Types of Energy Audit

Types of Energy Audit

• The energy conservation opportunities may be easily identifiable or may be identified only after intermediate study or detailed study.
• The energy audits are classified into three types :

1. Simple Walk - through energy audit.
2. Intermediate energy audit.
3. Comprehensive (Exhaustive) energy audit.

• The general remarks are as under.

Types of Energy Audit	Time duration	Cost of Audit	Investments for Implementing
1.Walk-through EA	SHORT	LEAST	LEAST
2.Intermediate EA	MODERATE	-	-
3.Comprehensive EA	LONG	HIGH	HIGH

• The objectives of these three types are common.
• These audits are separately conducted and their audit reports are separately submitted.
• But they may have certain interface and overlap.

Types of Energy Audits

• The type of energy audit to be performed depends on :

1. Function and type of industry
2. Depth to which final audit is needed, and
3. Potential and magnitude of cost reduction desired.

• Thus Energy Audit can be classified into the following two types :

1. Preliminary Audit
2. Detailed Audit.

Preliminary Energy Audit Methodology

• Preliminary energy audit is a relatively quick exercise to :
• Establish energy consumption in the organization.
• Estimate the scope for saving o Identify the most likely (and the easiest areas for attention).
• Identify immediate (especially no/low cost) improvements/savings.
• Set a ' reference point.
• Identify areas for more detailed study/measurement.
• Preliminary energy audit uses existing , or easily obtained data.

 Detailed Energy Audit Methodology

• A comprehensive audit provides a detailed energy project implementation plan for a facility, since it evaluates at (5-15) major energy using systems.
• This type of audit offers the most accurate estimate of energy savings and cost.
• It considers the interactive effects of all projects, accounts for the energy use of all major equipment and includes detailed energy cost saving calculations and project cost.
• In a comprehensive audit one of the key elements is the energy balance. This is based on an inventory of energy using systems, assumptions of current operating conditions and calculations of energy use. This estiimated users then compared to utility bill charges Phase - Post Audit Phase
• Detailed energy auditing is carried out in three phases : Phase I, II and  Phase III

Phase I - Pre Audit Phase  

Phase II - Audit Phase

Phase III- Post Audit Phase