A HEAT EXCHANGER

摘要

A heat exchanger ( 301, 501, 601 ) comprising a first tube ( 107, 507, 607 ) for fluid transmission and a second tube ( 108, 508, 608 ) for fluid transmission within a heat transfer system that uses a working fluid which undergoes compression and evaporation. The first tube is placed in thermal contact with the second tube for a portion ( 109,110 ) of the respective lengths of the first tube and the second tube so as to allow an exchange of heat between the fluid within said tubes. The first tube ( 107, 507, 607 ) is constructed from steel alloy which has alloyed components to reduce the hardness of the steel to facilitate tube bending within a heat transfer system, thereby allowing the first tube to be constructed from the steel within the heat transfer system, in preference to copper.