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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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