HEAT EXCHANGER

PROBLEM TO BE SOLVED: To provide a micro-tube heat exchanger capable of realizing the optimum and high heat exchanging performance and achieving the sufficient heat exchanging quantity, even when the parallel flow type or serpentine type micro-tube heat exchanger is used as an evaporator or a condenser. SOLUTION: The number of refrigerant passage holes is reduced and the cross-sectional area of a refrigerant passage is increased as going from a leeward side to a windward side in a flat pipe, whereby heat transfer performance to an air side through fins closely kept into contact with the flat pipe, from the refrigerant can be improved, and the heat exchanging effect can be improved. The windward-side heat exchanger and the leeward-side heat exchanger can be effectively utilized with good balance, even when the heat exchangers are used as the evaporator or the condenser, whereby the performance can be maximized. COPYRIGHT: (C)2005,JPO&NCIPI