Heat exchanger for internal combustion engine, comprises parallel passages for cooling water/exhaust gas and fins in the exhaust gas passage which are more widely spaced downstream

摘要

Exhaust gases enter the heat exchanger at an entry (141) and leaves at an exit (142). Cooling water enters through a pipe (151) and leaves through a second pipe (152). The exhaust gases and cooling water pass along parallel interleaved passages and the exhaust gas channels contain fins (111) to aid heat transfer. The fins are more widely spaced downstream than upstream but not more than twice as widely spaced.