A range of microchannel heat exchangers has been optimized for use with low density, low global warming potential (GWP) refrigerants like R-1234ze and R-515B.

The technology from Danfoss is intended to solve design challenges for OEMs transitioning to ultra-low GWP refrigerants, especially in large air-cooled chillers using screw and centrifugal compression.

The low density of these refrigerants typically makes system performance sensitive to pressure drops, the team at Danfoss notes. Due to the microchannel tube geometry, the Danfoss microchannel heat exchangers are said to provide a balance between maximum heat rejection and internal refrigerant pressure drop. According to the company, OEMs can realize a 20 percent reduction in refrigerant pressure drop at the component level. This may help some users transition more easily to low GWP, low density refrigerants.