Tag Archives: airflow

Slides from the Four Part AC Performance Series

Here are the slides used during our four part series on AC System Performance.
We have also included a link to the recorded videos.

THE Total A/C System Performance Series

With sky-rocketing energy costs, restricted capital/replacement budgets, and the omnipresent concern for the bottom line, it is now more critical than ever to achieve the highest performance out of A/C and heat pump systems. You might think this is easier said than done, but that is not necessarily true! TruTech will get you there with a clear understanding of the concepts.

Based on our popular national live, national trainings and presentations and 3 years’ worth of results from thousands of contractor tests, TruTech Tools, LTD is proud to present a NEW four part series to help contractors, auditors and utility personnel learn how to:

  • measure system performance
  • increase system efficiency
  • reduce electrical consumption
  • shave peak loads
  • extend equipment service life
  • increase customer comfort and satisfaction
  • all while expanding sales, profitability and service contract opportunities

For a FREE copy of an A/C Applications Guide click HERE.

A NEW LIVE 4 PART SERIES WILL  BE SCHEDULED SOON. SLIDES AND RECORDINGS ARE AVAILABLE BELOW.

A/C System Performance Testing-  Part 1: The Big Picture

Understanding the problem and justifying the need for a System Performance approach. What are the market drivers? The A/C system has several sub-systems and each must be understood and working in harmony with the others to achieve optimum performance.

Target audience: contractors, auditors and utility personnel

RECORDED SESSION: COMING SOON.

SLIDES: Part 1 – The BIG picture AC Performance Series

 

A/C System Performance Testing-  Part 2:  AirFlow

Understanding proper AirFlow set up and measurement is at the core of AC System performance.

Target audience: contractors, auditors and utility personnel

RECORDED SESSION:  HERE
SLIDES: Part 2 -AirFlow- AC Performance Series

A/C System Performance Testing- Part 3: Refrigerant Charge
Beyond AirFlow the other key factor to optimizing A/C System Performance is understanding how to determine, measure and set the proper refrigerant charge in a system and measurement is at the core of AC System performance. Proper evacuation equipment and processes are critical to achieving the highest system efficiency.
Target audience: contractors, and utility personnel

RECORDED SESSION: HERE
SLIDES: Part 3 – Refrigerant Charge – AC Performance Series

A/C System Performance Testing- Part 4: Capacity Testing

The HVAC industry sells capacity (cooling tons), but how often is actually measured in the field? Using proper tools and techniques and a few calculations or appropriate software, technicians can now accurately measure cooling tons in minutes.
Target audience: contractors, auditors and utility personnel

RECORDED SESSION: HERE
SLIDES:  Part 4 -Capacity Testing- AC Performance Series

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Making a good airflow measurements

As you probably know, making a good airflow measurement can be one of the toughest tasks you will face. TruTechTools has found that the testo 417, large vane anemometer, offers a best in class solution to measurement of airflow at supplies and returns. You can learn more about the product HERE or see our Video of how to use it HERE. And while it is a relatively easy device to use, we have found that many people need a little coaching to get the most out of it. So, based upon our hundreds of hours training on airflow we offer 6 easy steps on how to use the testo 417, below. **************************************************************

Making an AirFlow Measurement with the Testo 417

1) Determine the OPEN AREA as follows: On RETURNS, the OPEN AREA is the 100% of the full measured area of the grille, as the air is flowing first through the 417 measuring vanes, then into the return duct. On SUPPLIES, the OPEN AREA is the fraction or percentage of the grille that the air passes through, before moving through the 417 measuring vanes. See grille manufacturers product info for open area data **. Then Multiply the Duct dimensions (Height and width) in inches by multiply of the OPEN AREA factor. FOR EXAMPLE: We have a supply grille that is 6×10 inches with 65% open area. The open area is 6 x 10 x 0.65 = 39 sq inches open area

2) ENTER the OPEN AREA into the 417. Turn ON the 417, after a few seconds the display comes up. PRESS AND HOLD the RETURN ARROW (Hold/Max/Min Key) until a number appears on the display and the in2 label is blinking. Use the UP or DOWN arrows (VOL and MEAN keys) to adjust the number in the display your open area. IN THE EXAMPLE ABOVE adjust it to 39.0

3) EXIT to measuring mode by pressing the RETURN ARROW (Hold/Max/Min Key) 5 times

4) MEASURE: Place the 4″ vane into the air stream in front of the grille position it at one corner of the grille, perpendicular to the grille surface.

a) Press the MEAN key TWICE to enter the timed average mode.

b) Press the RETURN key (Hold/Max/Min Key) when you want to start collecting data.

c) Keep the 417’s measuring head about 1″ away from the face of the grille. Move the 417 head across the grille at a rate of about 1 foot (12″) over 4 seconds. (note the timer on the 417’s screen)

d) Be sure to “paint” the entire grille face with head of the 417 to account for total flow through the grille. DO NOT paint any area more than once!

e) When you are done covering the entire grille area, press the RETURN key (Hold/Max/Min Key) again to pause the reading on the display.

OPTIONAL: You can measure again (re-paint the entire area) to improve the reading. Just start at step 4b.

5) DISPLAY the average values by pressing the MEAN key. The Timed MEAN icon will flash and the average Feet Per Minute (FPM) will be displayed. Tap the VOL key once to see the Average CFM for this test. Tap the VOL key again to see the Average Temperature for this test. Tapping the VOL key continues rotating thru these three results. NOTE: BE SURE to record the data, as there is NO memory storage in the 417. Once you tap the MEAN key again, the data is gone.

6) CLEAR the data and prepare for another measurement by tapping the MEAN key ** One manufacturer’s data books give open area factors of from 71% to 75% for one type of floor diffuser (depending on size), 66% to 75% for another model and 65% to 75% for another model. While a heavy duty, dual shutter floor grille from the same manufacturer has a range of 48% to 52% open area factor. Generally speaking, the larger the grille dimension, the small the open area factor.

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Filed under A/C and Heat Pump Products, Airflow, Training