Energy Audit is the key to a systematic approach to decision making in the area of energy management. The verification, monitoring & analysis of the use of energy including submission of the technical report containing recommendations for improving energy efficiency with cost-benefit analysis & an action plan to reduce energy consumption
Energy today has become a key factor in deciding the product cost at the micro level as well as in dictating the inflation. Energy cost is a significant factor in economic activity as par with factors of production like capital, land, and labor. The imperatives of an energy shortage situation call for energy conservation measure, which essentially mean using less energy for the same level of activity. Energy Audit attempts to balance the total energy inputs with its use and serves to identify all the energy streams in the systems and quantifies energy usages according to its discrete function. Energy Audit helps in energy cost optimization, pollution control, safety aspects and suggests the methods to improve the operating & maintenance practices of the system.
Energy Management Cycle:
• Company Commitment
• Understanding Energy Use
• Planning Organisation
• Verification, Monitoring, and Reporting
Three stages of an energy audit:
Preparation: Before the auditor’s visit, gather information on your home: year of construction, energy bills, type of heating, heating service certificate, plans for the building, etc.
Audit: first of all, the information that you have gathered about your home is analyzed. After this, when conducting a full audit, the auditor checks:
The quality of the insulation of the outside walls
The proper functioning of the heating installation, the hot water system, and the ventilation system
The proper use of your various pieces of equipment (thermostats, thermostatic valves, etc.)
Report: All the data collected during the audit are encoded into a specialized software program. This application is used to attribute a label from A to E to all the elements analyzed. The auditor then makes recommendations and draws up a projection of the way your home would be if you were to follow these recommendations. In the last stage, the auditor draws up a final report and adds any observations he may have.
Objectives of Energy Audit:
• Identifying the quality and cost of various energy inputs.
• Identifying potential areas of the thermal and electrical energy economy.
• Implementation of measures for energy conservation & realization of savings.
• Assessing the present pattern of energy consumption in different cost centers of operations.
• Relating energy inputs and production output.
• Highlighting wastage’s in major areas.
• Fixing of energy saving potential targets for individual cost centers.
Energy Audit Methodology:
|Pre Audit Phase||Audit Phase||Post Audit Phase|
|• Plan & Organise
• Walkthrough Audit
• Internal Interview with client
• Brief Meetings and Awareness programs
|• Primary Data Gathering
• Process flow & Energy Utility Diagram
• Conduct survey & Monitoring
• Analysis of Energy use
• Identification and Economic operation
• Cost & Benefit Analysis
• Reporting and Presentation
|• Implementation & Follow-up
• Monthly Monitoring
• Energy Performance contract
• Collections of data on operational parameters, energy consumption in electrical and power quality etc., through a questionnaire.
• Study the existing plant capacities and their performance to assess plant operations.
• Study of the specific electrical energy consumption department-wise and plant as a whole.
• Study of the power sources, distribution system, and drive controls, load factor and efficiency of large motors (above 10 kW), process automation, plant illuminations etc.
• Collection of requisite data and analysis and identification of specific areas with potential for conservation of thermal and electrical energy.
• Field measurements of operational parameters and carrying out heat and mass balance.
• Study of limitations, if any, in the optimal use of thermal and electrical energy.
• Formulation of specific recommendations along with broad system concept for the conservation of thermal and electrical energy.
• Preparation of capital cost estimates and establishing techno-economic feasibility for recommended measures.
• No investment and/or marginal investment by doing system improvements and optimization of operations.
• Major investment due to the incorporation of modern energy-intensive equipment and up-gradation of existing equipment.
• Formulating a tentative time schedule for implementation of the recommendation.
• Undertaking broad cost-benefit analysis in terms of savings in energy consumption per unit of production and pay-back period.
|System Parameters||Areas for Improvement|
|Lighting||Optimization of feeder voltages applies principles of task lighting and use of high efficacy lamps, gear, and luminaires.|
|Refrigeration & Air Conditioning||Temperature optimization, end-use load reduction, use of favorable ambient conditions, better selection of equipment’s, improved instrumentation for control, flow optimization, substitution with less energy-intensive alternatives, improvement of machine efficiency, innovative technologies for Precision Air Conditioning for Low Relative Humidity and inter-fuel substitution|
|Compressed Air||Optimisation of air pressure, reduction in leakage and inappropriate end-uses, evaluation of electro-mechanical alternatives, use of energy efficient air dryers, improving compressor control practices, improving compressor efficiencies and selection of energy efficient compressors & controls|
|DG Set||The operations of DG sets to evaluate their average cost of Power Generation, Specific Energy Generation and subsequently identify areas wherein energy savings could be achieved after analyzing the operational practices etc. of the DG sets.|
|Power System||Power Factor improvement, Maximum Demand control, measurement of harmonics and estimation of distribution losses in transformers & cables|