Evaporator

An evaporator comprising:

• a plurality of heat exchange tubes extending vertically and arranged in rows spaced apart from each other in a front-rear direction,
• wherein a drainage acceleration member extending vertically is disposed between the adjacent front and rear heat exchange tubes, a drain channel is formed between the front heat exchange tube and the drainage acceleration member and between the rear heat exchange tube and the drainage acceleration member, the heat exchange tubes are flat and are arranged such that a width direction thereof coincides with the front-rear direction, the thickness of the drainage acceleration member as measured in the left-fight direction is equal to the thickness of the heat exchange tube as measured in the left-fight direction, a gap is present between at least one of the two adjacent front and rear heat exchange tubes, and the drainage acceleration member disposed between the two heat exchange tubes;
• the gap serves as the drain channel;
• and a relation 0<w/h≦¼ is satisfied, where h (mm) is the thickness of the heat exchange tube and the thickness of the drainage acceleration member as measured in the left-fight direction, and w (mm) is the width of the drain channel as measured in the front-rear direction.

An evaporator comprising:

• a plurality of heat exchange tubes extending vertically and arranged in rows spaced apart from each other in a front-rear direction,
• wherein a drainage acceleration member extending vertically is disposed between the adjacent front and rear heat exchange tubes, a drain channel is formed between the front heat exchange tube and the drainage acceleration member and between the rear heat exchange tube and the drainage acceleration member, the heat exchange tubes are flat and are arranged such that a width direction thereof coincides with the front-rear direction, the thickness of the drainage acceleration member as measured in the left-fight direction is equal to the thickness of the heat exchange tube as measured in the left-fight direction, at least one of the two adjacent front and rear heat exchange tubes, and the drainage acceleration member disposed between the two heat exchange tubes are in contact with each other, a recess is formed between the drainage acceleration member and the heat exchange tube in contact with the drainage acceleration member in such a manner as to be depressed inward with respect to the left-fight direction from an extension surface of a left side surface of the heat exchange tube and to extend vertically, a recess is formed between the drainage acceleration member and the heat exchange tube in contact with the drainage acceleration member in such a manner as to be depressed inward with respect to the left-right direction from an extension surface of a right side surface of the heat exchange tube and to extend vertically, he recesses serve as the drain channels, and a relation 0.05≦S/h≦1.5, is satisfied, where S (mm2) is the cross-sectional area of the drain channel, and h (mm) is the thickness of the heat exchange tube and the thickness of the drainage acceleration member as measured in the left-right direction.

An evaporator comprising:

• a plurality of heat exchange tubes extending vertically and arranged in rows spaced apart from each other in a front-rear direction,
• wherein a drainage acceleration member extending vertically is disposed between the adjacent front and rear heat exchange tubes, a drain channel is formed between the front heat exchange tube and the drainage acceleration member and between the rear heat exchange tube and the drainage acceleration member, the heat exchange tubes are flat and are arranged such that a width direction thereof coincides with the front-rear direction, the thickness of the drainage acceleration member as measured in the left-right direction is equal to the thickness of the heat exchange tube as measured in the left-right direction, outer surfaces of end walls of the front and rear heat exchange tubes in opposition to the drainage acceleration member have an arcuate horizontal cross section, whereas front and rear end surfaces of the drainage acceleration member are flat surfaces perpendicular to left and right side surfaces of the heat exchange tubes;
• alternatively, the outer surfaces of end walls of the front and rear heat exchange tubes in opposition to the drainage acceleration member are flat surfaces perpendicular to the left and right side surfaces of the heat exchange tubes, whereas the front and rear end surfaces of the drainage acceleration member have an arcuate horizontal cross section.

An evaporator comprising:

• a plurality of heat exchange tubes extending vertically and arranged in rows spaced apart from each other in a front-rear direction,
• wherein a drainage acceleration member extending vertically is disposed between the adjacent front and rear heat exchange tubes, a drain channel is formed between the front heat exchange tube and the drainage acceleration member and between the rear heat exchange tube and the drainage acceleration member, the heat exchange tubes are flat and are arranged such that a width direction thereof coincides with the front-rear direction, the thickness of the drainage acceleration member as measured in the left-right direction is equal to the thickness of the heat exchange tube as measured in the left-right direction, outer surfaces of end walls of the front and rear heat exchange tubes in opposition to the drainage acceleration member have a V-shaped horizontal cross section, whereas front and rear end surfaces of the drainage acceleration member are flat surfaces perpendicular to left and fight side surfaces of the heat exchange tubes;
• alternatively, the outer surfaces of end walls of the front and rear heat exchange tubes in opposition to the drainage acceleration member are flat surfaces perpendicular to the left and right side surfaces of the heat exchange tubes, whereas the front and rear end surfaces of the drainage acceleration member have a V-shaped horizontal cross section.