Agenda

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.

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:

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:

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.

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

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

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

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

Economic Analysis

Utility Analysis