Energy Management at Mayo Clinic - Wild ApricotSolar System Description •462 photovoltaic panels...

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Mayo Clinic and Energy Management

Brett Gorden, Facilities Operations

HEARRT Midwest September 19, 2017


Today’s Discussion

• Mayo Rochester Utilities Overview • Energy production efficiency

• Energy Conservation Program – 2020 Goal • Energy consumption efficiency

• Energy Conservation Projects


Mayo Clinic Locations


Mayo Clinic in Rochester, MN

• 3 Campuses

• Mayo Clinic

• Mayo Clinic Hospital, Saint Marys

• Mayo Clinic Hospital, Methodist

• Integrated medical center providing comprehensive diagnosis & treatment in virtually every medical and surgical specialty

• 34,000 employees

• 21 million square feet


Sustain and re-invest in our mission and extended communities by wisely managing our

human, natural and material resources.

Stewardship


• Mayo Clinic is dedicated to improving the health of its patients & staff through excellence in the practice of medicine

• Recognizing the linkage between environmental health & public health, Mayo is committed to fiscally responsible practices & operations in order to benefit the health of our patients, staff & communities

Environmental Statement


Environmental Statement

• Mayo Clinic exercises a sustainable approach to environmental stewardship, which includes:

• Energy conservation & management

• Employing sustainable facility design, construction & operations strategies

• Practicing environmentally responsible purchasing & waste management


Downtown Campus


Franklin Heating Station


Prospect Utility Plant


Utilities

• Downtown Campus

• 25 buildings served - Approximately 8 million square feet of conditioned space

• Franklin Heating Station built in 1927 in conjunction with the Plummer Building

• Cogeneration for steam and electricity

• Converted to NG in 1932

• Mayo Clinic was instrumental in bringing NG pipeline to Rochester

• Prospect Utility Plant built in 2000


The simultaneous production of two different types of energy during a single process!


STEAM

CONVENTIONAL

STEAM TURBINE

GENERATOR

CO-GENERATING

STEAM TURBINE

GEN BOILER STEAM

TURBINE

Exhaust steam goes to

condenser (wasted energy)

STEAM

GEN BOILER STEAM

TURBINE


FHS - Co-gen Turbines #1 and #2


FHS - Co-gen Turbine #3


10lb STEAM - CHILLER #12


Saint Marys Campus


Utilities

• Saint Marys Hospital

• Serves 3.5 million sf Hospital

• Steam, Electricity, and CHW

• Power Plant built in 1912

• Cogeneration to produce steam, electricity, and chilled water

• Generates about 84% of total annual electrical consumption


Uses heat in the combustion turbine generator exhaust to create steam.


CONVENTIONAL

ENGINE

GENERATOR

ENGINE GENERATOR

WITH HEAT

RECOVERY BOILER

COMBUSTION

TURBINE GEN

Natural Gas

EXHAUST

Exhaust is very hot air that leaves the engine

COMBUSTION

TURBINE GEN

Natural Gas

BOILER

EXHAUST

STEAM

Exhaust is pushed through a boiler

to heat water into steam before it leaves

through the stack


COMBUSTION TURBINE HRSG

SMC - Combustion Turbine


Energy Conservation

• Leadership announces 20% reduction goal in 2011

• Reduce EUI by 20% by 2020

• Made energy conservation a priority

• Retro commissioning would be the primary tool


Engagement of Facilities Staff

• The Maintenance staff is crucial to the performance of the building systems

• Knowledge of the buildings and systems

• The 2020 goal empowered the maintenance staff to find and correct inefficiencies

• Scheduling HVAC equipment

• Variable Frequency Drives

• Lighting retrofits and lighting controls

• Building Automation Programming

• Duct Sealing


Retro commissioning

• Definition – systematic process to improve an existing building's performance. Using a whole-building systems approach, retro commissioning seeks to identify operational improvements that will increase occupant comfort and save energy.


Retro commissioning Process

Large Buildings

• > 200,000 sq. ft.

• KBTU/s.f. > 200

• Consultant Led

• Facilities Operations supported

Small buildings

• < 200,000 sq. ft.

• KBTU/s.f. < 200

• Facilities Operations Led

• Consultant Supported


Retro commissioning – Activities

• Equipment Scheduling

• Controls programming

• System operation and design

• Exhaust adjustments

• Variable Frequency motor drive

• ECM motors

• Pump control

• Chiller control

• Air flow adjustment


Retro commissioning - Summary

• 2011-2016 Costs = $1,508,351

• Rebates = $888,597 • LED fixtures

• LED bulbs

• Energy projects – Custom Rebates

• Variable frequency drives





Progress

240,000.0

250,000.0

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290,000.0

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320,000.0

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Rochester Energy Use Intensity Quarterly

EUI

16% Reduction from

Baseline


Measuring and Monitoring

• Spreadsheets

• Energy Star

• provides easily accessible database.

• Provides reporting tools and goal setting features

• Real-Time energy monitoring

• Captures many more data points

• Drill down to analyze performance

• Energy Dashboards








Energy Conservation Projects


Renewable Energy


Damon Parking Ramp Solar Panels

• Installation complete: September 2010

• System Size: 145.5 KW

• Over 896,000 KWH Generated to date

• 643 Tons of CO2 Saved


Solar System Description

• 462 photovoltaic panels • Each panel

• 96 cells

• Rated at 315 watts

• Total Peak rated output – 145.5 KW

• Estimated annual energy – 150,000 KWH • Equivalent to energy for 15 homes


Web-Based Monitoring


Damon Parking Ramp Energy Projects

• Solar installation – 2010

• Lighting controls – 2012

• Regenerative elevator drives – 2013

• LED ramp lighting fixtures - 2013

Damon Ramp regenerative elevator drives consume 60 % less electricity then previous drives.


Parking Ramp LED Retrofits

• Completed Seven Ramp Retrofits since 2012

• Approximately 2.4 million GSF of Ramps Converted

• Over 1,500,000 kwh annual savings


Graham Ramp LED Retrofit (2016)

• Replaced 100W High Pressure Sodium Fixtures

• Installed 34W LED Fixtures

• Programmed New Lighting Controls

• Annual Savings = 631,000 KWH • Average MN Household consumes 9144 KWH/year

• U.S. Energy Information Administration: https://www.eia.gov/tools/faqs/faq.cfm?id=97&t=3

• 3 year Simple Payback

https://www.eia.gov/tools/faqs/faq.cfm?id=97&t=3


Graham Ramp LED Retrofit (Before)


Graham Ramp LED Retrofit (After)


Graham Ramp LED Retrofit (Before)


Graham Ramp LED Retrofit (After)


WEST EMPLOYEE

RAMP

LED light conversion

Completed: May 2015

LED Conversion

High Pressure Sodium lights.

BENEFITS • Increased light levels • Safer environment • Reduced energy use • 480,000 KWH/YR


West Employee Ramp – LED Lights


Before LED After LED

Technology Drive – Surface Lot LED

Before After


DUCT SEALING


Duct Leakage Creates Substantial Energy Losses.

Facilities has

initiated a duct

sealing program.

Dust from air leaks

The duct

sealing process

reduces leakage

by 95%.


Duct

Sealing

Equipment


One Cubic

Foot a

Minute cost

$3.50 to

produce

annually.

An annual savings of

$162,000


Greener Labs - Energy

• Turn off lights when not in use

• Turn off equipment at the end of the day

• Purchase Energy Star® equipment and enable energy savings features where possible

• Maximize use of freezers

• Follow proper fume hood operating procedures - close the sash and turn off the light when not in use


Fume Hoods

• Clinical & Research Labs

• 400 hoods - Rochester

• 29 hoods - Arizona

• 21 hoods - Florida

• Large energy consumer

• 100% outside makeup air

• Costs up to $5/CFM/year

• 6 ft constant volume fume hood exhausts up to 800 CFM = $4,000/year!

• On-site surveys show 30-50% of hoods left on & open overnight


Fume Hoods


• Retrofit hoods with airflow controls & hood monitors

• Fume Hood stickers to improve sash management

• Replace hoods with energy efficient models

Fume Hoods


Fume Hoods

• New controls will maintain safe airflow with sash open or closed.

• No need to “turn on” the hood.


Miscellaneous Exhaust

• Exhaust devices other than fume hoods

• Snorkels

• Canopy Hoods

• Custom Hoods

• Up to $5/cfm/year for exhaust devices running 24 hours/day

• Turn off when not in use.


Miscellaneous Exhaust

• Determine which exhaust devices are necessary to remain operating continuously.

• Controls can be added to turn exhaust off during unoccupied times.


High Value Opportunities

• Fume Hood controls

• Duct Sealing

• Operating room HVAC scheduling

• Kitchen Hood Controls

• Complete Retro commissioning Plan

• New construction: EUI Targets

• Employee engagement: Dashboards


Conclusion

• Long Tradition of Stewardship

• Important For Leadership to Set the Goal

• Continual Process

• Retro commissioning

• Energy Projects

• Track Performance

• Analyze and Adjust as needed


Thank You


ECM

MOTORS


A 2013 project to replace 221 evaporator motors

with a new energy efficient electronically

commutated motor/fan assembly on walk-in

coolers is complete.

• Project cost $60,000

• Annual energy savings $28,600

• Rebates $9,330


EXHAUST


A project to replace the

exhaust fans in the Medical

Science building is complete.

Original line of

45 exhaust fans


New energy efficient

exhaust system

New heat recovery system

Annual savings

estimated at $70,000

Medical Science

New AHU Exhaust

Plenum

Heat

Recovery coil

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