Heat recovery system

摘要: A plurality of flat tubes formed as a tube having notches by linearly cutting upper and lower parts from hollow circular doughnut shape are stacked to structure laminate. It is attached case so that notch aligns with the faces upward an exhaust inflow end plate downward outflow plate. cutoff valve provided at communication passing through center laminate heat insulation. While internal combustion engine warming up, closed cause flow in gaps respective whole also exchange medium caused have exchanged between recover heat.