Identifying Ideal Applications for Performance and Efficiency
As HVAC systems evolve to meet increasingly demanding energy codes and sustainability goals, chilled beams are emerging as a compelling solution. Their popularity is driven by their ability to deliver long-term energy savings, reduce duct sizing, lower noise levels and minimize maintenance requirements.
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| Chilled beams installed at the HMFH Architects office in Cambridge, MA (photo by Ed Wonsek) |
These systems offer significant energy savings, improved indoor air quality and reduced mechanical footprints. But when is a chilled beam system the right choice?
A key metric to guide this decision is the sensible heat ratio (SHR): the proportion of sensible cooling load to total cooling load. When the SHR is high, chilled beams perform exceptionally well, making them an ideal choice for many modern building applications. In this post, we’re exploring how the SHR influences chilled beam performance, what transfer efficiency means and which applications benefit most from this technology.
Understanding Sensible Heat Ratio
Active chilled beams combine hydronic cooling with air induction to efficiently manage sensible loads. When determining whether a chilled beam system is appropriate for a given space, the SHR can be used to help quantify how much of the cooling demand in a space is due to temperature control (sensible load) versus moisture removal (latent load). Since chilled beams are designed to handle sensible loads only, understanding the SHR is essential for proper system selection and performance optimization.
The SHR is calculated using the following formula:
A high SHR, typically above 0.7, indicates that the majority of the cooling demand is sensible, making chilled beams a highly effective solution. ASHRAE recommends applying chilled beams in spaces where the latent load is minimal or decoupled from the primary air system. In environments with lower SHR values, additional systems, such as dedicated outdoor air systems (DOASs), are required to manage humidity and maintain indoor air quality.
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| The sensible heat ratio wheel; SHR values above 0.7 indicate that most of the cooling demand is sensible |
The Importance of Transfer Efficiency
In high SHR environments, chilled beams not only become viable but also operate more efficiently. This is where transfer efficiency becomes an important supporting factor. Transfer efficiency refers to how effectively heat is exchanged between the room air and the chilled beam coil per unit of primary air supplied. Active chilled beams rely on induction, where primary air is discharged through nozzles at a high velocity, creating a low-pressure zone that pulls room air across the coil. The mixed air is then distributed back into the space, delivering cooling or heating.
When the SHR is high, smaller nozzle sizes can be used, which increases induction and improves transfer efficiency. This results in better thermal comfort, quieter operation and reduced energy consumption. Optimizing transfer efficiency also allows chilled beams to deliver strong performance with lower airflow, reducing fan energy and the size of the mechanical system.
There are a few important elements to consider when designing a chilled beam system:
- Humidity Control: Keep the chilled water supply above the room dew point to prevent condensation and use a DOAS for latent load management.
- Airside Load Fraction: Lower fractions favor hydronic systems for efficiency and reduced airflow.
- Ductwork Integrity: Ensure Class A duct sealing to maintain induction performance.
- System Integration: Coordinate with architectural and automation systems early for optimal layout and aesthetics.
Ideal Applications Based on SHR
Chilled beam systems are well suited to many types of applications, and the SHR can help determine the best fit.
Commercial Office Buildings
Office environments typically exhibit high SHRs (greater than 0.8), making them an excellent fit for chilled beam systems. These spaces benefit from predictable occupancy and minimal humidity concerns. Chilled beams reduce fan energy and ductwork size, allowing for higher ceilings and quieter operation, which is particularly ideal for open-plan layouts and collaborative workspaces.
Educational Facilities
Classrooms and lecture halls often have moderate to high SHRs (greater than 0.75), especially when humidity is managed separately. These spaces require low noise levels and good indoor air quality, which are criteria that chilled beams meet exceptionally well. Chilled beams reduce reheat energy and improve comfort, supporting sustainability goals for campuses.
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| With their ability to deliver precise temperature control without excessive airflow, chilled beams are an excellent choice for laboratories |
Laboratories
Labs often have high SHRs (greater than 0.8) due to equipment-driven sensible loads and controlled humidity. Chilled beams excel by reducing fan power and simplifying air treatment, delivering precise temperature control without excessive airflow, which is critical for research and healthcare environments. Additionally, chilled beams substantially reduce or eliminate the need for reheat, which is common in traditional air systems, resulting in significant energy savings and improved system efficiency.
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| A chilled beam installed in a patient room at Memorial Hospital and Health Care Center in Jasper, IN (photo by BC Baggett) |
Healthcare Facilities
Hospitals and clinics demand strict indoor air quality, infection control and patient comfort. They have a high SHR (typically greater than 0.8). Chilled beams are a strong choice in these environments because they handle sensible cooling while a DOAS manages ventilation and humidity separately. This approach allows the system to cut primary air volume significantly, reducing energy use while maintaining quiet, comfortable patient spaces.
Hotels and Dormitories
Sleeping areas typically have favorable SHR values (greater than 0.75). Chilled beams provide quiet, unobtrusive temperature control, enhancing occupant comfort and sleep quality. Their ceiling-mounted design saves floor space and reduces maintenance, making them ideal for hospitality and student housing.
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| Referring back to our sensible heat ratio wheel, offices, labs and healthcare facilities often have SHR values greater than 0.8 (left), whereas educational facilities, hotels and dorms often have SHR values greater than 0.75 | |
Chilled beams are a smart choice for buildings with high SHRs and a focus on energy efficiency, comfort and sustainability. By understanding SHR and transfer efficiency, engineers can design systems that are not only high performing but also cost effective and future ready.
Whether you’re working on an office, school, hospital, lab or hotel, chilled beams can transform your HVAC strategy. For more information on how you can use chilled beams in your next project, visit our website or reach out to the Sustainable Systems team at Sustainable@priceindustries.com.
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Victoria Harper is an Applications Engineer with the Sustainable Systems team at Price. She is based out of Price's Crestridge facility in Suwanee, GA. Click here to connect with her on LinkedIn. |
