Patent ID: 6390183
Filing Date: 2002-05-21
Classification: F28D,F28F

Abstract:
A heat exchanger for exchanging heat between fluid flowing in a flow passage in a heat exchanger tube and fluid flowing outside of said heat exchanger tube, the flow passage including a first passage where fluid flows in a gas phase state, a second passage where fluid flows in the gas-liquid two phase state or liquid phase state, and a U-shaped passage separating the first and second passages, wherein an insertion member is not provided in the first passage where fluid flows in a gas phase state, but a solid bar-like insertion member or a hollow bar-like insertion member whose opposite ends are closed is provided in the second passage in which the fluid flows in the gas-liquid two phase state or liquid phase state, a cross section of said insertion member is formed into a substantially circle shape, a polygonal shape or a starlike shape, wherein fluid does not flow in the insertion member, and a cross-sectional area of a flow passage in which said fluid flows is reduced as a mass flow rate quality of said fluid is reduced.