It’s easy to understand why Industrial Energy Management often starts with the building utilities, such as HVAC adjustments, boiler tuning, lighting upgrades, and air compressors:
1. The role of the Energy Manager is often assigned to the facilities engineering department, who has direct influence on these systems.
2. These are the easiest to understand, visualize, and justify for building and communicating the business case for these investments.
I can see a lot of evidence that suggests that this approach is akin to conserving water on a golf course by eliminating flush toilets. Certainly, these efforts help but achieve only a fraction of the potential. According to the US Manufacturing Energy Consumption Survey (MECS), 84% of all energy used in a process facility, on average, is used by the process itself (see pie chart below) The proportion is even greater in certain industries, such as mining, metals and mineral processing, and water treatment.
What’s more, true process energy optimization often goes hand-in-hand with reduced maintenance costs, less downtime, and increased throughput-after all, machines that run less frequently and at lower temperatures tend to break down less often, which essentially yields higher ROI.
The concept of process energy mitigation, however, is often perceived as too nebulous to be seriously considered as part of an energy management program—too difficult to talk about for all except for the true process experts. What I think is needed is a checklist of techniques which can be easily understood and articulated by all of the energy stakeholders including facilities engineers, process specialists, financial controllers, sustainability managers and executives, so that a business decision can be better supported using a common language.
You may be surprised but such a list is emerging and, in fact, is not such a long list. Of the techniques that can be applied to reduce the energy demand of a process, which we can call “process demand functions”, it turns out that there are only five:
1. Energy Event Management
Detection and Analysis of process changes that cause consumption to exceed forecast
2. Peak Demand Management
Minimizing peak demand which triggers higher rates
3. Scheduled Demand Management
Minimizing costs by shifting demand to low cost time periods
4. Idle State Management
Minimizing energy draw during idle process conditions
5. Demand/Response Management
Offering energy capacity back to grid per request in exchange for incentives
Giving these techniques consistent labels, such as the ones proposed, will only help promote the development of the technologies to support these functions and enable industrial plants to more easily focus their energy mitigation efforts on their process, where the majority of energy is used.
Despite the short list of process demand functions, sustainable industrial energy management is a challenge many companies face today. Has anyone started to look into their process demand functions? What type of energy initiatives does your company have in place today? Let’s start the energy conversation here…