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Commercial Building Energy Auditing Procedures

Module 2

Part A

This material is based upon work supported by the National Science award 2201631. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.

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Module 2 Learning Outcomes

• Energy Efficiency Measures
• Energy Calculation Methodology
• Energy Audit Report

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Site Visit and Data Collection

• Site Visit
• Preassessment Interview
• Photographs
• Building Automation System
• Preparation Activities
• Initial Walk-Through
• Detailed Audit Procedures
• Practical Arrangements for Site Work
• Exit Briefing
• Safety
• Measurement

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EEM

• Energy Efficiency Measure
• ECM
• ECO

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• “ASHRAE selected Energy Efficiency Measure as the phrase most descriptive of the actions and equipment by which building energy efficiency is improved.” pg 63

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Operation: focused on scheduling and control

Maintenance: Routine preventive, predictive scheduled actions preventing failure or decline of equipment

EEM and O&M

• Energy Efficiency Measure
• a collection of actions and equipment installations that reduce a building’s on-site energy use

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• Operations and Maintenance (O&M)

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Capital Investment EEMs

• Capital Investment
• Replacement of energy using equipment
• Significant changes in building envelop (windows/walls)
• Installation of new equipment such as solar PV

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TIME

Calculations for Energy Savings

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kW

TIME

Calculations for Energy Savings

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kW

100 ft x 100 ft

LPD = 2W/sf

Lights “ON” 8 am to 4 pm M-F

Find:

Daily Demand (kW)

Energy Use for a day (kWh per day)

Energy Use for a week (kWh per week)

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Demand = 2 watt/sf x sf

Sf = 100 ft x 100 ft or 10,000 sq.ft

Demand = 10,000 sf ft x 2 watt/sq ft

Demand = 20,000 Watt

Or 20 kW

Weekly Energy Use = 20 kW x 8 hrs x 5 Days/week

= 160 kWh x5

= 800 kWh

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Calculations for Energy Savings

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kW

2 ways to save energy

reduce lighting power density (ex: T8 – LED)

reduce “ON” time (ex: occupancy sensors)

Energy (kWh) = Demand (kW) x Time (hrs)

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Calculations for Energy Savings

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kW

Example 1: New lighting reduced the LPD from 2 watt/sf to 1 watt/sf. Room area = 10,000 sq.ft.

How much energy is saved in 1 week?

Energy (kWh) = Demand (kW) x Time (hrs)

Existing Energy Use = 2 W/sf x 10,000 sf x 8 hrs/day x 5 days/week x 1/1000 kW/W

= 800 kWhr

Proposed Energy Use = 1 W/sf x 10,000 sf x 8 hrs/day x 1/1000 kW/w

= 400 kWh

Energy Saved = 400 kWh

TIME

Calculations for Energy Savings

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kW

Example 2: New occupancy sensors reduced the “ON” time from 8hrs/day to 6 hrs/day

How much energy is saved in 1 week?

Energy (kWh) = Demand (kW) x Time (hrs)

Existing Energy Use = 2 W/sf x 10,000 sf x 8 hrs/day x 5 days/week x 1/1000 kW/W

= 800 kWhr

Proposed Energy Use = 2 W/sf x 10,000 sf x 6 hrs/day x 5 days/week x1/1000 kW/W

= 600 kWh

Energy Saved = 200 kWh

Calculations for Energy Savings

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EEM #1 Lighting Upgrade

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EEM #2 Occupancy Sensors

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Simple Payback = Cost/Savings (year) (see page 75)

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Commercial Building Energy Auditing Procedures

Module 2

Part A

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END OF VIDEO

CreateEnergy.org

This material is based upon work supported by the National Science award 2201631. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.

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