DEDICATED OUTDOOR AIR SYSTEM WITH PRE-HEATING AND METHOD FOR SAME

摘要

An energy exchange system is provided that may include a heater configured to be disposed within a supply air flow path. A first pre-heater is configured to be upstream from the heater within the supply air flow path and configured to pre-heat the supply air with a first liquid that circulates through the first pre-heater. A boiler may be operatively connected to the first pre-heater and configured to heat the first liquid. The system may also include a second pre-heater configured to be upstream from the heater within the supply air flow path. A heat transfer device may be operatively connected to the heater and the second pre-heater. The heat transfer device is configured to receive flue gas from the heater and transfer heat from the flue gas to a second liquid within the heat transfer device.