	surface where it meets the cone is what can result in leaking. in that
0:53.2	can result in leaking.
0:54.6	So I'm really excited about this product
0:56.4	and according to Rector Seal,
0:58.0	it should be out on the market very, very soon.
1:00.4	In the next couple weeks, you should start to see it hit shelves and that is the
1:03.7	rector seal pro fit kit also I want to thank our new product sponsor Parker
1:09.9	Sporlin and the Zoomlock tool. Meet Zoomlock, the 10 second flame-free refrigerant
1:14.8	fitting from Parker.
1:16.1	Reduce labor costs by 60% with no braising, no flame,
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	...

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