Supporting Program 2018
ADVANTAGES OF INFRARED SENSORS FOR REFRIGERANT LEAK DETECTION IN THE COMMERCIAL/INDUSTRIAL HVACR SECTOR
Specification requirements for A2L refrigerants, including refrigerant sensor requirements such as response time and measurement ranges, are expected to be introduced or revised on the following standards: • International Standard IEC 60335-2-40: Household and similar electrical appliances – Particular requirements for electrical heat pumps, air conditioners, and dehumidifiers (Edition 5.1, April 2016) • ASHRAE Standard 15-2016: Safety Standard for Refrigeration Systems • International Organization for Standardization (ISO) 5149-3:2014 Refrigerating systems and heat pumps – Safety and environmental requirements Over the past few years, low-GWP HFCs and HFOs, have been developed to replace the HFCs currently in use. Several of these proposed refrigerants fall into an ASHRAE safety category created in ASHRAE Standard 34-2010: Designation and Safety Classification of Refrigerants, A2L. A2L refrigerants are a sub-class of A2 (i.e., lower flammability). As a result, codes and standards will require the use of sensors to detect a refrigerant leak for both commercial/industrial and residential applications to mitigate the potential for a combustible event. Infrared technology, already widely used in industrial and commercial settings, satisfy many of the proposed required criteria for A2L sensors. IR main advantages lies in greater gas selectivity, low humidity and temperature dependence and long stability and expected lifetime, when compared to other available technologies. They are believed to be more than capable of detecting leaks within the anticipated alarm ranges without falsely-triggering on typical pollutants present in residential or commercial environments. IR sensors are also not anticipated to be susceptible to many failure modes in both residential and commercial/industrial applications. Their cost is however the major inhibitor to use and the industry is in fact in a drive to reduce them.
--- Date: 17.10.2018 Time: 12:00 - 12:20 Location: Hall 9, stand 9-531