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Energy Conservation Measures

In this section of the document we will define the Energy Conservation Measures we have
evaluated for this project. Then we will define the measures on a building by building basis.
Careful consideration was given to each measure and its interaction withthe overall building
performance.

General ECM Descriptions
Nashua North High School

ECM 1 - LED Lighting

The schools currently utilize a combination of T8 and T5 fluorescent lighting. EEI proposes
replacing the existing fixtures with new LED lighting. EEI performed a detailed survey of the
interior and exterior spaces in order to identify opportunities in which we can improve
lighting quality, reduce maintenance costs, and save energy.

The existing lighting demand (kW) per fixture, hours of operation, fixture quantities, and
recommended retrofits are based on the physical inspection and site visits conducted by EEI
in 2019. As a result of the survey and analysis, EEI has developed a high efficiency lighting
upgrade project that will provide the schools listed with new LED fixtures with controls,
resulting in guaranteed annual energy savings and a reduction in electrical demand.

LED type lighting provides significant illumination, has longer life expectancy, increased
savings in electric consumption, and provides dimming capabilities. Also, standardizing all
fixtures will reduce future maintenance requirements.

LED fixtures in a school environment have an estimated life of more than 20 years. There is
significant maintenance savings when LED fixtures are used due to their longer lifespan.

All light energy eventually converts to heat. The conversion to higher efficiency LED fixtures
will reduce the building’s lighting energy intensity (kW/sq.ft), therefore impacting the HVAC
heating and cooling loads. Converting to LED lighting will eliminate 2,799 mmBTU waste
heat annually. The reduction in lighting waste heat will increase the HVAC load during
heating season, approximately 11,983 therms annually. Conversely, the HVAC load will
decrease in the cooling season, approximately 55,925 kWh annually. The net HVAC utility
impact is an increase in cost of approximately $3,594. This increase in cost has been
subtracted fromthe energy savings for the ECM. Please see below forthe formulas used to
calculate the net savings affect.

HVAC Heating Load Increase = (Net Annual Interior LED Lighting kWh Savings * Btu
Conversion Factor * Therm Conversion Factor* % of Time HVAC Systemis Heating * Utility
Rate per Therm) / (Heating System Efficiency)

HVAC Cooling Load Decrease = Net Annual Interior LED Lighting kWh Savings * Btu
Conversion Factor * Cooling Tons Conversion Factor * % of Time HVAC Systemis Cooling *
Cooling System Efficiency * Utility Rate per kWh

Assumptions:
o Net Annual Interior LED Lighting kWh Savings = 820,956 kWh

o % of time HVAC Systemis Heating = 3000 hours / 8760 hours = 35%
o % of time HVAC Systemis Cooling = 3000 hours / 8760 hours = 35%
o Heating SystemEfficiency = 80%
o Cooling System Efficiency = .7 kW/ton
o Utility Rate per Therm = $1.00/therm
o Utility Rate per kWh = $.15/kWh

Scope of Work:

Install (2,953) LED 2x4 and 2x4 retrofit fixtures with Spacewise control and wireless
dimming capability

Install (271) LED high bay fixtures with Spacewise control and wireless dimming capability
Install (461) LED recessed can fixtures

Install (2,310) LED tubes and (1,350) LED drivers

Install (139) LED lamps

Install (180) LED round decorative fixtures

ECM 2 —- Controls Upgrade

EEI proposes installing a complete DDC system as an extension of the existing N4
Enterprise Supervisor.

Scope of work:

e Demo the existing VAV controllers, keeping the existing communication wiring
operational for the existing controllers.

e New BACnet IP DDC controllers, new space sensors with CO2, and new discharge
air sensors. Reuse existing control valves. Provide programming to reduce
minimum airflow when space temperature and CO2 levels are satisfied.

e Assistance in displaying building analytics software. Review analytics reports with
the team and retro-commission systems to remedy problem zones. Repeat this
monthly to fine tune the building HVAC systems.

e Assistance to the balancing contractor to calibrate VAVs, airflow stations, and
AHUs.

e Network controller hardware and software updates as needed.

ECM 3 -— Weatherization

EEI completed a detailed building audit. Suspected air leakage locations were verified
and opportunities to improve building performance and save energy were found. Air
leakage is caused by pressure differences subject to variations in wind velocity and
HVAC systems. In order to control heating and cooling loads, and allow the mechanical
systems to operate effectively, pressure differences from the outdoor environment to
the indoor building spaces must be controlled. The best way to do this is by tightening
the building envelope through insulating and air sealing. This will extend the life cycle
of the building by protecting it from the elements and minimizing moisture carried by
air which penetrates the building. Also, insulation and air sealing increases thermal
performance of the building and the comfort, health and safety of the building
occupants.

Scope of work:

Inspect exterior doors for deficiencies to the weather stripping and door sweeps. Install
new weather stripping and door sweeps as needed.

ECM 4 - Transformers

EEI evaluated the electrical systems of the s chool buildings and determined that the
existing transformers at Nashua North High School are standard efficiency models that
are not designed to handle the loads of modern facilities. The most common efficiency
for commercial and industrial transformers supplying linear loads in the 30-150 kVA
range is 95%, as compared to 98% for a high efficiency model. Further, conventional
transformer losses, which are non-linear, increase by 2.7 times when _ feeding
computer loads.

EEI recommends the replacement of existing inefficient transformers in order to improve
the energy efficiency ofthe electricaldistribution systems through the replacement
of the transformers with new high efficiency units. The scope of work for this measure
would include upgrading:

32 Transformers

(5) 15 kVA
(4) 30 kVA
(2) 45 kVA
(1) 75 kVA
(6) 112.5 kVA
(1) 145 kVA
(1) 150 kVA
(1) 175 kVA
(3) 220 kVA
(4) 225 kVA
(2) 300 kVA
(2) 500 kVA

ECM 5 -— Retro Commissioning

This is an allowance for an engineering and maintenance team to install, repair, and
replace any damaged existing to remain equipment. Existing AHUs will include software
revisions to reduce energy consumption. Includes 5 years of analytics reports.

ECM 6 — Mini Splits
EEI proposes removing the (19) existing Mitsubishi ductless splits.

Furnish and install (19) new Mitsubishi condensing units of the same capacity of the
existing system. Counts are as follows: (7) 1-tonceiling cassette systems, (3) 1.5-ton
ceiling cassette systems, (1) 2-tonceiling cassette system. (1) 1-ton wall mounted
system, (6) 1.5-ton wall systems, (1) 2-ton wall mounted system. New units will be
furnished with wind baffles for low ambient cooling and new wall mounted thermostats.

ECM 7 — Condensing Hot Water

The current water heating units are standard efficiency. This measure would be to
replace the current system with high efficiency condensing Lochinvar units Armor Floor
Mounted units with 98% efficiency. The units have a 5:1 turndown with stainless steel
heat exchanger. Scope to include new ASME storage tanks, expansion tanks, and
circulation pumps.

ECM 8 - Targeted Balancing

EEI proposes targeted balancing of the existing ventilation systems. When ventilation
units are over-ventilating it causes unnecessary conditioning of outside air. This
measure would include checking the air flow at the diffusers to ensure that it meets
current code required flow.

ECM 9 - Kitchen Hood

The existing kitchen exhaust systemhas a basic on/off operation. This results in the system
operating during times when it doesn’t need to be operating and conditioned air is
exhausted. This measure is for installing a Captive Aire unit with VFD drives on make-up air
and exhaust fans. A temperature sensor will be installed in the duct work and control
operation based on the temperature inside the duct.

ECM 10 - Walk In Coolers

EEI recommends refrigeration controllers on walk-in coolers and freezers as wellas
installing electronically commutated (EC) motors on evaporator fans. A controller can
start/stop the evaporator fans when operation is unnecessary. The EC motors are 30%

more efficient thanthe standard two-pole motors. Energy savings will be realized by
reducing the runtime of the compressors and evaporator fans in addition to the reductionin
power load of the new fans. Each walk-in cooler or freezer will have a new EC fan motor and
blade installed as wellas a dedicated controller. In addition, controllers will be installed on
the freezer to optimize the operation of the electric defroster and door heater. Thecontroller
unit senses when refrigerant has ceased flowing through the evaporator coil and controls
the fan motors. Door and frame heaters are controlled based on dew point, reducing their
run time by 95% in coolers and 60% in freezers. The controllers will reduce compressor and
evaporator runtime by up to 10%.

Calculations

Energy savings will result from both reducing the fan power and the efficient control of the
evaporator fans and door heaters. In general, EEI uses the following approach to determine
savings for this specific measure:

Cost of Existing Equipment = Existing kW x Cost per kWh x Existing Effective Full Load
Hours

Cost of Proposed Equipment Energy Savings = Existing kW x Cost per kWh x Full Load
Hours Using Control

Savings = Existing Equipment Costs- Proposed Equipment Costs

10

Board of Aldermen - Organizational Mtg. - 1/10/16 Page 2
Seat # 4 Alderman-at-Large Mark S. Cookson
Seat #5 Alderman Richard A. Dowd

Seat #6 Alderman June M. Caron

Seat # 7 Alderman Ken Siegel

Seat # 8 Alderman David Schoneman

Seat #9 Alderwoman Mary Ann Melizzi-Golja
Seat # 10 Alderman Sean M. McGuiness

Seat # 11 Alderman Don LeBrun

Seat # 12 Alderman-at-Large Daniel T. Moriarty
Seat # 13 Alderman-at-Large Michael B. Obrien, Sr.

Seat # 14 Alderman Tom Lopez

President McCarthy called for Nominations for three members of the Board of Health for 2016-2017

ALDERWOMAN MELIZZI-GOLJA NOMINATED DR. ANTHONY STORACE, DR. CHARLES T. CAPPETTA,
AND DR. THOMAS ASTOLFI AS MEMBERS OF THE BOARD OF HEALTH FOR THE ENSUING TWO
YEARS

Hearing no additional nominations, President McCarthy declared the nominations closed.

VOTE ON ELECTION OF DR. ANTHONY STORACE, DR. CHARLES T. CAPPETTA, AND DR. THOMAS
ASTOLFI AS MEMBERS OF THE BOARD OF HEALTH FOR THE ENSUING TWO YEARS BY VOICE VOTE
MOTION CARRIED

President McCarthy declared Drs. Storace, Cappetta and Astolfi duly elected as members of the Board of
Health for the ensuing two years.

President McCarthy presented his Committee Assignments to the members of the Board of Aldermen.

ALDERMAN WILSHIRE MOVED THAT THE COMMITTEE ASSIGNMENTS BY THE PRESIDENT OF THE
BOARD OF ALDERMEN BE ACCEPTED BY VOICE VOTE
MOTION CARRIED

REMARKS BY THE PRESIDENT OF THE BOARD OF ALDERMEN

President McCarthy

Alderman Deane, would you please come up to the podium? | want to thank you for your service as President
of the Board of Aldermen in the past term. | know a lot about that position including how uncomfortable that
stupid stool is and | want to thank you for putting up with it. I’ve Known you for 25 years almost and | want to
thank you for your commitment to the City of Nashua as it’s exemplary and I’d like to present to you on behalf
of the Board of Aldermen with a token of ours.

Nashua South High School

ECM 1 - LED Lighting

The schools currently utilize a combination of T8 and T5 fluorescent lighting. EEI proposes
replacing the existing fixtures with new LED lighting. EEI performed a detailed survey of the
interior and exterior spaces in order to identify opportunities in which we can improve
lighting quality, reduce maintenance costs, and save energy.

The existing lighting demand (kW) per fixture, hours of operation, fixture quantities, and
recommended retrofits are based on the physical inspection and site visits conducted by EEI
in 2019. As a result of the survey and analysis, EEI has developed a high efficiency lighting
upgrade project that will provide the schools listed with new LED fixtures with controls,
resulting in guaranteed annual energy savings and a reduction in electrical demand.

LED type lighting provides significant illumination, has longer life expectancy, increased
savings in electric consumption, and provides dimming capabilities. Also, standardizing all
fixtures will reduce future maintenance requirements.

LED fixtures in a school environment have an estimated life of more than 20 years. There is
significant maintenance savings when LED fixtures are used due to their longer lifespan.

All light energy eventually converts to heat. The conversion to LED fixtures will reduce the
building’s lighting energy intensity (kW/sq. ft), therefore impacting the HVAC heating and
cooling loads. Converting to LED lighting will eliminate 2,795 mmBTU waste heat annually.
The reduction in lighting waste heat will increase the HVAC load during heating season,
approximately 11,967 therms annually. Conversely, the HVAC load will decreasein the
cooling season, approximately 55,849 kWh annually. The net HVAC utility impact is an
increase in cost of approximately $3,589. This increase in cost has been subtracted fromthe
energy savings for the ECM. Please see below for the formulas used to calculate the net
savings affect.

HVAC Heating Load Increase = (Net Annual Interior LED Lighting kWh Savings * Btu
Conversion Factor * Therm Conversion Factor* % of Time HVAC Systemis Heating * Utility
Rate per Therm) / (Heating System Efficiency)

HVAC Cooling Load Decrease = Net Annual Interior LED Lighting kWh Savings * Btu
Conversion Factor * Cooling Tons Conversion Factor * % of Time HVAC Systemis Cooling *
Cooling System Efficiency * Utility Rate per kWh

Assumptions:
o Net Annual Interior LED Lighting kWh Savings = 819,850 kWh
% of time HVAC Systemis Heating = 3000 hours / 8760 hours = 35%
% of time HVAC Systemis Cooling = 3000 hours / 8760 hours = 35%
Heating System Efficiency = 80%
Cooling System Efficiency = .7 kW/ton
Utility Rate per Therm = $1.00/therm
Utility Rate per kWh = $.15/kWh

oO0000 0

11

Scope of Work:

Install (3,860) LED 2x4 and 2x4 retrofit fixtures with Spacewise control and wireless
dimming capability

Install (260) LED high bay fixtures with Spacewise control and wireless dimming capability
Install (642) LED recessed can fixtures

Install (2,947) LED tubes and (1,644) LED drivers

Install (193) LED lamps

Install (47) LED round decorative fixtures

ECM 2 —- Controls Upgrade

EEI proposes installing a complete DDC system as an extension of the existing N4
Enterprise Supervisor.

Scope of work:

e Demo the existing VAV controllers, keeping the existing communication wiring
operational for the existing controllers.

e New BACnet IP DDC controllers, new space sensors with CO2, and new discharge
air sensors. Reuse existing control valves. Provide programming to reduce
minimum airflow when space temperature and CO2 levels are satisfied.

e Assistance in displaying building analytics software. Review analytics reports with
the team and retro-commission systems to remedy problem zones. Repeat this
monthly to fine tune the building HVAC systems.

e Assistance to the balancing contractor to calibrate VAVs, airflow stations, and
AHUs.

e Network controller hardware and software updates as needed.

ECM 3 -— Weatherization

EEI completed a detailed building audit. Suspected air leakage locations were verified
and opportunities to improve building performance and save energy were found. Air
leakage is caused by pressure differences subject to variations in wind velocity and
HVAC systems. In order to control heating and cooling loads, and allow the mechanical
systems to operate effectively, pressure differences from the outdoor environment to
the indoor building spaces must be controlled. The best way to do this is by tightening
the building envelope through insulating and air sealing. This will extend the life cycle
of the building by protecting it from the elements and minimizing moisture carried by
air which penetrates the building. Also, insulation and air sealing increases thermal
performance of the building and the comfort, health and safety of the building
occupants.

Scope of work:

Inspect exterior doors for deficiencies to the weather stripping and door sweeps. Install
new weather stripping and door sweeps as needed.

ECM 4 - Transformers

EEI evaluated the electrical systems of the s chool buildings and determined that the
existing transformers at Nashua South High School are standard efficiency models that
are not designed to handle the loads of modern facilities. The most common efficiency

12

for commercial and industrial transformers supplying linear loads in the 30-150 kVA
range is 95%, as compared to 98% for a high efficiency model. Further, conventional
transformer losses, which are non-linear, increase by 2.7 times when _ feeding
computer loads.

EEI recommends the replacement of existing inefficient transformers in order to improve
the energy efficiency ofthe electricaldistribution systems through the replacement
of the transformers with new high efficiency units. The scope of work for this measure
would include:

30 Transformers

(6) 15 kVA
(2) 45 kVA
(2) 75 kVA
(8) 112.5 kVA
(3) 150 kVA
(5) 220 kVA
(1) 225 kVA
(2) 300 kVA
(1) 400 kVA

ECM 5 -— Retro Commissioning

This is an allowance for an engineering and maintenance team to install, repair, and
replace any damaged existing to remain equipment. Existing AHUs will include software
revisions to reduce energy consumption. Includes 5 years of analytics reports.

ECM 6 — Mini Splits
EEI proposes removing the (16) existing Mitsubishi ductless splits.

Furnish and install (16) new Mitsubishi condensing units of the same capacity of the
existing system. Counts are as follows: (4) 1-tonceiling cassette systems, (7) 1.5-ton
ceiling cassette systems, (1) 2-tonceiling Cassette system, (1) 1 ton wall mounted
system, (2) 1.5 ton wall systems, (1) 3.5 ton under ceiling system. New units will be
furnished with wind baffles for low ambient cooling and new wall mounted thermostats

Furnish and install (1) York cooling only system, 3.5-ton cooling
ECM 7 — Condensing Hot Water

The current water heating units are standard efficiency. This measure would be to
replace the current system with high efficiency condensing Lochinvar units Armor Floor
Mounted units with 98% efficiency. The units have a 5:1 turndown with stainless steel
heat exchanger. Scope to include new ASME storage tanks, expansion tanks, and
circulation pumps.

ECM 8 - Targeted Balancing

EEI proposes targeted balancing of the existing ventilation systems. When ventilation
units are over-ventilating it causes unnecessary conditioning of outside air. This

13

measure would include checking the air flow at the diffusers to ensure that it meets
current code required flow.

ECM 9- Kitchen Hood

The existing kitchen exhaust systemhas a basic on/off operation. This results in the system
operating during times when it doesn’t need to be operating and conditioned air is
exhausted. This measure is for installing a Captive Aire unit with VFD drives on make-up air
and exhaust fans. A temperature sensor will be installed in the duct work and control
operation based on the temperature inside the duct.

ECM 10- Walk In Coolers

EEI recommends refrigeration controllers on walk-in coolers and freezers as wellas
installing electronically commutated (EC) motors on evaporator fans. A controller can
start/stop the evaporator fans when operation is unnecessary. The EC motors are 30%

more efficient thanthe standard two-pole motors. Energy savings will be realized by
reducing the runtime of the compressors and evaporator fans in addition to the reductionin
power load of the new fans. Each walk-in cooler or freezer will have a new EC fan motor and
blade installed as wellas a dedicated controller. In addition, controllers will be installed on
the freezer to optimize the operation of the electric defroster and door heater. The controller
unit senses when refrigerant has ceased flowing through the evaporator coil and controls
the fan motors. Door and frame heaters are controlled based on dew point, reducing their
run time by 95% in coolers and 60% in freezers. The controllers will reduce compressor and
evaporator runtime by up to 10%.

Calculations

Energy savings will result from both reducing the fan power and the efficient control of the
evaporator fans and door heaters. In general, EEI uses the following approach to determine
savings for this specific measure:

Cost of Existing Equipment = Existing kW x Cost per kWh x Existing Effective Full Load
Hours

Cost of Proposed Equipment Energy Savings = Existing kW x Cost per kWh x Full Load
Hours Using Control

Savings = Existing Equipment Costs- Proposed Equipment Costs

14

Attachment 2 - Maintenance and Service Agreements

To ensure the guarantee School District must maintain equipment as required by
Operational and Maintenance Manuals / Manufacturer Recommendations of all
equipment provided under this contract.

For the measures that are guaranteed under IMPVP Option C, we have a reporting
and continuous monitoring process that involves the District’s current EMS System.
EEl has integrated our Analytics Software with the current EMS from which we
extract monthly data from the system for analysis. This information is used to
monitor system use and for the M&V of the Option C Measures. It is vitally
important to this process that the EMS be maintained and kept in proper working
order at all times. Changes to the EMS software may require updates and
modifications to our M&V Process. Changes to the EMS may adversely impact
energy and operational savings.

The form below is EEl’s M&V Continuing Services Agreement that starts at the
conclusion of the Warranty Period. First year M&V Service is covered under the
contract concurrent with the 1 year warranty.

Also included in this contract are years 2 through 5 M&V Continuing Services as
identified in the Contract Schedule of Values defined below. This M&V Continuing
Services agreement is a separate and distinct contract from any service contract
the District may have with the EMS Vendor or other service providers. During the
course of monitoring the systems if repairs and or replacement of system
components are identified the cost for those repairs will be extra to this agreement.

To extend the M&V Continuing Service Contract beyond that established in this
agreement (past 5 years) the District must sign the attached M&V Continuing
Service Contract and return to EEI prior to the expiration of the limit the cost
included in the construction project.

Form Contract -M&V Continuing Services Agreement

ESCO Contract — Nashua Schools & EEI, Inc 11/22/2019