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Hot surface ignition testing of low GWP 2L refrigerants.

Number: pap. 2448

Author(s) : KOBAN M., MINOR B., COUGHLAN P., et al.

Summary

The demand for environmentally sustainable substances is high. The number of low global warming (GWP) refrigerants entering the market is rapidly increasing to meet environmental needs. Many of the new low GWP refrigerants are “mildly flammable” or “2L” as classified by ISO 817 and ANSI/ASHRAE Standard 34 (ISO 2014, ASHRAE 2008). The new refrigerant flammability class provides the heating/air-conditioning/refrigeration industry more options to meet environmental regulations with equipment designed for low flammability refrigerants. Mildly flammable refrigerants are defined as refrigerants which have burning velocity (BV) less than 10 cm/sec and heat of combustion (HOC) less than 19,000 kJ/kg. Therefore, while these refrigerants are flammable, they are harder to ignite and potential events are less severe than class 2 or class 3 refrigerants. Understanding viable ignition sources are paramount in equipment design. A hot surface, which can be found in air conditioning auxiliary heaters and other refrigeration systems, is a relatively unexplored potential ignition source. Maximum hot surface temperatures are specified in various equipment standards. Recently, work was conducted to review potential ignition/non-ignition for seven different 2L refrigerants which were released onto a hot surface. Tests were designed to simulate a 2L refrigerant leak onto a hot surface within a piece of equipment or ductwork. In particular, individual refrigerants were released onto a round heated metal surface, and potential ignition was observed for a set period after the refrigerant was released. This study builds upon previous work where refrigerants were released onto hot surfaces at 800°C. In addition to ignition phenomena at higher elevated temperatures (825°C and 850°C), temperature profiles were recorded along with hot surface recovery time to better understand each refrigerant’s “impingement cooling capacity”.

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Pages: 8

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Details

  • Original title: Hot surface ignition testing of low GWP 2L refrigerants.
  • Record ID : 30018893
  • Languages: English
  • Source: 2016 Purdue Conferences. 16th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2016/07/11

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