Heat exchanger

Abstract

Abstract PURPOSE:To increase the heat absorption capacity per unit time of evaporator when operating under low outside temperature conditions by a constitution in which heat transmission pipes carrying cooling medium in them are arranged in a row in the air flow direction, fins being perpendicuarly attached to them, and selecting the fin configuration such that its front half relative to the air flow is made flat and the rear half corrugated. CONSTITUTION:By making the front half of the fins relative to the air flow where the frost growth is most severe at the time of heating operations flat 14, the vertical distance between the adjacent fins can be made greater. Also, on account of a reduction in the draft resistance due to the increased air flow speed, the frost growth on the flat area 14 can be lessened. Because of the afore-said two effects, the time interval in which the heat exchanger is covered with frost can be made longer, improving the heat exchanging capacity per unit time. By adopting a corrugated shape 15 for the rear half, the dead space behind the heat transmission pipes 11 can be reduced, improving the heat transfer. In addition, the increased air flow speed due to the reduction in the draft resistance improves the heat exchanging performance, and the heat exchanging quantity when not covered with frost becomes equal to that which could be obtained when the fins are entirely corrugated.

Inventors

• 👤 Hiroaki Kase
• 👤 Hachiro Koma
• 👤 Koichi Nakayama
• 👤 Hiroaki Suga

Bibliographic Details