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Digital twins for campus energy plants
Test campus energy upgrades before breaking ground. Digital twins help universities validate equipment decisions and avoid million-dollar mistakes.
Campus energy decisions can cost millions of dollars. However, universities often make these decisions and subsequent investments without fully understanding how new equipment will integrate with existing systems.
Big capital projects often focus on the design and construction phase, but that’s only a fraction of a project’s lifecycle. A digital twin can shift the focus to performance over time, helping universities understand not only how systems will start up, but how they’ll age, adapt, and perform ten years down the line.
The challenge of modern campus energy systems
Campus energy infrastructure has evolved far beyond the single-fuel steam plants of the past. Today, many universities operate hybrid systems—1970s boilers alongside new geothermal plants, chilled water storage, and smart controls—serving buildings with vastly different demand profiles.
That progress brings complexity. Traditional tools still help compare equipment and calculate payback, but they’re not designed to show how legacy and new systems perform together. A project can look solid on paper, yet depend more on how it’s operated than on the hardware itself.
As campuses add technologies like geothermal heat pumps and thermal storage, the questions get tougher: how a ground loop balances loads over decades, how phased building conversions affect performance, or how to run steam and electric systems in sync with new assets.
These questions have big financial and operational implications. Historically, the answers have emerged only after years of operation, when changes are expensive. That’s where digital twins can make a measurable difference, allowing teams to test strategies and validate assumptions long before systems are built.
What digital twins do for campus energy plants
A digital twin is a detailed virtual replica of a university’s entire energy system. It not only encompasses equipment specifications and nameplate capacities, but also how everything operates together under varying conditions. Think of it as a flight simulator for campus energy infrastructure. Universities can use it to test changes, study potential failures, and optimize operations without touching real equipment or interrupting service.
Creating a digital twin begins with understanding how the campus operates—how operators utilize equipment, balance loads, and make day-to-day decisions in the central utility plant. Each major component is mapped into the model, then fine-tuned with real operating data pulled from the field (sub-hourly readings from chillers, heat pumps, boilers, ground loops, and distribution systems). That ongoing calibration is what sets a digital twin apart from conventional models, which can fall short in predicting whole-system performance.
The virtual system gets adjusted until it behaves like the real one. It responds to weather patterns, load demands, and control inputs the same way actual equipment does.
Once the model is calibrated, the digital twin becomes a safe space to experiment. Teams can test dispatch strategies to see what really drives efficiency without risking downtime. They can model equipment failures to identify weak points, simulate extreme weather to test system resilience, and test future upgrades to see how new equipment would interact with existing systems before committing to construction. All of it happens virtually, where every scenario adds insight instead of cost.
Problems digital twins solve and how quickly
Some problems get solved remarkably fast with a calibrated digital twin. Buildings not getting enough heating or cooling, energy costs exceeding projections, equipment working harder than necessary—these operational puzzles often get diagnosed within days. The model reveals what’s happening across the entire system instead of requiring operators to piece together clues from individual equipment readings and instinct.
Speed matters because inefficiencies compound quickly. A control sequence that inadvertently forces one chiller to work against another wastes energy every day until the problem is identified and fixed. Digital twins spot these conflicts by simulating current operations and revealing issues that aren’t obvious when examining equipment in isolation. Decisions made for one piece of equipment can ripple through the entire system, and the model makes those connections easy to see.
Equipment decisions get validated before purchase
Before spending millions on additional capacity, universities can verify that the addition is truly necessary. Does existing equipment need help, or does it just need better coordination? Could thermal storage shift loads more effectively? Does the planned equipment size match real-world conditions?
These questions get answered during the design phase. Since it’s early in the process, changing plans still means adjusting drawings rather than tearing out installed equipment.
Master planning gains decades of foresight
Beyond individual projects, digital twins also transform how universities approach long-term infrastructure planning. These studies take longer because they’re projecting performance over years or decades, but they provide confidence that simpler methods can’t match.
Universities can model proposed changes against 20 or 30 years of historical weather data, seeing how new systems would perform through heat waves and polar vortexes that might occur once or twice in a decade. Where will vulnerabilities emerge as campus loads change? How will aging equipment impact capacity over time? What happens if growth doesn’t follow projections? The model answers these questions before capital is committed, allowing universities to test strategies that would be too expensive or risky to try in the real world.
Unexpected benefits for campuses as a whole
One of the most valuable outcomes isn’t tied to any single problem the team sets out to fix. Operators often say the real benefit is how much more they understand their own energy systems. They start to see how interconnected everything is, and how a small change to one piece of equipment can shift the balance of the entire network in ways that aren’t obvious at first.
This systems-thinking perspective changes how universities approach operations. Instead of optimizing individual components in isolation, operators learn to consider ripple effects across the entire infrastructure. A control sequence that makes perfect sense for one asset might create unnecessary work for three others. Equipment that appears to be underperforming might be compensating for problems elsewhere in the system.
The knowledge gained lasts long after the initial modeling project ends. It leaves teams better equipped to troubleshoot future issues, evaluate new technologies, and make smarter decisions about equipment operation and capital investments.
Princeton’s multi-million dollar validation
Princeton University invested in a new geothermal heat pump plant designed to work in conjunction with existing infrastructure, including steam-fired chillers, electric chillers, another set of geothermal heat pumps in a second plant, thermal storage tanks, and boilers. Initial projections indicated they would need significant additional geothermal boreholes in the later phases of their energy transition, costing millions in capital investments.
Before starting the next phases of design and construction, Princeton had Salas O’Brien create a detailed digital twin of their main utility plants. The model was calibrated using sub-hourly data from all major components until it accurately reflected actual campus performance. Then, tests were conducted to simulate and assess various operational scenarios.
The model revealed something unexpected. Better asset dispatch and more harmonious control sequences could meet campus heating and cooling demands with fewer additional bores. The digital twin significantly lowered the capital costs for the next phase of their plant expansion
Meanwhile, a second issue was emerging. The planned transition of campus buildings switching from steam to hot water was going more slowly than initially planned. This could have resulted in less heat being drawn from the ground than the system was designed for. The ground would have begun to overheat, jeopardizing the long-term sustainability of the geothermal investment.
Engineers used the digital twin to test different methods for rebalancing the ground field without incurring high operational costs. The model predicted which strategies would succeed before any changes were made to the actual system. Both solutions—avoiding unnecessary expansion and rebalancing the ground field—were fully validated prior to implementation.
Getting started with a digital twin
Successful digital twin projects begin by identifying what decision you’re trying to make. Are you diagnosing why certain buildings aren’t getting proper heating or cooling? Is a planned equipment expansion necessary? Planning a multi-year transition to geothermal? The question determines how detailed the model needs to be, what data is most important, and how long the project will take.
Gather what already exists
Building a digital twin requires information that most campuses already have on hand. They’ll need as-built drawings of their central plants and distribution systems, documentation of current control sequences and dispatch strategies. Additionally, include any operational data regularly being collected, such as energy consumption, equipment runtime, temperature readings, and flow rates.
This documentation matters, but the most valuable resource is access to the engineers and operators who run these systems daily. They understand the quirks that drawings never capture: the valve that doesn’t quite close all the way, the building that always runs warmer than its setpoint, the control override that became permanent years ago due to some issue nobody quite remembers. This institutional knowledge is critical for building a model that reflects how the system operates rather than how it was designed to operate.
Expect collaboration, not just deliverables
Digital twin projects work best as collaborative efforts rather than studies, which universities commission and wait to receive. The process involves working together to define specific questions the model should answer, reviewing calibration results to verify the model behaves like the real system, and discussing findings as scenarios get tested.
Collaborations like this take time, due to their scale. But they produce better results because the people who will ultimately use the insights help shape how those insights get developed.
Timeline depends on complexity
Operational diagnostics move quickly, often producing useful findings within days once the model is calibrated and running. The model already accurately represents the system at that point, so identifying the cause of current problems becomes a matter of simulation and analysis rather than an extended study.
Master planning work takes longer because it involves testing multiple scenarios and projecting performance over years or decades of simulated operation. A study examining different equipment replacement strategies may take several weeks or months, depending on the number of scenarios that need evaluation. However, these complex studies still happen faster than traditional design-build-test methods, and they happen before capital is committed, rather than after construction reveals problems that require costly fixes.
How Salas O’Brien can help
When it comes to campus energy, the stakes are high and the variables are many. Our digital twin capabilities can give you a clearer view before committing resources, reducing your risk and building long-term confidence in every decision.
We’re the exclusive license distributor of TRNSYS, a modeling platform created at the University of Wisconsin in the 1970s and refined over decades. This is a high-fidelity platform with over 500 component models that simulate system performance on a minute-by-minute scale. We’ve spent decades improving this platform specifically for complex campus energy systems.
Whether you’re planning a geothermal system expansion, diagnosing operational issues, or making master planning decisions about equipment replacement, we help you test ideas and validate performance before committing capital.
Our experience spans projects from initial proof-of-concept work through ongoing operational support. We’ve built digital twins for systems ranging from 8 million square feet of geothermal heat exchange to complex multi-plant campuses with dozens of different asset types.
Reach out to our campus energy specialists at [email protected] or our contributor below to discuss how digital twin modeling can inform your next major energy infrastructure decision.
For media inquiries on this article, reach out to [email protected].
Jeff Thornton
Jeff Thornton is a leader in dynamic energy modeling and decarbonization with over 30 years of experience specializing in renewable energy systems and complex campus infrastructure. Jeff brings deep expertise in modeling and analyzing innovative energy systems, helping universities and organizations optimize performance, reduce carbon emissions, and make confident capital investment decisions. He has worked on award-winning projects including a solar district heating community that achieved the world’s first 90%+ annual solar fraction. Jeff serves as Senior Vice President at Salas O’Brien. Contact him at [email protected]