Fin of heat exchanger, heat exchanger, and air conditioning apparatus
A fin for a heat exchanger of an air conditioning apparatus includes a base material, a hydrophilic layer, and a corrosion-resistant layer provided between the base material and the hydrophilic layer. A contact angle of a surface of the hydrophilic layer with water is no more than 50 degrees. A water content of the hydrophilic layer per dm 2 of the surface of the hydrophilic layer being at least 60 mg/dm 2 and no more than 300 mg/dm 2 .
1. A fin for a heat exchanger of an air conditioning apparatus, the fin comprising:
a base material;
a hydrophilic layer; and
a corrosion-resistant layer provided between the base material and the hydrophilic layer;
a contact angle of a surface of the hydrophilic layer with water being no more than 50 degrees; and
a water content of the hydrophilic layer per dm 2 of the surface of the hydrophilic layer being at least 60 mg/dm 2 and no more than 300 mg/dm 2 ,
the water content being a value obtained by immersing a bottom end of the fin into 1 mm or more of water, recording a mass of the fin when immersed as an initial mass submerging the fin in a predetermined depth of water and leaving the fin submerged for fourteen hours, finding a difference between the initial mass and the mass measured thirty seconds after returning the fin to a position where the initial mass was measured, and dividing the difference by the surface area.
2. The fin of a heat exchanger according to claim 1 , wherein
the contact angle of the surface of the hydrophilic layer with water is no more than 30 degrees.
3. The fin of a heat exchanger according to claim 1 , wherein
a film thickness of the hydrophilic layer is at least 0.1 μm and no more than 10 μm.
4. The fin of a heat exchanger according to claim 1 , wherein
the hydrophilic layer includes, as a coating film forming component, one of:
a polymer configured from a monomer having one or at least two hydrophilic functional groups selected from a group consisting of a carboxylic acid group, a sulfonic acid group, a hydroxy group, an amide group, and an ether bond;
a copolymer including the monomer; and
a mixture of the polymer and the copolymer.
5. A heat exchanger including the fin according to claim 1 .
6. An air conditioning apparatus including the heat exchanger according to claim 5 , the air conditioning apparatus further comprising:
a fan configured to blow air at the heat exchanger;
a compressor; and
a control unit configured to perform thermo-otf operation control to drive the fan while driving of the compressor has been stopped.
7. A heat exchanger including the fin according to claim 2 .
8. An air conditioning apparatus including the heat exchanger according to claim 7 , the air conditioning apparatus further comprising:
a fan configured to blow air at the heat exchanger;
a compressor; and
a control unit configured to perform thermo-off operation control to drive the fan while driving of the compressor has been stopped.
9. A heat exchanger including the fin according to claim 3 .
10. An air conditioning apparatus including the heat exchanger according to claim 9 , the air conditioning apparatus further comprising:
a fan configured to blow air at the heat exchanger;
a compressor; and
a control unit configured to perform thermo-off operation control to drive the fan while driving of the compressor has been stopped.
11. A heat exchanger including the fin according to claim 4 .
12. An air conditioning apparatus including the heat exchanger according to claim 11 , the air conditioning apparatus further comprising:
a fan configured to blow air at the heat exchanger;
a compressor; and
a control unit configured to perform thermo-off operation control to drive the fan while driving of the compressor has been stopped.