Energy recovery in recirculation air systems and its calculation of dust concentration, relative humidity and heater capacity.

In some ventilation and dust removing system of workshop, a great deal of energy is wasted due to heated and cooled indoor air being exhausted directly. So if the dust in the indoor air is removed and then recirculate, the objective of energy saving can be reached. In this paper, the calculation equation of dust concentration, relative humidity in indoor and recirculate air and heater capacity are given along with the control measures to them. This kind of system has been practiced at a plant building located in beating region of northern China, the expectable result of energy saving was obtained, thus verified the conclusion in this paper.