NEBBinar: A TAB Professional s Wish List: Equipment Procedures & Issues. March 27, 2014

Transcription

1 NEBBinar: A TAB Professional s Wish List: Equipment Procedures & Issues March 27,

2 Moderator Tom Hanlon NEBB s TAB Committee Tom has forty years of experience in refrigeration systems control system design, installation, start-up, project management, technical consultation, and systems commissioning. His level of experience allows him to act as an Owner s Representative on commissioning, retro-commissioning and sustainability projects. Has worked as an application engineer and project manager for ten years with Johnson Controls; fifteen years as an independent NEBB Testing-Balancing Commissioning Agency; six years as project manager for Trane Arkansas and recently managed multiple commissioning and sustainability projects as a contract provider for TME Inc. Tom is currently Commissioning Project Manager with the Cromwell Firm, managing and executing multiple Commissioning and Retrocommissioning projects. 1

3 Speaker Rodney Hinton NEBB s TAB Committee Rodney Hinton is the VP of Palmetto Air & Water Balance, has been involved in the South Carolina Construction industry for over 30 years. His experience includes Air Barrier Testing, Mechanical Design, Mechanical Construction, Test & Balance, Commissioning and Retro Commissioning. He is a member of the NEBB Test, Adjust and Balancing Committee. He is a Member of ASHRAE. He has been a NEBB Certified professional since 1991 and has co-authored several standards regarding TAB and BET for NEBB. 2

4 Speaker Leonard Maiani NEBB s Technical Director Leonard Maiani joined NEBB as Technical Director in January He brings over 48 years of industry experience. He began his career in the Testing, Adjusting & Balancing business in Cleveland, Ohio 1n He then spent 15 years working in Houston, Texas as a Construction Administrator and TAB professional in various organizations. In 1989, he started Maiani Construction Services in 1989 in the Pacific Northwest and, after 27 years, turned the business over to his son and joined the NEBB staff. 3

5 Agenda Overview of Testing, Adjusting and Balancing NEBB TAB Update: New Procedural Standards-Update-Release Instrument Consolidations Enhanced equipment reporting Equipment Procedures-Issues: Fan Powered VAV-Series & Parallel Energy Recovery-Heat Recovery Systems. Types, Procedures, Issues Question and Answers 4

6 Agenda Overview of Testing, Adjusting and Balancing NEBB TAB Update: New Procedural Standards-Update-Release Instrument Consolidations Enhanced equipment reporting Equipment Procedures-Issues: Fan Powered VAV-Series & Parallel Energy Recovery-Heat Recovery Systems. Types, Procedures, Issues Question and Answers 5

7 NEBB TAB Procedural Standards Update Format Change: Shall, Should, May eliminated. Now Required New Procedural Standards-Update-Release 6

8 NEBB TAB Procedural Standards (continued) The NEBB Procedural Standards for Testing Adjusting and Balancing of Environmental Systems establish a uniform and systematic set of criteria for the performance of the testing, adjusting and balancing of environmental or Heating, Ventilating and Airconditioning (HVAC) systems. Today s buildings provide highly controlled, sustainable energy efficient indoor environments. These buildings include very sophisticated mechanical systems created by a team of skilled professionals. A key member of this team is the NEBB Test, Adjust, and Balance (TAB) Certified Firm. 7

9 This Eighth Edition represents an update from past editions but remains divided into two distinct Parts: Standards and Procedures. These TAB Procedural Standards have been developed using language defined by Required as it relates to the standards and procedures described in this manual. It is important to note this wording throughout this manual and how it pertains to the NEBB standards and procedures. These standards and procedures are intended as the minimum NEBB requirements that a NEBB TAB Certified Firm must follow when performing Testing, Adjusting, and Balancing procedures. Contract documents may supersede the NEBB requirements. These TAB Procedural Standards have been carefully compiled and reviewed by the NEBB Technical Committees. 8

10 9 Instrument Requirements Changed Tuned-up

11 Enhanced Equipment Reporting-Example: Air Handling Unit (Unitary-Belt Driven) Design Data Unit designation / Area Served Unit type / arrangement / location Manufacturer Model number Total design airflow Total outlet airflow Outside airflow Fan rpm Fan motor HP (kw) Fan motor rpm Fan motor voltage Fan motor phase Total SP / External SP 10

12 11 Enhanced Equipment Reporting-Example: Air Handling Unit (Unitary-Belt Driven) Actual-Field Data Unit serial number Supply airflow Return airflow Outside airflow. Minimum, Maximum External suction SP External discharge SP External SP Fan motor manufacturer Fan motor frame Fan motor HP (kw) Fan motor rpm Fan motor operating HZ, Static Pressure Setpoint Fan motor calculated BHP (kw) Fan motor rated voltage Fan motor rated amperage Fan motor service factor Fan motor operating voltages Fan motor operating amperages Sheave manufacturer Motor sheave OD / bore Fan sheave OD / bore Adjustable sheave operating diameter Sheave centerline distance Fan rpm Belt manufacturer Number belts / size Number filters / type / size All coil and filter pressure drops ( P)

13 Agenda Overview of Testing, Adjusting and Balancing NEBB TAB Update: New Procedural Standards-Update-Release Instrument Consolidations Enhanced equipment reporting Equipment Procedures-Issues: Fan Powered VAV-Series & Parallel Energy Recovery-Heat Recovery Systems. Types, Procedures, Issues Question and Answers 12

14 Fan-Powered Terminal Units warm plenum air parallel cool primary air series 13

15 Parallel, Fan-Powered 100% heating tempering maximum primary airflow % airflow to space plenum air primary air minimum primary airflow 0% design heating load space load design cooling load 14

16 Design Data Parallel, Fan-Powered VAV terminal designation Terminal Type (Series / Parallel) Primary maximum airflow Primary minimum airflow(s) Size Fan airflow Number Filters / Size DDC address Plenum terminal mixing fan primary air supply air 15

17 Parallel, Fan-Powered Actual-Field Data Final maximum cooling airflow Final minimum cooling airflow Final primary heating airflow Fan airflow Fan speed (High, Medium, Low, Variable etc.) DDC flow correction / calibration factor(s) (where available) Include connected Grille, Register, and Diffuser data for each VAV address. Comply with 5.9 Air Outlet Test Data primary air Plenum terminal mixing fan supply air 16

18 Parallel, Fan-Powered Common Issues Issues Bad primary inlet conditions, restricted airflow - difficult DDC calibration. Remedy Specify hard duct connections, inspect installation before TAB, assist Ca & Cx. primary air Plenum terminal mixing fan Poor or no fan speed control. Difficult to set design heating airflows. Review submittals, shop drawings. Insure speed controls, speed selection methods are provided. supply air 17

19 Parallel, Fan-Powered Common Issues (continued) Issues Bad primary inlet conditions, restricted airflow - difficult DDC calibration. Poor or no fan speed control. Difficult to set design heating airflows.. Remedy Location.Location Lo cation. Review drawings, suggest terminals located in hallways, common areas. Suggest ECM motors. Quiet operation, slow ramp-up no contactor noise. Infinite adjustment. Definitive reporting. Indicate fan airflow versus DDC air flow. primary air Plenum terminal mixing fan supply air 18

20 Series, Fan-Powered 100% % airflow to space heating plenum air tempering primary air maximum primary airflow minimum primary airflow 0% design heating load space load design cooling load 19

21 Series, Fan-Powered Design Data VAV terminal designation Terminal Type (Series / Parallel) Primary maximum airflow Primary minimum airflow(s) Size Fan airflow Number Filters / Size DDC address terminal mixing fan primary air Actual-Field Data Final maximum cooling airflow Final minimum cooling airflow Final primary heating airflow Fan airflow Fan speed (High, Medium, Low, Variable etc.) DDC flow correction / calibration factor(s) (where available) Include connected Grille, Register, and Diffuser data for each VAV address. Comply with 5.9 Air Outlet Test Data plenum supply air 20

22 Series, Fan-Powered Design Data VAV terminal designation Terminal Type (Series / Parallel) Primary maximum airflow Primary minimum airflow(s) Size Fan airflow Number Filters / Size DDC address terminal mixing fan primary air Actual-Field Data Final maximum cooling airflow Final minimum cooling airflow Final primary heating airflow Fan airflow Fan speed (High, Medium, Low, Variable etc.) DDC flow correction / calibration factor(s) (where available) Include connected Grille, Register, and Diffuser data for each VAV address. Comply with 5.9 Air Outlet Test Data plenum supply air 21

23 Series, Fan-Powered Issues Bad primary inlet conditions, restricted airflow - difficult DDC calibration. Remedy Specify hard duct connections, inspect installation before TAB, assist Ca & Cx. primary air terminal mixing fan Poor or no fan speed control. Difficult to set design heating airflows. Noise.Noise. Less of an issue than parallel, still a problem!! Review submittals, shop drawings. Insure speed controls, speed selection methods are provided. plenum supply air 22

24 Series, Fan-Powered Issues Less common, requires more definitive balancing. DDC control system only reports primary air. Remedy Location.Location Location. Review drawings, suggest terminals located in hallways, common areas Suggest ECM motors. Quiet operation, slow ramp-up no contactor noise. Infinite adjustment. Fine balance required at plenum entrance to terminal. Definitive reporting. Indicate fan airflow versus DDC air flow. primary air plenum terminal mixing fan supply air 23

25 Energy Recovery Systems- Types Heat Recovery (Sensible) (Plate) Energy Recovery (Total) (Rotary Wheel) 24

26 Plate-type / Air to Air Heat Exchangers (Heat Only) Design Data Unit designation / Service Unit Location Manufacturer Model number Outside Airflow Supply Airflow Building Return/ Exhaust Airflow Unit Exhaust Airflow Plate Exchanger P (Primary & Secondary) All Filter Pressure Drops P Outside Air DB & WB Temperatures Supply Air DB & WB Temperatures Return Air DB & WB Temperatures Exhaust Air DB & WB Temperatures All Fan Data As Per Section 5.6 or

27 Plate-type / Air to Air Heat Exchangers (Heat Only) Actual-Field Data Unit serial number Outside Airflow Supply Airflow Building Return/ Exhaust Airflow Unit Exhaust Airflow Plate Exchanger P (Primary & Secondary) Outside Air DB & WB Temperatures Supply Air DB & WB Temperatures Return Air DB & WB Temperatures Exhaust Air DB & WB Temperatures All Plate and Filter Pressure Drops ( P) Number filters / Type / Size All Fan Data As Per Section 5.6 or

28 Plate-type / Air to Air Heat Exchangers Issues Limited or no access to unit for evaluation. Plugged heat exchanger passages. Burst (or breached) plate frame passages. Systems are commonly used in lab or dirty environments. Freeze-ups in the air passages!!! By-pass dampers?? Remedy Insure during prebalance inspections / site visits confirm that all testing requirements can be accomplished. Caution installing contractor to develop and maintain an aggressive filter verification program during start-up and construction phase operation. Remedy Insure caution is used during early use of units. Large differential pressures at the plates can cause rupture between airstreams..!!!! Insure that all exhaust ducts are properly sealed, properly routed and room or space relationships are as per spec. 27

29 Energy Recovery Systems- Types Heat Recovery (Sensible) (Plate) Energy Recovery (Total) (Rotary Wheel) 28

30 Wheel-type / Air to Air Exchangers (Heat or Total Exchange) Design Data Unit designation / Service Unit Location Manufacturer Model number Outside Airflow Supply Airflow Building Return/ Exhaust Airflow Unit Exhaust Airflow Transfer Wheel Purge Airflow Transfer Wheel P (Both Air Paths) All Filter Pressure Drops P Outside Air DB & WB Temperatures Supply Air DB & WB Temperatures Return Air DB & WB Temperatures Exhaust Air DB & WB Temperatures All Fan Data As Per Section 5.6 or

31 Wheel-type / Air to Air Exchangers (Heat or Total Exchange) Actual-Field Data Unit designation / Service Unit Location Manufacturer Model number Outside Airflow Supply Airflow Building Return/ Exhaust Airflow Unit Exhaust Airflow Transfer Wheel Purge Airflow Transfer Wheel P (Both Air Paths) All Filter Pressure Drops P Outside Air DB & WB Temperatures Supply Air DB & WB Temperatures Return Air DB & WB Temperatures Exhaust Air DB & WB Temperatures All Fan Data As Per Section 5.6 or

32 Wheel-type / Air to Air Exchangers (Heat or Total Exchange) 31

33 Wheel-type / Air to Air Exchangers (Heat or Total Exchange) Issues Limited or no access to unit for evaluation. Plugged and contaminated wheel surfaces. Exchange wheel deflection. Frost wheel. Bypass dampers?? Remedy Insure during pre-balance inspections / site visits confirm that all testing requirements can be accomplished. Caution installing contractor to develop and maintain an aggressive filter verification program during start-up and construction phase operation. Remedy Insure caution is used during early use of units. Large differential pressures at the wheel or using just the supply or exhaust track can cause damaging the wheel cassett..!!!! 32

34 Wheel-type / Air to Air Exchangers (Heat or Total Exchange) Issues Insure wheel seals are properly adjust by approved factory start-up. Insure purge air correct purge air settings are made prior to balancing. Conduct temperature and static pressure profiles after all airflow adjustments are successfully completed. Remedy Leaking or not properly adjusted seals will cause air transfer within the unit, resulting in less than desired airflow. Lack of purge air adjustments will cause excessive air transfer within the unit, resulting in less than desired airflow. Seals 33

35 Summary: State of Our Industry NEBB s updated Procedural Standards are a reflection of the more complex and demanding HVAC systems. Training and testing of our TAB Professionals and Technicians is increasing in intensity, frequency and rigor. NEBB is working tirelessly in our expanding sustainable environments to insure energy conservation and healthy indoor environments. Future topics..hydronic Systems 34

36 Contact Information Tom Hanlon, NEBB s TAB Committee Telephone: thanlon@cromwell.com Rodney Hinton, NEBB s TAB Committee Telephone: rhinton@palmettoairbalance.com Leonard Maiani, NEBB s Technical Director Telephone: leonard@nebb.org. 35

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