| 摘要 |
PURPOSE:To make it possible to prevent dusts from accumulating in a heat- exchange element by rotating passage changeover dampers to replace an exhaust ventilating flue with a supply air ventilation flue within a heat exchanging element. CONSTITUTION:Even when dusts are attached to the end surface of the heat- exchange element 8, passage changeover dampers 13 and 16 rotate to form outlet ports, thus dirts and dusts being swept off. Further, since the direction of air flow is reversed on a heat transfer plate by rotating passage changeover dampers 13 and 16, lowering of quantity of air flow and heat exchange ratio caused by the clogging of the end surface of the heat-exchange element 8 and the heat transfer plate can be prevented. |
