Fluoroketone C2F5C(O)CF(CF3)2 as a Heat Transfer Fluid for Passive and Pumped 2-Phase Applications

• Published in: 2008 Twenty-fourth Annual IEEE Semiconductor Thermal Measurement and Management Symposium pp. 173 - 179
• Main Author: Tuma, P.E.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01-03-2008
• Subjects: 2-phase; C 2 F 5 C(O)CF(CF 3 ) 2; C 3 F 7 C(O)C 2 F 5; Conducting materials; Corrosion; datacenter cooling; fluoroketone; Global warming; GreenChill; GreenGrid; Guidelines; Hybrid fiber coaxial cables; hydrofluoroether; hydrofluoroolefin; immersion cooling; Inorganic materials; Kyoto Protocol; liquid cooling; Materials testing; Public Law 109-431; pumped liquid multiphase; pumped refrigerant; Pumps; Sealing materials; Thermal conductivity; thermosyphon; transformer cooling
• ISBN: 1424421233; 9781424421237
• ISSN: 1065-2221; 2577-1000
• DOI: 10.1109/STHERM.2008.4509386

C 2 F 5 C(O)CF(CF 3 ) 2 , a new Fluoroketone (FK) working fluid with an atmospheric boiling point of 49degC and Global Warming Potential (GWP) ~1, is proposed as an alternative to Perfluorocarbons (PFCs) and hydrofluorocarbons (HFCs) for passive and pumped 2-phase systems. Its thermophysical properties are very similar to those of the PFC C 6 F 14 C 2 F 5 C(O)CF(CF 3 ) 2 exhibits low acute toxicity and bears a recommended 8-hour exposure guideline of 150 ppmv. Pool boiling experiments conducted with a porous metallic boiling enhancement at P atm showed h>8 W/cm 2 -K at >30 W/cm 2 . Metal corrosion and elastomer compatibility testing show the material to be very inert. 120 hour thermal stability tests conducted with C 2 F 5 C(O)CF(CF 3 ) 2 at 230degC in sealed glass ampules with copper and aluminum coupons showed purity changes -0.02%. It will hydrolyze in the presence of a separate water phase and the implications of this incompatibility for water-cooled systems require further investigation.