MOO

The M & V Guided Recommissioning Process

Energy & Water Conservation ProgramSeptember 2015

MOO

EWCAgenda

• EWC Overview• Our approach• Progress

• Fault Detection• Zone & customer feedback• Variance reporting• Rogue zone diagnostics

• Existing Building Commissioning • Selection Process• GDC• BME

• M&V Plan for New Construction • EUI & 3PIM Benchmarking • BAS Trend Review

EWC

• Behavior Programs• Campus-Wide Scheduling, Resets, & Economizing• Campus-Wide Fault Diagnostics• System Component Replacements• Existing Building (EB) Commissioning• Measurement & Verification

Our Approach

Campus Distributed E&G Building EUI

Bi-Monthly Variance Report

Most Recent Two Weeks Steam UsageCampus Average Increase in Steam Usage

Previous Two Weeks Steam Usage

Fault Detection Tools

Pre-Heat Set Point: 50oF Actual Temp: 110oF

Townes Hall AHU-08 BAS Graphic

• Improperly installed and leaking preheat steam valve• Steam costs increased $400 per day due to leak-by steam• If left unaddressed, problem would have resulted in annual utility cost

increases of $140,000• Short term solution: Steam to AHU was valved off• Long term solution: Correct faulty installation of valve stem

Summary of our Investigation

TNH Steam Consumption

Fault Detection ToolsRogue Zone Diagnostics

• Reheat valve is open above 80%

• Space temp is 2oF less than heating set point

• Space temp is 2oF greater than cooling set point

• Damper position is above 95%

Rogue Zone Diagnostics

Rogue Zone Diagnostics

Chill

ed W

ater

(Ton

-Hou

rs)

Date

4/28/20154/28/2014 11/7/2014

Impact of Rogue Zone Program at GDC

• EUI Ranking

• EUI change over year before

• 4 PIM modeling – baseload and controllability

• BAS control level and potential for success

• Service request frequency and maintenance personnel feedback

• Validated Utility Data

EWC EB Commissioning Selection Process

Top 30 EUI Buildings

0

0.05

0.1

0.15

0.2

30 50 70 90 110

Ton-

hrs/

day/

sq-ft

Average Daily Temp

Slope (performance efficiency)Scatter (controllability)

Base load

Pivot Temp 65 degrees

Three Parameter Inverse Modeling, Dr. Kissock, University of Dayton

Example 3 PIM Chilled Water Model

0

0.01

0.02

0.03

0.04

0.05

0.06

0.07

30 40 50 60 70 80 90

Ton-

hr /

Day

/ S

q-ft

Average Daily Temperature

3PIM Chilled Water Campus Averages

Campus Average

Campus Lab Average

Campus Office/Academic Avg

Three Parameter Inverse Modeling, Dr. Kissock, University of Daton

3PIM Chilled Water Campus Average

AHU Resets Supply air temp reset based on zone loads• Air is pretreated by a dedicated OAU with chilled water and hot water/ steam coils• Supply air temperature feedback and set-point in BAS• All zones have room temp feedback in BAS• All zones have terminal box damper feedback in BAS• Return air humidity feedback in BAS• Sensitive areas are evaluated and monitored

Water-Side Resets Hot water supply temperature set-point reset based on outdoor air temperature• Building has a heating hot water loop in place• Supply temperature of hot water loop is tied into the BAS• Outdoor air temperature is available for use in the reset schedule• Hot water pump serves only HVAC loads

BAS Control Level and Potential for Success

1. Baseline Validation –Verify Metering & Billing

2. Reviewing documents• As-builts (Mechanical Schedule,

MEP Drawings)• Sequence of Operations (SOO)• Test and Balance (T&B)• Commissioning Report• Building Automation Systems

(BAS)

GDC Re-Commissioning Process

3. Verify and resolve operational discrepancies • Repaired/ replaced minor equipment – sensors & actuators• Rewrote and reprogrammed vague static pressure reset SOO• Rewrote and reprogrammed outside air flow control• Programmed supply air temperature reset• Corrected inconsistent minimum air flow values

4. Optimize for energy conservation• Optimized supply air and space temperature set-points• Improved supply air temperature reset• Added economizer programming • Added rogue zone programming

GDC Re-Commissioning Process

VAV

HW

Val

ve P

ositi

on %

Date (Day/Hour)

Nov. 6th, 2014 Returned Room Temp Set-point to 70-74F Nov. 7th, 2014

Reduced Air Flow Min.

VAV 3.506 Reheat Valve Position

Nov. 6th, 2014 Demand control ventilation sequence utilizedFa

n Sp

eed

Perc

enta

ge

Date (Day/Hour)

GDC OAU-1 Fan Speed Percentage

10/6/13 – 9/30/14

10/1/14 – 12/9/14

GDC 4 PIM Model After start of EB Cx but before tuning

Generated using Energy Explorer

Temperature (oF)

CW (kBTU/day)

10/6/13 – 9/30/14

12/10/14 – 5/6/15

GDC 4 PIM Model After tuning

Generated using Energy Explorer

Temperature (oF)

CW (kBTU/day)

Chilled Water Electricity Steam Total Measured (10/6/14-5/6/15) Daily Avoidance Annual Estimate46% 5% 51% 37% 173,508.91$ 814.60$ 297,327.48$

Cost Avoidance% Avoidance

BME Re-Commissioning3. Verify and resolve operational discrepancies

• Correct fume hood controller CFM calculation• Add schedule for motion sensors• Adjust motion sensor ultrasonic sensitivity• Correct AHU-3 return air CFM set-point calculation• Replace CO2 sensors and enable demand controlled ventilation

MOOOffset = General Exhaust + Hood Exhaust – Supply Air

BME Motion sensors not fully operational• Design requires that ventilation rates reduce and lights turn off during

unoccupied periods • Programming was partially complete and motion sensors were installed• Ultrasonic sensitivity was not adjusted • Occupancy schedule was not programmed • Located in higher hazard labs and not teaching labs• If utilized, potential energy cost avoidance >$30,000 (ROI < 1 year)

M&V Plan for RBRH• EUI & 3PIM Comparisons

• Against itself at 1, 2, 3, and 5 years from SC• Campus averages• National benchmarks• Energy model

• BAS Trend Comparisons • Against expected operation at 6 to 8 months after SC• Set-up trending in system groups• Use in preparation for enhanced commissioning • Record anomalies and discrepancies

Energy Conservation Measure Trended Point to ReviewAHU static pressure reset Static pressure set point, actual static

pressure, fan speed feedback

AHU supply air temperature reset Supply air temp set-point, actualsupply air temp, relative humidity

AHU set-back schedule Fan speed feedback, valve position

Terminal box set-back Damper position, reheat valve position

Demand Control Ventilation Return air, space, and outside air CO2 value, outside air flow

Economizer Outside air flow, Outside air & return air damper position, CHW valve position, mixed air temperature

Building Automation Trend Review

MOO

The M & V Guided Recommissioning Process

Energy & Water Conservation ProgramSeptember 2015