• Language:  

ASHRAE Energy Audit Levels I, II & III Compared

 ASHRAE Level II and Level III Audits: What is the difference?

An energy audit is a study of a buildings energy consuming systems. It provides a building owner useful insight into how energy is being used and where it is being wasted. The American Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE) has provided standards for energy companies to use when conducting an energy audit. Three different levels of energy audit have been established; Level I is the least detailed and Level III is the most detailed. By knowing what each level entails, a building owner can determine which type of audit will be the most cost effective.

 

Level I Audit (Level 1: Simple walk-through)

A Level I Audit is a simple building walk-through. It is the most expedient type of energy audit that will result in only a high-level analysis of energy use. Energy conservation measures (ECMs) will be identified, but no cost analysis will be performed.

 

Level II Audit (Level 2: Energy Survey & Analysis)

A Level II Audit looks at all base building systems and examines how they use energy. It begins with a study of past energy bills and is followed by investigation of current performance. The energy audit report will include a breakdown of energy consumption and will outline the low- to no-cost measure that can be implemented to reduce energy use.

 

Level III Audit (Level 3: Investment-Grade Technical Analysis)

A Level III Audit is the most detailed audit. It will provide a granular analysis of energy inputs and outputs in a building. In addition to base building systems, the building envelope will be examined to ensure efficient use of heating and cooling resources. As part of a Level III Audit, data logging equipment will be used to record temperature, humidity, and the hours of operation for the major building systems and equipment. ECMs will be identified and accompanied by an investment-grade cost analysis. Cost savings for ECMs will be determined using computer simulation. The ECMs will be assessed singularly and collectively to investigate the interactive effects of the measures and their dynamic effect on the building conditions using hourly weather data for a full calendar year.

 

New York Local Law 87

For commercial buildings in New York City, a Level II or Level III Energy Audit and retro-commissioning must be performed once every ten years under Local Law 87. A Level I Audit is not sufficient for Local Law 87 compliance. The New York State Energy Research and Development Authority (NYSERDA) provides a 50% rebate for qualified audits. ConEdison and Lockheed Martin have also partnered to give a 50% rebate to customers that perform an ASHRAE Level III Audit.

 

 

Level I Audit

Level II Audit

Level III Audit

Establish building area

x

x

x

Utility bill analysis

x

x

x

Building benchmarking

x

x

x

LL87 compliance

 

x

x

Analysis of base building systems

 

x

x

Breakdown of energy end use

 

x

x

Outline of low- to no-cost ECMs

 

x

x

Granular study of energy end use

 

 

x

Anaysis of capital intensive ECMs

 

 

x

Investment grade financial analysis

 

 

x

Computer simulation of ECMs

 

 

x

Data logging

 

 

x

 

 

Associated Renewable’s Energy Solutions Department is well qualified to perform energy auditing and secure all available incentives. For more information, contact info@associatedrenewable.com.