2023 Summer TAB Journal Quiz

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Elevator Shaft Pressurization – What a Relief!

Dustin Fielden, TBE, Systems Commissioning & Testing, Inc.

1. What was the main issue the project team faced concerning elevator shaft pressurization on floors 3-18?(Required)

The elevators were not functioning properly during a fire alarm.

The elevator pressure fan was running at a higher airflow than required.

The stairwell pressure fans were conflicting with the elevator shaft fan.

The elevators were not properly sealed and leaking air.

Elevator Shaft Pressurization – What a Relief!

Dustin Fielden, TBE, Systems Commissioning & Testing, Inc.

2. How did the team manage to achieve the required elevator shaft pressure on all floors (3-18) after identifying the problem?(Required)

By installing barometric backdraft dampers at the end of each of the floors’ hallways.

By increasing the elevator pressure fan to the maximum airflow.

By reducing the stairwell pressure fans until they were near the minimum allowable.

By replacing the elevator doors with more airtight ones.

Airflow Measurement of Nozzle-Type Diffusers

Matthew Jesson, TBE, CxA, Systems Management & Balancing, Inc.

3. Which method of airflow measurement was found to be the most reliable for nozzle diffusers in the airport renovation project?(Required)

Flow hood

Rotating vane anemometer

Airfoil, equal-area traverse

Mini-pitot, single-point reading at the centerline

Airflow Measurement of Nozzle-Type Diffusers

Matthew Jesson, TBE, CxA, Systems Management & Balancing, Inc.

4. Based on the testing done on this project, what was the main drawback of using a flow hood for airflow measurement on nozzle diffusers?(Required)

It is too cumbersome to use for such a small opening.

It required extensive duct traversing.

The nozzle-type diffusers focus the air into a point that the hood can’t account for.

It was impossible to create a seal.

College Dorm Case Study – Value of Independent Duct Air Leakage Testing

David Forlines, TBE, Mid Atlantic Test & Balance, Inc.

5. What was the main issue encountered during the TAB work on the energy recovery unit (ERU) for the dormitory building?(Required)

Difficulty in locating the exhaust grilles.

Leaking fire dampers in the exhaust duct.

Inadequate fan coil units for heating and cooling.

Significant leakage due to improper connections in the duct system.

College Dorm Case Study – Value of Independent Duct Air Leakage Testing

David Forlines, TBE, Mid Atlantic Test & Balance, Inc.

6. What was the construction practice that led to this issue?(Required)

Shifting in the design during construction.

Completing one part of the construction and making it difficult to access the ducts to seal them.

Poor communication between the building owner and TAB agency.

Cost-cutting measures.

Got to Be a Balance Issue – Balancing a Medical Research Building after Three Years

Jimmy Pelezo, TBE, Engineered Air Balance Co., Inc.

7. What created the low static condition that caused the AHU shutdown?(Required)

The damper positions were mostly open.

The damper positions were mostly closed.

There was a leak in the ducts.

The controls were shutting down during peak hours.

Got to Be a Balance Issue – Balancing a Medical Research Building after Three Years

Jimmy Pelezo, TBE, Engineered Air Balance Co., Inc.

8. How was the problem with the AHU shutdown resolved?(Required)

The duct connections were resealed.

The controls were rebooted to the manufacturer’s settings.

A damper that had slipped on its shaft was corrected.

Dampers were installed in the surgical suites.

A Tale of Two Fume Hoods

Blake Stutts, TBE, CxA, Energy Testing & Balance, Inc.

9. How many VAV fume hoods did the general and fume exhaust system serve?(Required)

125 hoods across 16 labs.

16 hoods across 5 labs.

16 hoods across 8 labs.

116 hoods across 25 labs.

A Tale of Two Fume Hoods

Blake Stutts, TBE, CxA, Energy Testing & Balance, Inc.

10. What was the final recommendation given to the owner?(Required)

Increase the duct of the exhaust branch and floor-mounted hoods and their terminal units.

Remove the dampers and turn down the vent speed of the fume hoods.

Closing dampers to 100%.

Closing 25 of the served fume hoods to increase pressure in the remaining number.

2023 Summer TAB Journal Quiz

Suggested Drawing Specification

AIA-Format LONG-FORM SPECIFICATION

Section 230593 – TESTING, ADJUSTING AND BALANCING FOR HVAC

AIA-Format SHORT – FORM SPECIFICATION

Section 230593 – TESTING, ADJUSTING AND BALANCING FOR HVAC

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