Importance of Energy Auditing

Kevin Fisher

Energy Engineer

Energy audits are a great way to find energy conservation measures (ECM’s) which can lead to significant savings on a customer’s utility bill. Energy assessments are often performed by engineering companies, who will analyze a sites energy use to discover and recommend ECM’s. Energy users, small to large, can find cost effective ways to finance energy savings, resulting in more money in the customer’s pocket.

There are different levels of energy audits depending on the depth of the study. The American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) describes the standards on three different levels of energy audits in their official handbook. Below is a summary of each level of auditing.

Level I Energy Audit

A level I audit consists of an analysis of a sites energy bills as well as a brief walkthrough of the building. A level I audit will show a site’s energy costs and a brief high level search for potential ECM’s. A level I audit may provide a rough cost analysis of certain ECM’s compared to their energy saving.

Level II Energy Audit

A level II audit builds upon information presented in a Level I audit. A level II audit will include a more in depth energy breakdown as well as a more in depth or multiple walkthroughs. Also, a list of potential ECM’s with their costs and associated savings are presented to the customer. A level II audit may include energy modeling and/or energy monitoring to provide a better understanding of a buildings energy use.

Level III Energy Audit

A level III audit provides the most detailed report out of the three levels, offering in depth pricing and savings on ECM opportunities. A level III audit will have a high level of confidence on savings and prices associated with implementing ECM’s at the building. An appropriate financing model may be suggested to the customer based on their financial requirements.

Energy audits provide a unique pathway for customers to save money. Energy conservation and cutting utility costs are extremely important as energy prices rise. Energy Audits are great investments for the future, often resulting in immediate returns and a quick payback.

The Advantages of Energy Modeling

Neil Wittberg

Plug Smart Energy Engineer

Rebates offered by utility companies can be a great way for clients to recoup capital expense for facility improvement. We have an excellent team of engineers at Plug Smart that have a great reputation for making sure that our clients receive the highest rebates possible. Whenever our team comes across a project or an Energy Conservation Measure (ECM) that isn’t eligible for a standard rebate, prescribed by the utility company, we look into more analytical custom methods to measure the actual savings. One of the ways that we are able to do this is through building energy modeling. Energy modeling is a technique where a building is created in a computer, using modeling software.  All of the different aspects of the building are then specified (HVAC equipment, lighting, occupancy schedules, etc). Once the building is created in the computer, another identical model is created as a baseline to compare against.  The only difference between the two is that the baseline model is created using minimum design elements required by ASHRAE code. Finally, the energy use of both models is simulated and compared. This methodology allows Plug Smart to deliver much larger rebates than most companies. This in depth approach has endeared us to our clients and has generated close to $200,000 in rebates in the past few months alone. We are currently working on several models, mostly for geothermal facilities.

The potential for modeling, however, isn’t limited to just rebates. We have also used models to help support some of our project proposals.  Often, we find that it is difficult to calculate the actual savings from certain ECMs due to all of the complex system interactions within a modern building.  In this case, having a model can be a huge benefit.  In just a few minutes, virtually any ECM can be simulated and quantified, and since modeling software simulates every system in a building simultaneously it captures these interactions. This gives our proposals more credibility and helps safeguard our clients against projects with unrealistic paybacks. Looking forward, energy modeling will likely become more widespread as the standard tool for doing most building energy analysis. As improvements are made to the software, the process will become quicker, more accurate, and more cost effective.