Abstract: An air conditioner includes a header for introducing refrigerant into a plurality of refrigerant tubes provided in parallel in a vertical direction. The header includes a main header chamber extending in the vertical direction and a plurality of sub header chambers branched in the horizontal direction from the main header chamber and provided in parallel in the vertical direction. The main header chamber includes a refrigerant inlet port configured to introduce the refrigerant in a gas-liquid mixing state in a horizontal direction into an inside of the main header chamber; and a flow direction changing mechanism provided to collide with the refrigerant ejected from the refrigerant inlet port, and configured to change a flow direction of the refrigerant from the horizontal direction to the vertical direction.

Abstract: An air conditioner includes a header for introducing refrigerant into a plurality of refrigerant tubes provided in parallel in a vertical direction. The header includes a main header chamber extending in the vertical direction and a plurality of sub header chambers branched in the horizontal direction from the main header chamber and provided in parallel in the vertical direction. The main header chamber includes a refrigerant inlet port configured to introduce the refrigerant in a gas-liquid mixing state in a horizontal direction into an inside of the main header chamber; and a flow direction changing mechanism provided to collide with the refrigerant ejected from the refrigerant inlet port, and configured to change a flow direction of the refrigerant from the horizontal direction to the vertical direction.

Abstract: A corrosion protection performance degradation detection sensor includes a detection electrode that reacts with the corrosion inhibitor dissolved in the solvent and forms on a surface thereof an electrode surface film which inhibits corrosion, a counter electrode that is disposed so as to face the detection electrode, and an AC power supply that applies an AC voltage between the detection electrode and the counter electrode. A change in concentration of the corrosion inhibitor in the solvent is detected, on the basis of a change in impedance of the electrode surface film formed on the surface of the detection electrode.

Abstract: A corrosion protection performance degradation detection sensor includes a detection electrode that reacts with the corrosion inhibitor dissolved in the solvent and forms on a surface thereof an electrode surface film which inhibits corrosion, a counter electrode that is disposed so as to face the detection electrode, and an AC power supply that applies an AC voltage between the detection electrode and the counter electrode. A change in concentration of the corrosion inhibitor in the solvent is detected, on the basis of a change in impedance of the electrode surface film formed on the surface of the detection electrode.