Patent ID: 6450244
Filing Date: 2002-09-17
Classification: F28D

Abstract:
An air-to-air heat exchanger for use with a building defining an inside and an outside and having a ventilation system including an air exhaust line for discharging stale air from inside and an air supply line for receiving fresh air from the outside, the heat exchanger comprising:first and second heat exchange banks, each of the heat exchange banks including at least one heat exchange module and defining a flow path having oppositely disposed first and second ends, each of the heat exchange modules including a heat exchange mass; and at least a first damper module, each damper module including a damper disposed within a substantially rectangular housing having four sides defining first, second, third, and fourth ports, the damper being periodically reciprocated between first and second positions, the first port of the first damper module being adapted for connection to the air exhaust line, the second port of the first damper module being adapted for connection to the air supply line, the third port of the first damper module being connected to the first end of the first heat exchange bank, and the fourth port of the first damper module being connected to the first end of the second heat exchange bank, the damper of the first damper module directing air flow between the first port and the third port and between the second port and the fourth port in the first position, the damper of the first damper module directing air flow between the first port and the fourth port and between the second port and the third port in the second position; wherein the heat exchanger is adapted for installation anywhere on or within the building and the second end of each heat exchange bank is adapted for connection to the outside whereby substantially no stale air is drawn into the air supply line when the damper is reciprocated.