Abstract
Characteristics of different heat recovery devices from exhaust air were introduced.An actual project was taken as an example,three heat recovery systems from exhaust air by rotary wheel exchanger,plate- fin heat exchanger and recovery fresh air heat pump units were presented.The energy saving and economic of these heat recovery systems were analyzed.Initial investment and payback period of the system was reckoned.Considering the above situation,the recovery fresh air heat pump unit has a considerable energy saving potential.
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