Energy Performance Indicators

Performance indicators for production ECCs have to be expressed as the ratio of measured energy and resource amount or corresponding production output over a defined period of time (Fig. 2.8). The performance indicators must be defined for each designated energy cost center (ECC). They can be defined as the ratio of energy to production output, or to raw material input, or even to product monetary

Performance Monitoring Data Presentation Data Interpretation

Reporting Data Archive

Compressed Air System_

Refrigeration System

Cogeneration

Building Automation HVAC Lighting Regulation

Building Automation HVAC Lighting Regulation

Performance Monitoring Data Presentation Data Interpretation

Environmental Impact

Measurements

— Energy Meters

Environmental Impact

Measurements

— Energy Meters

Figure 2.7 Example of Web Based EEMS

value. This will depend on the type of products and production quantity control method and can vary from one ECC to another even within the same factory.

On the utility side PIs are defined in the technically familiar way of output/input ratios, which basically express the efficiency of energy conversion from one form to another.

For each energy type used at an ECC, a separate PI has to be defined. Some energy types that may be used are listed in Figure 2.2. If the use of any energy type is significant, it has to be measured directly. The 'significance' can be determined based on the rough economic criteria that the cost of meter should be around 10-20 % of the annual cost of the relevant energy type.

When performance indicators are defined and measured as shown in Figure 2.9, they provide the basis for extraction of some additional useful information:

(i) calculating energy and mass balance on the ECC level;

(ii) accounting for raw material waste, rework or rejects;

(iii) monitoring quality on the ECC level;

(iv) calculating all direct costs (providing they are measured) associated with the ECC concerned;

(v) accounting for productivity of people working at the ECC, even on a shift basis.

However, these analyses will provide useful results only if input data are adequate, reliable and relevant.

RAW MATERIAL USE PERFORMANCE:

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