Commissioning Chilled Water Systems

Transcription

1 Commissioning Chied Water Systems BUILD. CONNECT. ACHIEVE. James Anderton, CPMP, CxA, LEED GA INDEPENDENT COMMISSIONING CONSULTING, LLC 0

2 Learning Objectives PRESENTATION OVERVIEW Introduction to Cx CHWS Cx CHWS: Basic Concepts Cx CHWS: Process and Fied Knowedge Functiona Testing CHWS: Best Practices Q&A 1

3 Cx Chied Water Systems (CHWS) INTRODUCTION TO Cx CHWS 2 Propery commissioned buiding systems wi provide: Less probems inherited at the end of the project Improved comfort and indoor air quaity Reduced construction and warranty issues Compete documentation and critica system operation data Better tenant and occupant satisfaction Reduced O & M costs and increased reiabiity Lower utiity bis Improved net operating Income A benchmark for future system operating evauation Fuy trained operating staff

4 Cx Chied Water Systems (CHWS) INTRODUCTION TO Cx CHWS AN EARLY START IS ESSENTIAL AQUIRE A FULL UNDERSTANDING OF: Current system design & approved documents Operationa requirements (Owner vs FM vs Designer) Robust documentation (Effective use of Cx Documents) Connecting the gaps Owner expectations vs User Experience Engineer Equipment Schedue vs Contros Drawings 3

5 Cx Chied Water Systems (CHWS) INTRODUCTION TO Cx CHWS KNOWLEDGE OF THE Cx PROCESS Design phase Construction phase Acceptance phase Occupancy & warranty phase CERTIFICATION AND EXPERIENCE (CCP, CPMP) 4

6 Cx Chied Water Systems (CHWS) Cx CHWS: BASIC CONCEPTS REQUIRED KNOWLEDGE OF THE CxA Chied Water System Design and Appications Knowedge of Chiers, Boiers, and CEP Safety 5

7 Cx Chied Water Systems (CHWS) Cx CHWS: BASIC CONCEPTS REQUIRED KNOWLEDGE OF THE CxA Knowedge of Pumps, Hydronics and Piping Knowedge of AHU s, Heat Exchangers, and Ductwork 6

8 Cx Chied Water Systems (CHWS) Cx CHWS: BASIC CONCEPTS REQUIRED KNOWLEDGE OF THE CxA Knowedge of Condenser Water Systems (As appicabe) Knowedge of Contros & Contro Loops (Foating Setpoints) 7

9 Cx Chied Water Systems (CHWS) Cx CHWS: BASIC CONCEPTS IMPORTANT KNOWLEDGE & EXPERIENCE Engineering Appications, Fuid Dynamics, Psychometrics Construction Instaation Methods and Materias Operationa & Troubeshooting Skisets Knowedge of Factory Startup Procedures (Warranty) Knowedge of Test & Baance Procedures (Air & Water) 8

10 Cx Chied Water Systems (CHWS) Cx CHWS: BASIC CONCEPTS FIELD EXPERIENCE (I went to Coege How do I get it?) Construction instaation & management Architectura & Engineering Construction Administration TAB, Contros & Service Technician Work 9

11 Cx Chied Water Systems (CHWS) Cx CHWS: PROCESS & FIELD KNOWLEDGE LAYING THE FOUNDATION FOR EFFECTIVE CX Cx CHWS requires a simpe but we defined process to catch and track issues (Good Cx wi enabe cose out of issues timey) Timeiness of response, reports, and document deivery Foow up, Foow up, and more Foow up Propery Executed Cx Process = Efficient CHWS $$$ Poory executed Cx Process = Faiure to protect Cients (If you fai to pan then you pan to fai!) 10

12 Cx Chied Water Systems (CHWS) Cx CHWS: PROCESS & FIELD KNOWLEDGE CREATING / CAPTURING ACCURATE & USEFUL DATA Detaied Startup & Prefunctiona Checkists (Non-Generic) Submitta Process (Define Registries) Making good use of the Cx Pan (Simpe anguage) Step by step instructions (When, Where, Who & What) Communication protocos Ensure task items for such miestones as Start-up are ceary defined for each Team member whom is responsibe 11

13 Cx Chied Water Systems (CHWS) Cx CHWS: PROCESS & FIELD KNOWLEDGE EFFECTIVE CONSTRUCTION PHASE Cx Instaation Observations Equipment on Site = Verification Process (Timeiness) Study up on the systems to be observed Know typica issues (Probem Areas) Focus on most common issues 1 st 12

14 Cx Chied Water Systems (CHWS) Cx CHWS: PROCESS & FIELD KNOWLEDGE Make up Water Pressure Reguator/Reief Vave Sizing (Incorrect / Under sized) 13

15 Cx Chied Water Systems (CHWS) Cx CHWS: PROCESS & FIELD KNOWLEDGE EFFECTIVE CONSTRUCTION PHASE Cx Coming out to the fied prepared (Know More!) Consistency, Methods and Thoroughness Consoidated Foor Pans (Haf-Size) System & Zone Maps Compete with Room Names Safety Gear Physicay Fit High Resoution Camera 14

16 Cx Chied Water Systems (CHWS) Cx CHWS: PROCESS & FIELD KNOWLEDGE Safety, Fitness, and Awareness needed at a times during Cx. CHWS are more compex and arger. There is more that can go wrong if you are not prepared to stay vigiant on the jobsite. 15

17 Cx Chied Water Systems (CHWS) Cx CHWS: PROCESS & FIELD KNOWLEDGE TYPICAL AND CRITICAL FIELD ISSUES Protection of System Inets & Outets AHU SA/RA/OA/EA Openings, Coi Connections, Pump inets, Motor openings, Cooing Towers & Basins, Ductwork & Piping Protection of Staged equipment & during prep and assemby Improper use of equipment during construction 16

18 Cx Chied Water Systems (CHWS) Cx CHWS: PROCESS & FIELD KNOWLEDGE TYPICAL AND CRITICAL FIELD ISSUES Piping Connections Proper Weds or Joint Types Piping Pressure Piping Supports & Vibration Isoation Proper Fasteners, Saddes, Die-Eectric separation Approved Vibration Isoation (Noisy Pipes) Insuation Requirements 17

19 Cx Chied Water Systems (CHWS) Cx CHWS: PROCESS & FIELD KNOWLEDGE Piping insuated and protected with seeve for protection on exterior appications Cearances & Piping Supports 18

20 Cx Chied Water Systems (CHWS) Cx CHWS: PROCESS & FIELD KNOWLEDGE Impropery supported CHW Suppy and Return Piping during construction. Unnecessary oad on Chier Marine Box. Potentia for damage to chier inet/outets. 19

21 Cx Chied Water Systems (CHWS) Cx CHWS: PROCESS & FIELD KNOWLEDGE TYPICAL AND CRITICAL FIELD ISSUES Comprehensive Fush-out Pan Deveop Eary (As soon as HVAC contractor is hired) Ensure pans incude specific step by step procedures By-pass Cois during initia fushing Schedue Fushing / Chemica Treatment (timeiness) Fush Water Source (Ceaniness) Drip Legs & Strainers (Cean out Incuded in Pan) Dead Ends (Maintaining Fow) 20

22 Cx Chied Water Systems (CHWS) Cx CHWS: PROCESS & FIELD KNOWLEDGE TYPICAL AND CRITICAL FIELD ISSUES Chemica Treatment Addition Pan Deveop Eary (As soon as HVAC contractor is hired) Ensure pans incude specific step by step procedures Remove By-passed Cois provide finished fushing Drain system Fuy, re-fushing ti water is crysta cear 21

23 Cx Chied Water Systems (CHWS) Cx CHWS: PROCESS & FIELD KNOWLEDGE TYPICAL AND CRITICAL FIELD ISSUES Chemica Treatment Addition Pan Maintaining Circuation whie adding chemica treatment Ensure a vaves are open (incuded in Cx Fush Pan) A feed contro equipment must be in pace Certified Contractors & TAB 22

24 Cx Chied Water Systems (CHWS) Cx CHWS: PROCESS & FIELD KNOWLEDGE Shot feeder suppy and return ines not insuated and condensation forming/dripping from connection at CHWS 23

25 Cx Chied Water Systems (CHWS) Cx CHWS: PROCESS & FIELD KNOWLEDGE TYPICAL AND CRITICAL FIELD ISSUES Locations of Vaves & Sensors 24 Design drawing ocations vs submittas Test & Baance Resuts (Troubeshooting) Verification of Sensor Readings during TAB

26 Cx Chied Water Systems (CHWS) FUNCTIONAL TESTING: BEST PRACTICES Overa System Leve Testing Goa is for test of a components on a system eve Ensure individua components are working 1 st Using BAS sensors? What is the TAB Report Status? Contros Loops (Interdependencies & Fine Tuning) Tune ony one system at a time either heating, or cooing. Do not try to tune both at the same Cascading upwards from sub-systems to parent systems Regardess of CxA preference: No PFC No FPT 25

27 Cx Chied Water Systems (CHWS) FUNCTIONAL TESTING: BEST PRACTICES Energy Management Contros Systems (BAS) Cascading Contros Loops (interdependencies) (Proportiona + Integra + Derivative = PID) P =How far away from setpoint I =Time away from setpoint D =Approach/Decay speed to/from setpoint Common Factors contributing to an unstabe system: Too much gain (too narrow a throtting range) for a proportiona system. The controed variabe has too much capacity to be reasonaby controed. Incorrect insta Often, the sensor providing feedback is ocated in a remote ocation. Too much ag time (deay) in the response of the system. 26

28 Cx Chied Water Systems (CHWS) FUNCTIONAL TESTING: BEST PRACTICES Chier, Boiers, Cooing Tower Testing Senor Locations & Readings Safeties, Interocks,Aarms Unit Capacity (Part-Load vs Fu Load) Staging (Lead/Lag & Demand Response per AHU zone) Water Temperature Reset Contro Accuracy and Stabiity (Contro Loops / Hunting) The system shoud not require the controed device to operate at an extreme position this is an indication of ost contro. 27

29 Cx Chied Water Systems (CHWS) FUNCTIONAL TESTING: BEST PRACTICES Pumping System Testing Senor Locations & Readings Safeties, Interocks,Aarms Pump Capacity (Part-Load vs Fu Load) Actuation & Sequencing Setpoints and Pressure Reset Contro Accuracy and Stabiity (Contro Loops / Hunting) 28

30 Cx Chied Water Systems (CHWS) FUNCTIONAL TESTING: BEST PRACTICES AHU System Testing Senor Locations & Readings Safeties, Interocks,Aarms (EA/RA/OA) SA Temperature Contro (Part-Load vs Fu Load) Actuation & Sequencing Setpoints, Static Pressure Reset CHW Vave Contro and Water Temp Reset Contro Accuracy and Stabiity (Contro Loops / Hunting) 29

31 Cx Chied Water Systems (CHWS) O&M: BEST PRACTICES Training provided to faciities maintenance staff (FMS) Understanding & conveying maintenance impacts to the owner Deveoping meaningfu operationa troubeshooting and system maintenance procedures Teaming with the engineer of record, contractor & manufacturer to yied better resuts 30

32 Cx Chied Water Systems (CHWS) O&M: BEST PRACTICES Typica Chier Maintenance Tasks Check setpoints Check for fouing of evaporator and condenser tubes Check water quaity Check for eaks Conduct oi anaysis and change as necessary Check strainers and vaves Check eectrica connections 31

33 Cx Chied Water Systems (CHWS) O&M: BEST PRACTICES Typica Cooing Tower Maintenance Tasks Setup a testing program/schedue for water quaity Setup strict schedue of water treatment and bown down to prevent buidup of minera deposits and premature erosion Setup a schedue for periodic ceaning Check condition of fi, wood frame, nozzes, water eve contro and degree of approach. Check for eaks 32

34 Cx Chied Water Systems (CHWS) O&M: BEST PRACTICES Typica Pump Maintenance Tasks Check for Vibration Check Bearing temperature Check for unusua noise Check for entrapped air at impeer (Cavitation effects) Check design RPM and FLA Check for eaks 33

35 Thank You James Anderton, CPMP, CxA, LEED GA Managing Principa INDEPENDENT COMMISSIONING CONSULTING 34