Fundamental Laboratory HVAC Test & Tune-up · 2009. 12. 10. · Review and reestablish basic design ... Lab02-102 Lab02-224 Lab02-227 Lab02-247B Lab02-422 Lab70-123 Lab70-269 Lab70-295

Facilities and Environmental Energy TechnologiesFacilities and Environmental Energy Technologies

Presented by:Presented by: Geoffrey C. Bell, PEGeoffrey C. Bell, PE

Fundamental Laboratory Fundamental Laboratory HVAC Test & TuneHVAC Test & Tune--upup

Determining LaboratoryDetermining Laboratory--space Performance and space Performance and Identifying EnergyIdentifying Energy--Efficiency Opportunities Efficiency Opportunities


Approach Overview Approach Overview 1.1. Review and reestablish basic design criteriaReview and reestablish basic design criteria

2.2. Engage EH&S support Engage EH&S support

3.3. Walk siteWalk site

4.4. Begin Lab Test and TuneBegin Lab Test and Tune

5.5. Determine air change rate (ACH)Determine air change rate (ACH)

6.6. Test fume hoodsTest fume hoods

7.7. Tune fume hoodsTune fume hoods

8.8. ResultsResults

9.9. Next stepsNext steps


1. 1. Review and reestablish basic design Review and reestablish basic design criteriacriteria……

LBNL design criteria:LBNL design criteria:

Laboratory air change rate: 1 CFM/sq ft of floor areaLaboratory air change rate: 1 CFM/sq ft of floor area

Fume hood face velocity setFume hood face velocity set--point: 100 FPM averagepoint: 100 FPM average

Laboratory differential pressure: Laboratory differential pressure: --0.020.02”” w.g.w.g.

Ensure current design criteria promote both Ensure current design criteria promote both mission safety and energy efficiencymission safety and energy efficiency

Presenter

Presentation Notes

LBNL lab differential pressure standard is -0.02" W.G. (compared to surrounding spaces). Work performed under this “test and tune-up” must not cause any lab to go more positive.


2. Engage EH&S support2. Engage EH&S supportProvides conduit to Provides conduit to knowledge and authority…knowledge and authority…

Discuss key areas of interest Discuss key areas of interest and concernand concern

Explain operational Explain operational requirementsrequirements

Learn about known problems Learn about known problems and deficiencies and deficiencies

Identify obvious energy waste Identify obvious energy waste indicators with EH&S staffindicators with EH&S staff


3. Walking the site …3. Walking the site …

What do you What do you expectexpect to see?to see?

What What lookslooks wrong or is missing?wrong or is missing?

What are your What are your assumptionsassumptions??

What What combinationcombination of effects of effects would add up to this result?would add up to this result?

What are the possible What are the possible causescauses??

What are the energy and What are the energy and operational operational impactsimpacts??


4. Before beginning Lab 4. Before beginning Lab Test and TuneTest and Tune……Examine the “usual suspects…”Examine the “usual suspects…”

Review drawing archiveReview drawing archive

Study EMCS historyStudy EMCS history

Compared meter data & trendsCompared meter data & trends

Inform researchers for safety and “buy in”…Inform researchers for safety and “buy in”…Schedule time and stick to it!Schedule time and stick to it!

Practice routine, refine, and adapt as necessaryPractice routine, refine, and adapt as necessary

Provide feedback of results Provide feedback of results


5. Determine a5. Determine air change rateir change rate

Monitor lab differential pressureMonitor lab differential pressureDetermine whether room has active Determine whether room has active pressure control.pressure control.

Monitor lab differential pressure (Monitor lab differential pressure (ΔΔP) P) with local instrumentwith local instrument

Compare local measurement with EMCS Compare local measurement with EMCS valuevalue

Record Record ΔΔP continuously during tuneP continuously during tune--up up process and sash position changesprocess and sash position changes


5. Determine a5. Determine air change rateir change rate……

Resolve air flow rates Resolve air flow rates Locate and check supply and general Locate and check supply and general exhaust flow rates with balance hood.exhaust flow rates with balance hood.

Record three sets of airflow data: Record three sets of airflow data: asas--found condition; sashes fully open; found condition; sashes fully open; sashes fully closed (or min.).sashes fully closed (or min.).

Calculate room area and volume: Calculate room area and volume: use laser measuring/dimensioning use laser measuring/dimensioning devicedevice without regard to furnishings.without regard to furnishings.

Compute supply/exhaust offset volume Compute supply/exhaust offset volume (exhaust volume should exceed supply).(exhaust volume should exceed supply).

Record findings. Record findings.


5. Determine a5. Determine air change rateir change rate……Calculate air change rate Calculate air change rate

Use room total exhaust volume flow, Use room total exhaust volume flow, i.e., combine fume hood and general i.e., combine fume hood and general exhaust airflow.exhaust airflow.

Compute rate for both sashes fully Compute rate for both sashes fully open and sashes fully closed (or open and sashes fully closed (or minimum position) per: minimum position) per:

CFM per sq ft (lab area)CFM per sq ft (lab area)..

Air changes per hour (ACH) Air changes per hour (ACH) (Exhaust airflow volume per cubic (Exhaust airflow volume per cubic foot labfoot lab--space volume per hour; space volume per hour; (CFM x min/hr)/CF= #/hr) .(CFM x min/hr)/CF= #/hr) .



6. 6. Test Test ffume hoodsume hoodsCatalog lab fume hood data Catalog lab fume hood data

Obtain fume hood data from EH&S.Obtain fume hood data from EH&S.

Note building and room number.Note building and room number.

Photograph asPhotograph as--found conditions. found conditions.

Record number, type, and size of hood.Record number, type, and size of hood.

Sketch lab layout with locations of fume Sketch lab layout with locations of fume hood(s), supply register outlets, and hood(s), supply register outlets, and general exhaust inlets.general exhaust inlets.

Compare with database provide by EH&S; Compare with database provide by EH&S; note discrepancies. note discrepancies.



6. 6. Test Test ffume hoodsume hoods……

Face velocity measurements Face velocity measurements Measure face velocity & record Measure face velocity & record supply & general exhaust flow supply & general exhaust flow rates and lab rates and lab ΔΔP at: P at:

Fully open sash: Fully open sash: with ninewith nine--point grid point grid

Sash open to 18 inches: Sash open to 18 inches: with sixwith six--point grid. point grid.

Sash open to 6 inches (or minimum): Sash open to 6 inches (or minimum): with threewith three--point grid. point grid.


Courtesy Exposure Control Technologies, Inc.

Presenter

Presentation Notes

Measurement techniques must conform with ANSI/AIHA Z9.5 and ASHRAE 110. Confirm nine-point grid adequate for full-open sash measurements. Indicate use of thermoanemometer or Velgrid averaging.


7. 7. TuneTune ffume hoodsume hoods

Face velocity adjustments Face velocity adjustments Ensure lab Ensure lab ΔΔP is monitored during P is monitored during tunetune--up with local instrument. up with local instrument.

Position sash to 18 inches open. Position sash to 18 inches open.

Adjust average face velocity to 100 Adjust average face velocity to 100 FPM.FPM.

Note fume hoods without adjustment Note fume hoods without adjustment capability in reportcapability in report

Recheck and record general Recheck and record general exhaust airflow volume. exhaust airflow volume.

Presenter

Presentation Notes

LBNL lab differential pressure standard is -0.02" W.G. (compared to surrounding spaces). Work performed under this “test and tune-up” must not cause any lab to go more positive. Variable Air Volume (VAV) fume hoods: Requires adjustment of face velocity controller by TAB agent familiar with particular face velocity control device. Coordinate with facilities operations and maintenance (O&M) and LBNL EH&S. Constant Volume (CV) fume hoods: Requires adjustment of balancing damper by TAB agent. Coordinate with facilities O&M and LBNL EH&S, when feasible.


7. 7. TuneTune ffume hoodsume hoods……

Install sash stop Install sash stop Position sash to 18 inches open, install sash stop. Position sash to 18 inches open, install sash stop.

Affix signage Affix signage Signage to include:Signage to include:

““Operating PointOperating Point””horizontal arrow at 18 inches, next to sash stop. horizontal arrow at 18 inches, next to sash stop.

““Close sash when leaving hoodClose sash when leaving hood””vertical arrow point downwards.vertical arrow point downwards.

““Sash opening for setSash opening for set--up ONLYup ONLY””vertical arrow pointing upwards. vertical arrow pointing upwards.

Presenter

Presentation Notes

LBNL lab differential pressure standard is -0.02" W.G. (compared to surrounding spaces). Work performed under this “test and tune-up” must not cause any lab to go more positive. Variable Air Volume (VAV) fume hoods: Requires adjustment of face velocity controller by TAB agent familiar with particular face velocity control device. Coordinate with facilities operations and maintenance (O&M) and LBNL EH&S. Constant Volume (CV) fume hoods: Requires adjustment of balancing damper by TAB agent. Coordinate with facilities O&M and LBNL EH&S, when feasible.


8. Results… 8. Results… Lab ACH & CFM/sq ft (hoods @ 18")

0 5 10 15 20 25 30

Lab02-102

Lab02-224

Lab02-227

Lab02-247B

Lab02-422

Lab70-123

Lab70-269

Lab70-295

Lab70-299

ACHCFM/sq ft

LBNL Standard: 1 CFM/sq ft


8. Results… 8. Results… Lab CFM/sq ft & DP (hoods @ 18 inches)

0.00

1.00

2.00

3.00

4.00

5.00

6.00

7.00

Lab0

2-10

2

Lab7

0-29

5

Lab0

2-42

2

Lab7

0-29

9

Lab7

0-12

3

Lab0

2-24

7B

Lab0

2-22

4

Lab7

0-26

9

Lab0

2-22

7

CFM

/sq

ft

-0.35

-0.30

-0.25

-0.20

-0.15

-0.10

-0.05

0.00

inch

es w

ater

CFM/sq ftDP

LBNL Standard: 0.02” w.g.



8. Results… 8. Results… Lab CFM/sq ft per Hood Sash Position

0.00

1.00

2.00

3.00

4.00

5.00

6.00

7.00

8.00

Lab0

2-10

2

Lab0

2-22

4

Lab0

2-22

7

Lab0

2-24

7B

Lab0

2-42

2

Lab7

0-12

3

Lab7

0-26

9

Lab7

0-29

5

Lab7

0-29

9

CFM

/sq

ft Minimum18 inchesMaximum



8. Results… 8. Results…

Airflow rate after TuneAirflow rate after Tune--up >2 CFM/sq ft up >2 CFM/sq ft


8. Results…the Bottom Line 8. Results…the Bottom Line

Case #1 Case #1 Reduce fume hood face velocityReduce fume hood face velocity

Save 721 CFM x $4Save 721 CFM x $4--$7 CFM/yr = $2,884 $7 CFM/yr = $2,884 -- $5,047/yr$5,047/yr

Payback: $600/ Lab Test & TunePayback: $600/ Lab Test & Tune--up = 2.5 to 1.5 monthsup = 2.5 to 1.5 months

Case #2 Case #2 Reduce general exhaust volumeReduce general exhaust volume


Payback: $600/ Lab Test & TunePayback: $600/ Lab Test & Tune--up = 3 to 1.7 monthsup = 3 to 1.7 months

Case #3 Case #3 Reduce bothReduce both……


Payback: $600/ Lab Test & TunePayback: $600/ Lab Test & Tune--up = 1.8 to 1 month(s)up = 1.8 to 1 month(s)


9. Next steps at LBNL9. Next steps at LBNL

Identified corrective maintenance opportunities Identified corrective maintenance opportunities Active pressure control not installed Active pressure control not installed

Lab airflow offset excessive Lab airflow offset excessive

Differential pressure inadequate Differential pressure inadequate

VAV fume hood control not installed VAV fume hood control not installed

Single fan/single hood without redundant exhaust fan Single fan/single hood without redundant exhaust fan


9. Next steps at LBNL…9. Next steps at LBNL…

Recommended lab efficiency opportunitiesRecommended lab efficiency opportunitiesReduce air change rate Reduce air change rate

Improve fume hood energy efficiency Improve fume hood energy efficiency

Determine appropriateness of existing energy Determine appropriateness of existing energy consuming equipment and processes consuming equipment and processes

DeDe--commission abandonedcommission abandoned--inin--place energyplace energy--wasting apparatus, especially fume hoods.wasting apparatus, especially fume hoods.

Identify unIdentify un--used and missused and miss--used energyused energy--consuming lab equipment and remove.consuming lab equipment and remove.


For More Information For More Information

Geoffrey C. Bell, P.E.Geoffrey C. Bell, P.E.510.486.4626510.486.4626gcbellgcbell@@lbllbl..govgov

http://http://ateamateam..lbllbl..govgov

Documents

Fundamental Laboratory HVAC Test & Tune-up · 2009. 12. 10. · Review and reestablish basic design ... Lab02-102 Lab02-224 Lab02-227 Lab02-247B Lab02-422 Lab70-123 Lab70-269 Lab70-295