Why R-290 Is Gaining Popularity in Modern Refrigeration Systems

Sweeping changes to regulations on global commercial Heating, Ventilation, and Air Conditioning (HVAC) systems have begun. Simultaneously, international environmental standards are systematically restricting the use of high Global Warming Potential (GWP) synthetic hydrofluorocarbons (HFCs) and leading to the discontinuation of their use. 

As a consequence, design professionals and asset managers have begun re-evaluating the long-term plans for their business/country’s infrastructure. Natural refrigerants are the most promising solutions. 

Propane (R-290) refrigerants are the best solution for sustainable cooling systems. In order to enhance the system's cooling capabilities, modern purpose-built HVAC components will need to be designed to the thermal and flammable characteristics of hydrocarbon refrigerants.  

For MEP (mechanical, electrical and plumbing) professionals and government buyers, there is now a greater necessity to understand the safe and reliable use of R-290 in systems and how this refrigerant can help protect and sustain critical infrastructure.

The Technical and Environmental Case for R-290

The choice of R-290 refrigerants is due to their combination of mechanical performance and convenience. R-290 refrigerants are environmentally positive refrigerants with a Global Warming Potential of less than 1.

Compared to synthetic refrigerants like R-410A (GWP of 2,088), R-290 is the clear choice for cooling systems in F-Gas, AIM Act, and green procurement compliance, and is an excellent choice for low GWP refrigerants.

Propane refrigerants have good thermodynamic properties and cost advantages. R-290 has the best latent heat of vaporization and good thermal conductivity. Cooling equipment designed with R-290 refrigerants can have large energy savings. Designed and sized correctly, R-290 systems are 10 to 15 percent more energy efficient than HFC systems for the same operating conditions.

Using R-290 will help reduce the operating costs for your facility's electricity, making it very popular in commercial refrigeration and large commercial cold storage systems, as it offers many advantages. Using these advanced next-generation refrigerants will help your organization offer high-performance systems while achieving your decarbonization goals.

Engineering & Security Challenges: The SCIF and High-Security Imperative

R-290 is very effective from a thermal standpoint. When combined with its ASHRAE A3 classification of flammability, it requires a high degree of architectural safety consideration, particularly when used in or near mission-critical or highly secured areas. In the past, most facilities relied on A2L refrigerant options that have a moderate level of flammability. However, physical failure of an A2L refrigerant line break would require the implementation of large arrays of safety systems to ensure adequate ventilation. The use of A3 category refrigerants such as R-290 requires a high level of safety consideration, along with a factory-sealed, low-charge, and highly redundant containment of the refrigerant fluid lines.

Security Advisory for Facility Engineers: Unmonitored physical distribution routes and improper breaches of the perimeter represent a great concern for security compliance. Security personnel and MEP teams must ensure the current facility layouts do not contain the design flaws referenced in the security industry citation: SCIF HVAC warning signs; refrigerant lines violate ICD-705. This citation describes how lines that are uninsulated and improperly routed may result in the facility being decertified for compliance with the requirements of Intelligence Community Directive 705.

Because of these factors, R-290 chillers are now commonly placed on the building’s roof, or on the building’s outside walls, and are designed to chill directly without having to carry high-pressure refrigerant piping through secure and occupied spaces.

If a piping system fails, the refrigerant gas and any associated combustibility remain outside the building, ensuring the safety of building occupants and the facility as a whole.

Procurement and Maintenance Considerations for Directors

For government procurement officials and facility maintenance directors, moving toward green refrigeration technology requires a sizable shift in considering the impacts of lifecycle costs, permanent staff training, and supply chain disruptions. Federal policies dictate that agencies focus on the procurement of sustained, energy-efficient cooling systems; therefore, propane-based systems offer a straightforward solution for the improvement of the systems and structures of agencies.

Even with the aforementioned advantages, the use of hydrocarbon refrigerants in the HVAC/R systems calls for the following:

• Readiness Planning: Operations departments have to prepare for new training and specialized safety training regarding spark-free service tools, proper flammability mitigation, and certified refrigerant recovery protocols.

• Stock & Standards: Purchasing departments have to construct systems that provide certified infrastructure that meets local building codes, EPA SNAP rules, and updated UL safety standards. 

• Asset Viability: There is no risk of capital to risk by upgrading to natural refrigerants now, since there are no planned phase-outs of these refrigerants for decades. 

Securing High-Security Infrastructure with R-290 

Moving toward R-290 is a permanent change in refrigeration engineering. The incorporation of superior thermodynamic efficiency and environmental responsibility places propane firmly at the beginning of environmentally sustainable refrigeration technology. The business case is clear for both commercial and defense assets: reduced utility systems, complete insulation from future chemical phase-outs, and a significantly reduced environmental impact.

The installation of these systems means that physical asset protection must be taken extremely seriously. Engineering teams must use automated, fast-acting isolation valves, complete leak detection systems, and systems mounted externally to address the mechanics of a high-pressure refrigerant line break. 

Using a qualified non-conductive refrigerant line break coupling or a dielectric isolation sleeve at the perimeter of the structure means that line systems can’t carry stray electrical currents to ground and can’t compromise the physical and electrical grounding of high-security systems.

Facilities can today take full advantage of the R-290’s fantastic operational benefits using intelligent designs, rapid procurement, and safety standard enforcement and still maintain full structural protection.