monitoring based commissioning at csu san marcos

MONITORING BASED COMMISSIONING AT CSU SAN MARCOS

• Campus Overview• State of the Campus - Before MBCx• MBCx – A First Attempt• Lessons Learned• The Second Round – Refining the Process• Persistent Scorecards – with and without• The Final Buildings – Pushing the Envelope

OVERVIEW

• Over 12,000 students currently attend the 304-acre campus

• 1.5 million Sq. Ft. of conditioned space– 960,000 Sq. Ft. on Central Plant

• Master planned for 3 million Sq. Ft. and 25,000 students

• 240 HP Hot Water Plant (previously 640HP)• 2,500 ton chiller plant - Primary variable flow• 16,000 ton hour TES tank

– 80% of Campus CHW Distribution is Most Open Valve• Maxed out – currently accepting donations

CAMPUS OVERVIEW

THE CAMPUS

• Campus Had a Higher BTU/SF Usage Than Other CSU Campuses

• Higher Percentage of Lab Buildings Than Other CSU Campuses

• Kellogg Library Experiment• Flaws of New Building Commissioning at The

Time– Contractor Pays Commissioning Agent– No Proper Air Balancer– Contractors and Project Managers Did Not Take

Recommendations From Campus or Commissioning Agent

STATE OF THE CAMPUS –BEFORE MBCX

Buildings– Kellogg – 3 Years Old– Craven – 15 Years Old– University Hall – 9 Years

Old

Many Measures Identified– Economizers Failed– Sensors Not Calibrated– Valves Leaking By

MBCX – A FIRST ATTEMPT (2007)

• Metering– Installing New Meters and Calibrating Existing

• Data Acquisition– Bandwidth Issues With Energy Management System– Open Source Protocol was Necessary (BACNET)

• Implementation Man Hours/Materials– Invest and Respond Timely

LESSONS LEARNED

RESULTS

21% Energy Reduction$147,000/year in savings2.2 Year Simple Payback*

*After Utility Incentives

THE SECOND ROUND (2010)

Buildings– Academic Hall - 18 Years Old– Science Hall 1 - 18 Years Old – Science Hall 2* - 9Years Old– University Commons - 18Years

Old*Building Originally Not Commissionable

Findings– A Few Valves Leaking By– Sensors Out of Calibration– Supply Air Temperature Resets– Static Pressure Resets

SECOND ROUND RESULTS

14% Energy Reduction$76,141/year in savings1.3 Year Simple Payback*

*After Utility Incentives

Should have won

Best Practices

Award

CONTINUOUS COMMISSIONING – WITH AND WITHOUT

Continuous Commissioning for Buildings• Minimizes drift

• Identifies measures to maintenance staff

• Identifies new energy efficiency measures

• Savings calculations, cost analysis, and simple payback provided to campus when measures are identified

CONTINUOUS COMMISSIONING

CONTINUOUS COMMISSIONING – WITH AND WITHOUT

The Campus had a lapse in continuous commissioning services from June 2012 to July 2013.

During this time period, campus energy usage increased approximately 3% year over year.

THE FINAL BUILDINGS (2013-14) PUSHING THE ENVELOPE

Buildings in Progress– Markstein – 7 Years Old– Arts – 9 Years Old– Central Plant – 5 Years Since

Retrofit

First Observations– Very Few Sensors Out of

Calibration– Economizers are Functioning

Properly– All Units Have Supply Air

Temperature and Static Pressure Resets

PUSHING THE ENVELOPE

What Measures Can Be Implemented

– Demand Control Ventilation with Existing Occupancy Sensors• Included in newest Version of Title

24– Reprogram Resets to Account

for Problem Zones– Duct Sealing– Central Plant Reprogramming