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Steam Heating System vs. Low-Temperature Hot Water System

As energy systems evolve to meet modern demands for efficiency, sustainability, and cost-effectiveness, the shift from traditional steam heating to low-temperature hot water (LTHW) systems has gained attention. Many older buildings and industrial facilities still rely on steam heating, which, though effective, can be inefficient, costly, and unsafe. Transitioning to LTHW systems offers significant benefits in energy efficiency, cost savings, maintenance, and overall performance.

Meeting that demand requires a clear understanding of the technologies reshaping the industry and how to apply them in the real world. We’ve identified several emerging technologies that should be on every Facility Manager’s radar. We’ve categorized them by their primary impact: Energy and Operations.

January 15, 2025
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Piloting the Future of Campus Operations: Emerging Technologies for the Modern Campus

PART 1: ENERGY

Building-Integrated Photovoltaics (BIPV)

A new form of solar panels is officially entering the US market, offering a more aesthetically pleasing alternative to traditional rooftop solar. The European company Roofit.Solar focuses on a technology called building-integrated photovoltaics (BIPV), where the roofing material itself is the solar panel. These integrated systems minimize visual impact, which is often a consideration for historic buildings or aesthetically sensitive campuses.

Air Source Heat Pumps (ASHP)

Heat pump technology has undergone a significant transformation, overcoming past performance limitations, especially in colder climates. Recent studies, such as those conducted by organizations like the National Renewable Energy Laboratory (NREL), confirm their viability and efficacy even in regions with harsh winters, making them a crucial technology for decarbonization efforts nationwide.

Geo-exchange / Groundsource Heat Pumps (GSHC)

Geo-exchange (or ground source heat pump) systems remain one of the most effective ways to heat and cool facilities using the stable temperature of the earth, providing high-efficiency heating/cooling regardless of external weather conditions. The financial viability of these systems has been significantly boosted by the continued availability of federal and state tax credits, which can substantially lower the first-cost hurdle, making the long-term ROI even more attractive. Innovation in this area focuses on optimizing the drilling process and improving heat transfer efficiency to reduce installation costs and land usage. For instance, Minnesota-based Darcy Solutions has pioneered "turbo-charging" mechanisms that utilize the high thermal conductivity of moving groundwater. By drawing heat from an aquifer rather than static soil, these systems allow for significantly fewer wells to achieve the same energy output, maximizing efficiency while minimizing site disruption.

PART 2: OPERATIONS

Open-Standard Intelligent Controls

The next generation of Building Automation Systems (BAS) is moving toward smarter, more flexible control architectures. New, non-proprietary controllers, such as those utilizing the EnOcean standard, are entering the market, offering a cheaper and more adaptable alternative to complex, expensive proprietary BAS. While the EnOcean standard itself does not incorporate artificial intelligence (AI), this shift gives facility managers more freedom in system configuration, allowing them to leverage AI and machine learning capabilities to control systems through a smart server. This setup allows for the autonomous reconfiguration of system points and optimization of performance, constantly fine-tuning a building's operation for peak efficiency and minimal energy waste.

Fault Detection and Diagnostics (FDD) Platforms

The next step beyond intelligent controls is using data analysis to constantly monitor and diagnose the operational health of your building portfolio. These platforms connect directly to your existing Building Automation System (BAS) to continuously ingest real-time operational data (e.g., temperatures, setpoints, valve positions, equipment runtimes, etc.). For example, a platform like ClockWorks utilizes proprietary FDD algorithms to automatically detect and diagnose operational faults and inefficiencies, turning raw data into opportunities for low-cost or no-cost corrections.

Smart Lock Cylinders

These modern systems replace traditional keyways with battery-powered mechanisms, providing detailed audit trails and simplifying access control for staff and visitors. Cutting-edge systems now explore "direct line of sight" non-connected power charging, eliminating the need for complex hardwiring at every door. 

3D Scanning for As-Built Documentation

Capturing accurate "as-built" conditions for existing facilities has traditionally been a time-consuming and expensive process, often involving professional surveying or manual measurements. Tools like Polycam (a mobile and desktop application) are democratizing this process by leveraging LiDAR and photogrammetry capabilities found in modern smartphones and tablets. The SHG team can partner with your facilities staff to rapidly scan rooms, entire floors, or building exteriors to generate accurate, georeferenced 3D models and 2D floor plans. This allows for near-instantaneous documentation of spaces for renovation planning, capital project management, and simply maintaining a digital twin of the campus.

Is Your Campus Ready for a Pilot?
  • Electrification Potential: Low-temperature hot water (LTHW) systems are efficiently powered by electric heat pumps, which are cost-effective and environmentally friendly. Unlike steam systems, which typically rely on fossil fuels like natural gas, low-temperature hot water systems can seamlessly integrate with renewable energy sources, such as solar or wind power.
  • Heat Recovery Opportunities: LTHW systems integrate well with heat recovery technologies. In many industries and commercial buildings, heat that would otherwise be wasted from chilled water generation systems can be transferred to the hot water system, reducing the need for additional energy input.
  • Lower Installation and Insulation Costs: LTHW systems operate at much lower temperatures (generally between 50°C and 70°C), which allows for thinner, less expensive pipes and reduced installation complexity. The reduced need for high-pressure equipment and insulation results in lower upfront capital costs.
  • Lower Heat Loss: LTHW systems have lower heat loss due to well-insulated pipes and radiators, making them more efficient and cost-effective to operate over the long term compared to steam systems.
  • Lower Maintenance Costs: LTHW systems are simpler and require less maintenance. With fewer components and no high-pressure systems, they incur lower costs than steam systems. Additionally, the lower temperatures involved reduce the wear and tear on components, leading to fewer breakdowns and less frequent repairs.
  • Improved Efficiency: LTHW systems are more efficient, operating at lower temperatures and adjusting in real-time to avoid energy wastage, unlike steam systems which suffer from heat losses.
  • Reduced Space Requirements: LTHW systems require less space, making them ideal for buildings with limited room.
  • Safety Improvements: LTHW systems are safer due to reduced pressure and temperature. The absence of high-pressure components minimizes the risk of explosions or leaks. Furthermore, because the system operates at lower temperatures, the risk of burns or scalding is also reduced.
  • Improved Temperature Control: LTHW systems provide more precise temperature control based on facility demand, ensuring accurate heating, unlike steam systems which can be difficult to regulate due to the nature of steam’s phase changes.
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Source:

Wilson, E. J. H., Munankarmi, P., Less, B. D., Reyna, J. L., & Rothgeb, S. (2024). Heat pumps for all? Distributions of the costs and benefits of residential air-source heat pumps in the United States. Joule, 8(4), 1000–1035. Link: https://docs.nlr.gov/docs/fy24osti/84775.pdf

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