US Patent 7814966 Variable flow heat exchanger system and method

A heat exchanger system is provided including a first and second heat exchanger each configured to pass air therethrough. The second heat exchanger is mounted upstream of the first heat exchanger. The second heat exchanger may be selectively movable between a first position and a second position such that an amount of the air is diverted from the second heat exchanger to the first heat exchanger when the second heat exchanger is in the first position. Alternately, the second heat exchanger may be spaced from the first heat exchanger, with at least one selectively openable shutter mounted adjacent to the first and second heat exchangers. The at least one shutter is movable between a first position and a second position such that an amount of the air is diverted from the second heat exchanger to the first heat exchanger when the at least one shutter is in the first position.