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What is Building Commissioning? Presented by: Mark Leafstedt, PE CxA TestMarc x Commissioning Solutions Nevada * Colorado * New Mexico * California * Washington.

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Presentation on theme: "What is Building Commissioning? Presented by: Mark Leafstedt, PE CxA TestMarc x Commissioning Solutions Nevada * Colorado * New Mexico * California * Washington."— Presentation transcript:

1 What is Building Commissioning? Presented by: Mark Leafstedt, PE CxA TestMarc x Commissioning Solutions Nevada * Colorado * New Mexico * California * Washington * Arizona Building Performance Together

2 The Final Walkthrough ? Is it DONE done?

3 What is Commissioning (Cx)? Definition Past & Present What is Cx NOT! Objectives Economics Impediments Process Case Studies Building Performance Together

4 What is Commissioning (Cx)? Definition Past & Present What is Cx NOT! Objectives Economics Impediments Process Case Studies Building Performance Together

5 What is Commissioning (Cx)? Definition : “A quality-focused process for enhancing the delivery of a project. The process focuses on verifying and documenting that the facility and all of its systems and assemblies are planned, designed, installed, tested, operated, and maintained to meet the Owner’s Project Requirements.” Draft ASHRAE Guideline X, The Commissioning Process

6 Project Success Advocate Problem Solver Generalist not Specialist Quality Process Focus Develops Detailed Cx Plan Skilled Communicator Verifies & Documents Facilitates Training What is a Commissioning Authority Building Performance Together

7 What is Commissioning (Cx)? Definition Past & Present What is Cx NOT! Objectives Economics Impediments Process Case Studies Building Performance Together

8 The PAST The 70’s - Energy Crisis Building Performance Together

9 The PAST The 80’s – Energy Analysis Variable Air Volume Standard Building Automation Systems & Evolution Away from Pneumatics Simple to Complex HVAC Design to Maintain Comfort & Reduce Energy Utility Company Demand Side Management Programs Specialization & Division in HVAC Knowledge Building Performance Together

10 The PAST The 90’s – Energy Growth Increased Awareness of Need to Verify Increased Facility Operator Sophistication Increased Service Industry & Reliance on Better HVAC Emergence of Commissioning Industry Building Performance Together

11 The PRESENT The 2000’s – Awareness Greening of America & World Leadership in Energy Efficient Design Concern about Carbon Emissions Technology Advancements & Energy Costs Creating Favorable Alternate Energy Climate Major Growth of Cx Industry Building Performance Together

12 What is Commissioning (Cx)? Definition Past & Present What is Cx NOT! Objectives Economics Impediments Process Case Studies Building Performance Together

13 What is Cx NOT? (but encompasses) NOT: Testing, adjusting and balancing (TAB) NOT: Contractor’s startup NOT: Engineer’s installation “observation” NOT: Performance verification alone NOT: Limited to HVAC systems or Controls systems NOT: Routinely included in Professional Design Consultant’s fees NOT: MEP coordination (may assist) DOES NOT: Have responsibility to direct or make corrections to identified deficiencies Building Performance Together

14 What is Commissioning (Cx)? Definition Past & Present What is Cx NOT! Objectives Economics Impediments Process Case Studies Building Performance Together

15 Objectives/Perspectives Owner Accept an optimized building Minimized warranty issues Minimized energy costs Minimized O&M costs Maximized functionality Report on construction process Building Performance Together

16 Objectives/Perspectives Building Performance Together Design Team Constructed according to design, no less Identify construction issues early Independent perspective on design issues Extra set of observation “eyes” Contracting Team Constructed according to design, no more Identify design issues early Independent perspective on construction issues Open the project on schedule & in budget Minimized warranty issues

17 Objectives/Perspectives Cx Agent Constructed according to design, no more, no less Participate in a team environment Achieve success through the success of others Identify functionality issues & resolve prior to Owner acceptance Building Performance Together

18 What is Commissioning (Cx)? Definition Past & Present What is Cx NOT! Objectives Economics Impediments Process Case Studies Building Performance Together

19 Commissioning Economics Function of Systems’ Complexity & Extent of Services 0.5 to 3% of Total Constructions Cost 1.5 to 4% of Mechanical System Cost.5 to 3% of Electrical System Cost (Source: Commercial Energy Systems) Whole Building Commissioning: $0.5 to $1.50 Per Square Foot Operating Costs: 8 to 20% Below Non- Commissioned Buildings (Source: Kennett, NIBS) Building Performance Together

20 What is Commissioning (Cx)? Definition Past & Present What is Cx NOT! Objectives Economics Impediments Process Case Studies Building Performance Together

21 Impediments to Cx No perceived need Additional construction costs Perceived potential delays in construction Savings difficult to quantify Contractor resistance Building Performance Together

22 What is Commissioning (Cx)? Definition Past & Present What is Cx NOT! Objectives Economics Impediments Process Case Studies Building Performance Together

23 Commissioning Process Project Timeline PLANDESIGN CONSTRUCTION OCCUPANCY Owners Functional Requirements Functional Testing FPT Cx Report and Systems Manual O & M Document Review Commissioning Plan Scoping Meetings Basis of Design Review RCx Design Document Reviews O&M Training Seasonal Testing Warranty Review Pre- Functional Checklist PF Start-up Revised Plan Building Performance Together

24 Documentation Commissioning Team Basis of Design Design Intent Overview of Cx Procedures Pre-Functional Checklists Functional Performance Testing Scenarios Issues and Resolutions Logs Building Performance Together

25 Pre-Functional Checkout Building Performance Together

26 Functional Performance Test Building Performance Together

27 What is Commissioning (Cx)? Definition Past & Present What is Cx NOT! Objectives Economics Impediments Process Case Studies Building Performance Together

28 Case Study – Hydronic Systems No HW pump check valves 35% of HW valves leaking by Incorrect boiler pressure relief valves Incorrect boiler staging Reduced CHW variable speed pump setpt from 20# to 12# Cooling Tower bypass valve sticking with both valves closed. 45% of CHW & HW valves not fully closing off. Primary & secondary chilled water flows unbalanced. Building Performance Together

29 Case Study – Hydronic Systems Main chilled water DP control valve failed closed Steam condensate tank overflow discharges directly to floor drain Condensate tank pumps level switches failed No condensate return unit for DHW HW system contaminated and strainers plugged Thermometers not installed Thermometer ranges incorrect Building Performance Together

30 Case Study – Airside Systems Main fans ran with isolation damper closed in bypass mode. Static pressure hi limits do not shut down fans in bypass mode. Optimization programming modes failed Main relief fans capacities too small AHU control valve too small & does not meet design temps. Rebalanced 80% of OSA intake volumes 75% of MAU safeties not operating properly. Building Performance Together

31 Case Study – Miscellaneous No interlock between main AHU’s and VAV terminals Poor resolution and inaccurate reading of VAV CFM No heat on VAV reheat coils from contamination. Fan coil units sizes too large Programming modes incorrect for VAV operation No fiber optic connection to main fire panel Problems w/ hot/neutral reversed on 120v power. Lighting system panel BMS circuits jumpered out and graphics incorrect. Emergency Generator cannot meet design load Building Performance Together

32 References Associated Air Balance Council (AABC) & ACG (AABC Cx Group) Building Commissioning Association (BCA) American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) A Practical Guide for Commissioning Existing Buildings Portland Energy Conservation, Inc. and Oak Ridge National Laboratory eren.ed.ornl.gov/commercialproducts/retrocx.htm Building Commissioning – The key to Quality Assurance Us Dept of Energy – Rebuild America Guide Series National Institute of Building Sciences Portland Energy Conservation Inc. (PECI) Rebuild America Building Performance Together

33 What is Building Commissioning Questions? Building Performance Together


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