Energy audit flow chart

Source: South African Energy Department.

According to South African Energy Department, the key steps in the energy audit, after the initial client meetings and historical data analysis,


7. Inventory energy use—prepare a list of all energy consuming loads in the audit area, and quantify their consumption and demand characteristics;

described later on are not mutually exclusive. More than one method may be applied for comparison if there is such a requirement. A broad level ROI or NPV comparison can be done initially, followed by detailed cost variance or cash flow variance analysis. Comparison is a step-by-step approach so that causes are identi-

> <sup>¼</sup> Gain from investment � cost of investment Cost of Investment

Once the variance figures are calculated, if they are significant, the possible causes for the same are explored. An auditor goes by exceptions from there he tries to reach the root causes of deviations. This process of investigation can be effective only if an auditor possesses skills of inquisitiveness and skills of persuasion and negotiation [4]. A summary report of the energy audit findings should also be

Once the causes are ascertained, the post completion auditor can give his recommendations based on which the manager may take decisions for cash flow forecasting to reinvest or abandon the ongoing project. Hopefully, after the post completion audit, the cash flow prediction and project evaluation become more

There are three techniques of building energy audit economics, namely

In this method, only the project cost (actual and estimated) is studied and the revenue aspect is not included in the audit. This approach is adopted when the energy audit is conducted during the execution or just after the completion of the project.

fied systematically with minimum cost, time and energy [4].

<sup>¼</sup> Investment gain Investment base

<sup>¼</sup> Return Benefit ð Þ Investment cost ð Þ

6.4 Establish the possible causes of variance

7. Building energy audit economic techniques

c. Cash flow and financial criteria analysis and

d.Present value depreciation technique.

prepared.

accurate [4].

6.5 Final recommendations

a. Cost variance analysis,

b.Profit variance analysis

7.1 Cost variance analysis

141

Cost of Investment

ROI <sup>¼</sup> Net income

Economic Aspects of Building Energy Audit DOI: http://dx.doi.org/10.5772/intechopen.85490


Each step involves a number of tasks that are described in the following sections. As suggested by the flow chart, several of the steps may result in the identification of potential EMOs.
