Displacement ventilation systems having integrated heat exchangers with heat conductive air filtration substrates

A displacement ventilation system for a room comprising:

• a first duct located inside said room and being positioned against a wall of said room;
• an air inlet coupled with said first duct for drawing fresh, outside air into said displacement ventilation system;
• an elongated diffuser extending adjacent a floor of said room and being coupled with said first duct for diffusing at least some of the fresh, outside air over the floor of said room;
• a return air duct extending adjacent a ceiling of said room and being coupled with said first duct for removing return air located near the ceiling from said room and advancing the return air toward said first duct;
• a heat exchanger located between said air inlet and said return air duct for transferring thermal energy between the return air and the fresh, outside air;
• said heat exchanger comprising one or more heat conductive air filtration substrates integrated therein for conducting heat;
• a heat pump located between said air inlet and said elongated diffuser for changing a temperature level of the fresh, outside air or the return air passing through said heat pump.