Patent ID: 7644754

Claim:
A recuperator for transferring thermal energy from a warm gas flow to a cold gas flow, comprising: a first group of ducts with a first connection and a second connection; a second group of ducts with a third connection and a fourth connection, wherein the ducts of both groups extend mutually parallel; first supply means for supplying the cold gas flow to the first connection; first discharge means for discharging the cold gas flow from the second connection; second supply means for supplying the warm gas flow to the third connection; and second discharge means for discharging the warm gas flow from the fourth connection, wherein the device comprises alternating means for temporarily and repeatedly alternating connections from: the first supply means to the fourth connection; the first discharge means to the third connection; the second supply means to the second connection; and the second discharge means to the first connection: wherein the alternating means comprise two alternating valves located at opposite sides of the combination of the first and second group of ducts and control means for repeatedly changing the connections.