Patent ID: 11965701
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A heat exchanger, comprising:
a plurality of fins arranged in parallel to each other; and
a plurality of heat transfer pipes each extending in a direction intersecting the plurality of fins,
in a plane perpendicular to a direction in which the plurality of heat transfer pipes extend, the plurality of heat transfer pipes being placed in a plurality of rows in a row direction that is along a direction of airflow at a row pitch L1,
in the plane, the plurality of heat transfer pipes being placed in a plurality of steps in a step direction perpendicular to the row direction at a step pitch L2,
where an outer diameter of each of the plurality of heat transfer pipes is defined as Do,
a wall thickness of a portion having a smallest distance between an outer wall surface and an inner wall surface of each of the plurality of heat transfer pipes is defined as tP,
an area represented by a numerical expression of L1×L2 is defined as A, and
an area represented by a numerical expression of ((Do−2×tP)/2)2×π is defined as B,
a relation of Do<5.5 mm,
a relation of (0.2076×tP2−0.1480×tP+0.0545)×Do{circumflex over ( )}(−0.0021×tP2−0.0528×tP+0.0164)≤B/A≤(0.0219×tP2−0.0185×tP+0.0043)×ln (Do)+(1.6950×tP2+1.8455×tP+1.5416), and
a relation of B/A<0.0076×tP2−0.0417×tP+0.0574
being satisfied.