US 11,885,575 B2
Heat exchanger, method for manufacturing heat exchanger, and refrigerant cycle apparatus
Debukuma-ru Mondaru, Osaka (JP); Tomohiro Nagano, Osaka (JP); Hirokazu Fujino, Osaka (JP); Ken Satou, Osaka (JP); Kiyotaka Toyoyama, Osaka (JP); and Takuya Ukai, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Nov. 2, 2022, as Appl. No. 17/979,253.
Application 17/979,253 is a continuation of application No. PCT/JP2021/019480, filed on May 21, 2021.
Claims priority of application No. 2020-089353 (JP), filed on May 22, 2020.
Prior Publication US 2023/0063016 A1, Mar. 2, 2023
Int. Cl. F28F 13/18 (2006.01); F25B 39/02 (2006.01); F28F 1/32 (2006.01)
CPC F28F 13/18 (2013.01) [F25B 39/02 (2013.01); F28F 1/32 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A heat exchanger comprising:
a water-repellent coating film on part of a surface of the heat exchanger, wherein
the surface on which the water-repellent coating film is disposed comprises a surface structure comprising protrusions,
D/L<0.36,
D/L>0.4×(L/H),
D<200,
L−D<1000,
H>700,
0>1.28×D×10−2+2.77×(L−D)×10−3−1.1×D2×10−5−5.3×(L−D)2×10−7−9.8×D×(L−D)×10−6 −2.0, and
90°<θ<120°, where
L is an average pitch of the protrusions in nm,
D is an average diameter of the protrusions in nm,
H is an average height of the protrusions in nm, and
θ is a contact angle of water on a smooth plane of the water-repellent coating film.