**2. Methodology**

This section describes one method to survey and analyze the energy use of an industry. The industrial energy audit may be divided into three main parts: the survey, the analysis and the proposed measures. The expected result of the energy audit is a number of measures that will increase the energy efficiency, switch from non-renewable to renewable sources and decrease the energy use of the company or in the energy system as a whole. The result is normally presented in a report.

In the three parts of the audit you have different tasks:

Energy survey – What do we have?


Energy analysis – How "bad" is the utilization of the supplied energy? Where does it go wrong? How far can we reach?


Suggested measures – What can we do about it?

**•** Identify possible solutions.

may be dimensioned both for ventilation and cooling. If you see that the device is taking care of two different processes you also see that there is a point in adjusting the flow depending on

The concept is based on the objective of the industrial process, the mixing of materials, cooling or drying a product, the production of compressed air or to carry goods, etc. Unit processes are considered to be the smallest components within an industrial energy system. Unit proc‐ esses are general for all industries, thus providing opportunities for comparisons of a given unit process, such as forming, between different industries. Using the unit processes to rep‐ resent the "building blocks" of energy use also enables modelling, e.g. simulation or optimi‐

This section describes one method to survey and analyze the energy use of an industry. The industrial energy audit may be divided into three main parts: the survey, the analysis and the proposed measures. The expected result of the energy audit is a number of measures that will increase the energy efficiency, switch from non-renewable to renewable sources and decrease the energy use of the company or in the energy system as a whole. The result is normally

Energy analysis – How "bad" is the utilization of the supplied energy? Where does it go wrong?

**•** Identify mismatching energy quality, where high quality energy is used for non-demanding

**•** Sum up the potential for energy efficiency and conversion for the system as a whole.

**•** Identify technologies that are far from BAT (Best Available Technology).

purposes, for example, electricity for low temperature heating.

zation modelling of industrial energy use. For example, see [16].

In the three parts of the audit you have different tasks:

**•** Allocate energy use to different unit processes.

**•** Identify both system errors and detail problems.

the cooling demand.

118 Sustainable Energy - Recent Studies

**2. Methodology**

presented in a report.

Energy survey – What do we have?

**•** Identify idling power and energy.

**•** Identifying barriers and driving forces.

Suggested measures – What can we do about it?

**•** Define the system boundary.

**•** Identify unit processes. **•** Quantify energy supply.

How far can we reach?

