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ENERGY EFFICIENT INVESTMENTS INC.

ECM: Nashua South High School

M&V Option Used

1. LED Lighting Option A
2. Controls Upgrade Option C
3. Weatherization Option C
4, Transformers Option B
5, Retro-Commissioning Option C
6. Mini Splits Option B
7, Condensing Hot Water Option A
8. Targeted Balancing Option A
9. Kitchen Hood Option B
10, Walk In Coolers Option B

In this section of the document we will define the Energy Conservation Measures we have evaluated
for this project and how each M&V option will be implemented. Careful consideration was given to
each measure and its interaction with the overall building performance.

We have standard categories that we use for defining measures, from the standard categories we then
apply specifics to each buildmg and measure. General ECMs typically do not help Customers and
Consultants determine which measures should be implemented. This is why we attempt to be as
specific as possible. With the specificity, we are better able to estimate the implementation cost of

the measure.

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ENERGY EFFICIENT INVESTMENTS INC.

Nashua North High School

ECM 1- LED Lighting

The schools currently utilize a combination of T8 and TS 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 2018. 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, by 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 2,963 mmBTU waste heat annually. The reduction in lighting
waste heat will increase the HVAC load during heating season, approximately 12,685 therms annually.
Conversely, the HVAC load will decrease in the cooling system, approximately 59,198 kWh annually. The
net HVAC utility impact is an increase in cost of approximately $3,805. This increase in cost has been
subtracted from the energy savings for the ECM.

The following fixture types are to be installed:

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

IPMVP Option A, Retrofit Isolation with Key Parameter Measurement, has been chosen for this ECM. This
option has been chosen because the only parameter changing in the implementation of this ECM is the
fixture input wattage. EEI will use current transducers to measure a 20% sample of the fixture input wattage
before and after ECM implementation.

ECM 2- Controls Upgrade

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ENERGY EFFICIENT INVESTMENTS INC.

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

Scope of work:

Demo the existing VAV controllers, keeping the existing communication wiring operational for the
existing controllers. Install new BACnet IP DDC controllers, new space sensors, and new discharge air
sensors. Install network controller hardware and software updates as needed.

IPMVP Option C, Utility Data Analysis of Whole Building, has been chosen for this ECM. This option
has been chosen because the wide ranging effects of a controls system on building energy performance
does not lend itself to isolation measurement. EEI has established the building baseline energy usage
using utility data, see “Baseline Development and Performance Period” section. The building energy
usage will continue to be recorded after the ECM implementation and compared to the baseline to
determine savings. The savings guarantee is contingent on several buildmg operations factors described
in the Conditional Savings Guarantee section later in this report.

ECM 3-— Weatherization

EEI completed a detailed building audit and verified suspected air leakage locations and found
opportunity to improve building performance and save energy. 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 door 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.

IPMVP Option C, Utility Data Analysis of Whole Building, has been chosen for this ECM. This option
has been chosen because the wide ranging effects of weatherization on building energy performance
does not lend itself to isolation measurement. EEI has established the building baseline energy usage
using utility data, see “Baseline Development and Performance Period” section. The building energy
usage will continue to be recorded after the ECM implementation and compared to the baseline to
determine savings. The savings guarantee is contingent on several buildmg operations factors described
in the Conditional Savings Guarantee section later in this report.

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 and 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. Also, if transformers are not properly vented to the exterior, their
heat output adds to the building cooling load.

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ENERGY EFFICIENT INVESTMENTS INC.

EEI recommends the replacement of existing efficient transformers in order to improve the energy
efficiency of the electrical distribution 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) ISKVA
(4) 30 kVA
(2) 45 kVA
(1) 75 kVA
(6) 112.5 kVA
(1) 145kVA
(1) 150kVA
(1) 175 kVA
(3) 220 kVA
(4) 225 kVA
(2) 300 kVA
(2) 500 kVA

IPMVP Option B, Retrofit Isolation with All Parameter Measurement, has been chosen for this ECM. This
option has been chosen because the only parameters changing in the implementation of this ECM are the
transformer losses. EEI will use current transducers to measure the losses for each transformer over a one
month period to obtain a representative transformer loading profile.

ECM 5- Retro Commissioning

This is an allowance for an engineerig 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.

IPMVP Option C, Utility Data Analysis of Whole Building, has been chosen for this ECM. This option
has been chosen because the wide ranging effects of Retro Commissioning on building energy
performance does not lend itself to isolation measurement. EEI has established the building baseline
energy usage using utility data, see “Baseline Development and Performance Period” section. The
building energy usage will continue to be recorded after the ECM implementation and compared to the
baseline to determine savings. The savings guarantee is contingent on several building operations
factors described in the Conditional Savings Guarantee section later in this report.

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ENERGY EFFICIENT INVESTMENTS INC.

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-ton ceiling cassette systems, (3) 1.5-ton ceiling cassette systems, (1) 2-ton
ceiling 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.

IPMVP Option B, Retrofit Isolation with All Parameter Measurement, has been chosen for this ECM. This
option has been chosen because the only parameter changing in the implementation of this ECM is the mini
split Energy Efficiency Ratio (EER). EET will use current transducers to measure the EER for a 20% sample
of the mini splits over a one month period to obtain a representative loading profile.

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.

IPMVP Option A, Retrofit Isolation with Key Parameter Measurement, has been chosen for this ECM. This
option has been chosen because the only parameter changing in the implementation of this ECM is the
combustion efficiency. EEI will use a flue gas analyzer to measure each water heater efficiency before and
after ECM implementation.

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.

IPMVP Option A, Retrofit Isolation with Key Parameter Measurement, has been chosen for this ECM. This
option has been chosen because the only parameter changing in the implementation of this ECM is the
airflow amount. EEI will use airflow hoods to measure a 20% sample of diffuser airflow cfm before and after
ECM implementation.

ECM 9- kitchen Hood

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

IPMVP Option B, Retrofit Isolation with All Parameter Measurement, has been chosen for this ECM. This
option has been chosen because the only parameter changing in the implementation of this ECM is the
kitchen hood exhaust fan speeds. EEI will use Energy Management System (EMS) trending data over a one
month period to obtain a representative loading profile.

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ENERGY EFFICIENT INVESTMENTS INC.

ECM 10- Walk In Coolers

EEI recommends refngeration controllers on walk-in coolers and freezers and 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 than the standard two-pole motors. Energy savings
will be realized by reducing the runtime of the compressors and evaporator fans as well as the reduction in
power load of the new fans. Each walk-in cooler or freezer will have a new EC fan motor and blade installed
as well as 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 refngerant 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:

Existing kW Cost per kWh
Cost of Existing Equipment

Cost of Proposed Equipment Energy Savings

Listed Equipment Amperage x Voltage of Equipment Average Site Data Package $/kWh
= Existing kW x Cost per kWh x Effective Full Load Hours

= Existing kW x Cost per kWh x Full Load Hours Using Control

= Existing Equipment Costs- Proposed Equipment Costs

IPMVP Option B, Retrofit Isolation with All Parameter Measurement, has been chosen for this ECM. This
option has been chosen because the only parameters changing in the implementation of this ECM are the
evaporator fan power and run time hours, the condensing unit run time hours, and the door heater run time
hours. EEI will use current transducers to measure each parameter over a one month period to obtain a
representative loading profile.

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ENERGY EFFICIENT INVESTMENTS INC.

Nashua South High School

ECM 1- LED Lighting

The schools currently utilize a combination of T8 and TS 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 2018. 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, by 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 3,270 mmBTU waste heat annually. The reduction in lighting waste heat will
increase the HVAC load during heating season, approximately 13,998 therms annually. Conversely, the
HVAC load will decrease in the cooling system, approximately 65,325 kWh annually. The net HVAC utility
impact is an increase in cost of approximately $4,199. This increase in cost has been subtracted from the
energy savings for the ECM.

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

IPMVP Option A, Retrofit Isolation with Key Parameter Measurement, has been chosen for this ECM. This
option has been chosen because the only parameter changing in the implementation of this ECM is the
fixture input wattage. EEI will use current transducers to measure a20% sample of the fixture input wattage
before and after ECM implementation.

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ENERGY EFFICIENT INVESTMENTS INC.

ECM 2- Controls Upgrade

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

Scope of work:

Demo the existing VAV controllers, keeping the existing communication wiring operational for the
existing controllers. Install new BACnet IP DDC controllers, new space sensors, and new discharge air
sensors. Install network controller hardware and software updates as needed.

IPMVP Option C, Utility Data Analysis of Whole Building, has been chosen for this ECM. This option
has been chosen because the wide ranging effects of a controls system on building energy performance
does not lend itself to isolation measurement. EEI has established the building baseline energy usage
using utility data, see “Baseline Development and Performance Period” section. The building energy
usage will continue to be recorded after the ECM implementation and compared to the baseline to
determine savings. The savings guarantee is contingent on several buildmg operations factors described
in the Conditional Savings Guarantee section later in this report.

ECM 3-— Weatherization

EEI completed a detailed building audit and verified suspected air leakage locations and found
opportunity to improve building performance and save energy. 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 door building spaces must be controlled. The best way to do this is by
tightening the building envelope by 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.

IPMVP Option C, Utility Data Analysis of Whole Building, has been chosen for this ECM. This option
has been chosen because the wide ranging effects of weatherization on building energy performance
does not lend itself to isolation measurement. EEI has established the building baseline energy usage
using utility data, see “Baseline Development and Performance Period” section. The building energy
usage will continue to be recorded after the ECM implementation and compared to the baseline to
determine savings. The savings guarantee is contingent on several buildmg operations factors described
in the Conditional Savings Guarantee section later in this report.

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 and 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. Also, if transformers are not properly vented to the exterior, their

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ENERGY EFFICIENT INVESTMENTS INC.

heat output adds to the building cooling load.

EEI recommends the replacement of existing efficient transformers in order to improve the energy
efficiency of the electrical distribution 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) 75kVA
(8) 112.5 kVA
(3) 150 kVA
(5) 220 kVA
(1) 225 kVA
(2) 300 kVA
(1) 400 kVA

IPMVP Option B, Retrofit Isolation with All Parameter Measurement, has been chosen for this ECM. This
option has been chosen because the only parameters changing in the implementation of this ECM are the
transformer losses. EEI will use current transducers to measure the losses for each transformer over a one
month period to obtain a representative transformer loading profile.

ECM 5- Retro Commissioning

This is an allowance for an engineermg 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.

IPMVP Option C, Utility Data Analysis of Whole Building, has been chosen for this ECM. This option
has been chosen because the wide ranging effects of Retro Commissioning on building energy
performance does not lend itself to isolation measurement. EEI has established the building baseline
energy usage using utility data, see “Baseline Development and Performance Period” section. The
building energy usage will continue to be recorded after the ECM implementation and compared to the
baseline to determine savings. The savings guarantee is contingent on several building operations
factors described in the Conditional Savings Guarantee section later in this report.

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-ton ceiling cassette systems, (7) 1.5-ton ceiling cassette systems, (1) 2-ton
ceiling Cassette system, (1) 1 ton wall mounted system, (2) 1.5 ton wall systems, (1) 3.5 ton under

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ENERGY EFFICIENT INVESTMENTS INC.

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

IPMVP Option B, Retrofit Isolation with All Parameter Measurement, has been chosen for this ECM. This
option has been chosen because the only parameter changing in the implementation of this ECM is the mini
split Energy Efficiency Ratio (EER). EET will use current transducers to measure the EER for a 20% sample
of the mini splits over a one month period to obtain a representative loading profile.

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.

IPMVP Option A, Retrofit Isolation with Key Parameter Measurement, has been chosen for this ECM. This
option has been chosen because the only parameter changing in the implementation of this ECM is the
combustion efficiency. EEI will use a flue gas analyzer to measure each water heater efficiency before and
after ECM implementation.

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.

IPMVP Option A, Retrofit Isolation with Key Parameter Measurement, has been chosen for this ECM. This
option has been chosen because the only parameter changing in the implementation of this ECM is the
airflow amount. EEI will use airflow hoods to measure a 20% sample of diffuser airflow cfm before and after
ECM implementation.

ECM 9- Kitchen Hood

The existing kitchen exhaust system has a basic on/off operation. This results in the system operating during
times when it doesn’t need to be operating and heated or cooled 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
located in the duct work and control operation based on the temperature inside the duct.

IPMVP Option B, Retrofit Isolation with All Parameter Measurement, has been chosen for this ECM. This
option has been chosen because the only parameter changing in the implementation of this ECM is the
kitchen hood exhaust fan speeds. EEI will use Energy Management System (EMS) trending data over a one
month period to obtain a representative loading profile.

ECM 10- Walk In Coolers

EEI recommends refngeration controllers on walk-in coolers and freezers and 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 than the standard two-pole motors. Energy savings

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