Heat exchanger having a bundle of closely spaced tubes and a boiler thus equipped

摘要

The invention relates to a device for exchanging heat between a first heat-exchange fluid circulating in a bundle of closely spaced and mutually parallel tubes (10) having constricted end portions (12, 13) inserted into two support plates (20, 30), and a second heat-exchange fluid circulating outside the tubes, between the plates. Application to central heating boilers of the condensation type. <IMAGE>