Four steps to successful energy management
Trimming a factory’s energy costs is a great way to boost a manufacturing company’s bottom line. However, implementing a comprehensive energy management program can prove challenging for a number of reasons, not the least of which is the need for close collaboration among individuals-such as process engineers and facilities managers-who historically have not had to forge working relationships.
Following are four steps that are almost guaranteed to put a manufacturing company on the road to succeeding with adoption of a comprehensive energy management program.
1. Aim for low-hanging fruit and expect incremental progress.
By definition, a manufacturing company’s primary business is not devising energy management strategies. This may sound obvious, but it is an important detail to remember because the attention span for green initiatives is very short-particularly among CEOs and CFOs, who must always be concerned about whether any activity ultimately will make-or cost-the company money.
With that in mind, champions of comprehensive energy management programs must look to start with projects that can be implemented quickly and show nearimmediate return on investment. That means looking for low-hanging fruit.
If, for example, your manufacturing floor sounds like a giant air leak during off-shifts, making changes to the compressed air system may be a good place to start an energy management program.
Compressed air flow meters are very affordable (~$500) and can be easily installed on a plant’s distribution circuits to determine which production areas consume the most air. In many cases, area supervisors can drastically reduce wasted air by implementing simple procedural routines.
The payback on compressed air flow meters can be staggering, considering that operating a 200-hp compressor costs upwards of $50,000 per year in energy, according to U.S. Department of Energy studies.
Achieving a quick win of this type would be great for securing management support-and possibly funding- to implement additional projects.
2. Foster open communication between process engineers and facilities managers.
Comprehensive energy management within the industrial segment is best thought of in terms of optimizing the ratio between energy spent and productive output of the facility. Disconnecting all electricity from the plant is great for lowering the monthly bill, but obviously this would be counterproductive to the business.
To be comprehensive, an energy management plan requires collaboration between process engineering and facilities management, even though these two groups traditionally operate in separate places using different technologies. (Readers who have experienced the convergence of engineering and IT are correct to draw analogies.)
Fortunately, the technical barriers between process engineering and facilities management have shrunk drastically in the last few years thanks to standardization efforts driven by new communication protocols, such as BACnet and LON protocols.
Industrial controls and building controls are now more compatible than ever before, but the evolution is not complete. So it’s important to have at least one individual on the energy management project team who understands both sides.
Hiring an independent advisor to help develop energy management solutions is a great way to fill this role. For best results, find an advisor or company that is technology independent so they will focus on fitting a solution to your company’s needs rather than wedging your needs into their system.
3. Build on technologies you know.
A simple Google search for "energy management system" yields a plethora of meters, gadgets, and software packages claiming to be the answer for all conservation needs. While many of these offerings are compelling, this is definitely a situation in which the buyer must be extremely aware.
Buying a monolithic energy-management solution from a single vendor is likely to be a major, costly mistake. Building a solution around technologies the company is familiar with-and already owns-will be much more cost-effective, and have a much higher chance of success.
The rationalization for this is simple and draws upon many of the topics already discussed.
- Funding for energy management projects is often fickle and requires quick, decisive return on investment (ROI). Large initial investments have been the nonstarter for many good plans.
- Since energy projects are iterative and incremental, it’s better to use familiar technologies, making it easier to implement projects internally.
- Anything that is installed has to be maintained. Choosing familiar technologies allows existing staff to maintain the solution without expensive third-party support contracts.
- Leveraging systems you know and already own is a much more viable option today because building controls and industrial controls are more interoperable than ever before thanks to standardization technologies, such as OPC, BACnet, and LON.
Following are two real-world examples that demonstrate this philosophy.
Company A operates a large manufacturing facility that is more than 30 years old. The manufacturing floor is standardized primarily on GE PLC and SCADA products that are supported by the company’s internal engineering department. The plant’s facility management is contracted to Johnson Controls, and a Metasys building management system is used to control the large HVAC and lighting infrastructure. This company needs to reduce electricity costs associated with welding and has chosen to construct an energy monitoring solution using a GE Cimplicity SCADA.
The initial system is focused on one comparatively new area of the plant that is already equipped with smart electrical meters. By keeping the initial system small, this company has demonstrated significant savings for that portion of the plant while also creating an energy-management system infrastructure that can be expanded to the rest of the facility.
Future projects will require significantly more capital investment for meters and installation; however, the tangible savings from phase 1 of the project make justification easy.
Company B is a biotechnology manufacturer whose product line is constantly evolving and whose facility is always in some state of construction. This company’s production processes are managed with automation and control technology from Rockwell Automation that is compatible with open industry standards, and its engineering group is very skilled at adapting this technology to the company’s ever-changing requirements.
However, the company’s building management systems are based on proprietary technology that is largely un-maintainable by in-house personnel. As a result, it is virtually impossible for this company to implement a meaningful energy management program.
To correct this problem, the company has chosen to incrementally migrate from its proprietary building management system to more open technologies that can be supported by its internal group.
The new architecture uses Rockwell FTView SE as the new building management HMI. It communicates via BACnet to Tridium JACE controllers that can replace the proprietary processors.
This new architecture also allows the company to leverage its existing OSIsoft PI historian as the central archive for energy trending and analysis.
4. Publicize your success.
The final suggestion for a new energy management team is to always take credit for success. Publicizing the tangible results of energy projects is crucial to garnering support for future projects.
Craig Lechene is co-founder and Managing Partner for RoviSys Building Technologies. He holds an Electro-Mechanical Engineering degree from Penn State University, a Master of Business degree from NC State University and has worked extensively in the life sciences and specialty chemical industries. His engineering experience includes process control and facility automation; both of which underpin RoviSys BT’s specialization in building automation and energy management solutions for industrial accounts.