PURPOSE: To reduce pressure loss of refrigerant and passing air and to improve heat exchanging efficiency by setting the thickness of a tube, pitch of parallel parts of adjacent tubes, and the ratio of the pitch of partition walls in the tube to the thickness of the tube to specific ranges.
CONSTITUTION: Porous flat tubes 1, 2 bent in a zigzag state are formed with corrugated fins 3 interposed between adjacent parallel parts 1a and 2a, with a plurality of refrigerant passages (a) therein and with a plurality of refrigerant passages (c). Refrigerant fed from a refrigerant inlet tube 6 is branched at an upper connection pipe 4 into two tubes 1, 2, and the refrigerants passed through the tubes 1, 2 are combined at a lower connection pipe 5, and discharged externally from a refrigerant outlet tube 7. The thickness Tt of the tube is set to 2-4mm, the pitch Pt of the parallel parts of the adjacent tubes is set to 7-20mm, and the ratio of the thickness Tt of the tube to the pitch P2 of the partition walls in the tube is set to 0.6-1.5.
SASAKI HIRONAKA
WATANABE HIROHIKO
| JPH01137174A | 1989-05-30 |