Economic Analysis
Making good economic decisions requires analysis of available information and
understanding the monetary value of time. A Discounted Life Cycle Cost Analysis
(DLCCA) is very useful for this type of analysis when multiple alternatives exist. This is
the Federal Energy Management Program (FEMP) approved method of analysis and is
used to aid in decisions that are based on the most favorable economic outcome. The
Nashua School District can see the estimated time it will take for this energy project to
payback shown on the ECM Matrix on page 3.
The key assumptions EEI used in our Economic Analysis include the baseline gas and
kWh use which are the average fiscal year totals from2016 - 2018. Building interior
lighting fixtures were assumed to run 2,000 hours per year, this is based on observation
and interviews with staff. Exterior fixtures were assumed to run 4,380 hours per year.
Additionally, the estimated energy savings calculations are dependent upon the building
HVAC controls being controlled to a defined set of temperatures. These standards of
comfort can be seen below.
EEI, Inc.
Nashua School District
Occupied Unoccupied
Building Setpoint °F Heating Tire) tai marl]
Nashua High School North
Classrooms 68 60 72 80
Media Center 68 60 72 80
Cafeteria/Kitchen 68 60 72 80
Auditorium 68 60 72 80
Offices 68 60 72 80
Gym 65 60 72 80
Library 68 60 72 80
Hallways 68 60 72 80
Nashua High School South
Classrooms 68 60 72 80
Media Center 68 60 72 80
Cafeteria/Kitchen 68 60 72 a0
Auditorium 68 60 Ta 80
Offices 68 60 ee 80
Gym 68 60 72 80
Library 68 60 72 80
Hallways 68 60 72 80
Notes:
1. All setpoints and times are suggested, Actual values to be determined after discussions with Nashua School District.
2. EE! will program a General Building Override button. This will allow the building operator to override the building schedule for non-scheduled events (such as snow days)
ENE Systems, Inc. / Energy Efficient Investments, Inc.
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