An energy audit is completed at a residential or commercial building to determine its energy efficiency. The audit will provide you with a complete electricity consumption and efficiency assessment.
You can obtain important information regarding your usage and star rating from the audit report. With this information, you can identify and correct any usage issues to cut electricity costs. It’s advisable to always undertake an energy audit before implementing a renewable energy system.
The main goals of Energy Audit :
§ Understanding how energy is used within the system or process, and where it is wasted
§ Finding alternative measures to reduce energy losses and improve the overall performance
§ Performing a cost-benefit analysis for highlighting which energy efficiency measures are best to implement
Different types of energy audits :
· Historical Data Analysis-Utility bills are collected for 1-3 years to evaluate the home or facilities energy consumption history and energy usage profiles.
· Do It Yourself Home Energy Audits, Walk-through keeping a check list of repairs or changes needed to increase home energy efficiency. Sealing cracks and leaks can save 5-30% on heating bills in winter.
· Walk-through audits, a brief review of the home or facilities utility bills and other operating data, and a walk-through of the home or business to become familiar with the building operation and identify glaring areas of energy waste or inefficiency.
· Professional energy audit by certified energy auditor/energy rater. Many professional energy audits will include a blower door test. Most will also include a thermography scan and will identify all energy conservation measures appropriate for the home or business.
What is the value of an energy audit?
The U.S. Department of Energy estimates that having an audit performed on your home and making the suggested recommendations like sealing cracks, leaks and properly insulating your home could save you 25% or more on your yearly energy consumption. Depending on the size of your home and the extent and type of energy efficiency upgrades performed, your savings will vary. The cost of a CCF of natural or propane gas and the cost of a kWh of electricity will affect your yearly savings. However, your savings could be from several hundred dollars to the over a thousand dollars per year.
Simulation-based energy audit procedure for non-residential buildings :
A complete audit procedure, very similar to the ones proposed by ASHRAE and Krarti (2000), has been proposed in the frame of the AUDITAC and HARMONAC projects to help in the implementation of the EPB (“Energy Performance of Buildings”) directive in Europe and to fit to the current European market.
The following procedure proposes to make an intensive use of modern BES tools at each step of the audit process, from benchmarking to detailed audit and financial study:
· Benchmarking stage: While normalization is required to allow comparison between data recorded on the studied installation and reference values deduced from case studies or statistics. The use of simulation models, to perform a code-compliant simulation of the installation under study, allows to assess directly the studied installation, without any normalization needed. Indeed, applying a simulation-based benchmarking tool allows an individual normalization and allows avoiding size and climate normalization.
· Preliminary audit stage: Global monthly consumptions are generally insufficient to allow an accurate understanding of the building's behaviour. Even if the analysis of the energy bills does not allow identifying with accuracy the different energy consumers present in the facility, the consumption records can be used to calibrate building and system simulation models. To assess the existing system and to simulate correctly the building's thermal behaviour, the simulation model has to be calibrated on the studied installation. The iterations needed to perform the calibration of the model can also be fully integrated in the audit process and help in identifying required measurements and critical issues.
· Detailed audit stage: At this stage, on-site measurements, sub-metering and monitoring data are used to refine the calibration of the BES tool. Extensive attention is given to understanding not only the operating characteristics of all energy consuming systems, but also situations that cause load profile variations on short and longer term bases (e.g. daily, weekly, monthly, annual). When the calibration criteria are satisfied, the savings related to the selected ECOs/ECMs can be quantified.
· Investment-grade audit stage: At this stage, the results provided by the calibrated BES tool can be used to assess the selected ECOs/ECMs and orient the detailed engineering study.
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