"Reversible Flow Fan" that allows you to change the direction of the fan's airflow with just one unit

We want to meet the need for smaller systems, but we can't maintain a balance between intake and exhaust volume...

Company C, a manufacturer of housing equipment, was working on the new development of a heat exchange ventilation system. Mr. H of the Product Development Department of Company C had the following to say:
"The market is seeing an accelerating trend toward smaller, more cost-effective heat exchange ventilation systems, so we began developing this new system in response to this trend. Current systems are equipped with separate fans for intake and exhaust. The intake fan supplies clean, filtered air into the room, while the exhaust fan expels dirty indoor air outside. With the new heat exchange ventilation system, we were looking at reducing the number of fans to just one and making the system more compact by switching the fan's airflow direction."

Mr. H immediately consulted with the fan manufacturer and began evaluating samples.
"We tried switching the airflow direction with a single fan, but found that the difference in airflow between forward and reverse rotation was greater than we had expected. The heat exchange ventilation system maintains temperature using an internal heat storage element, so if the intake and exhaust volumes are different, the efficiency of maintaining temperature drops. For this reason, we needed to precisely control the rotation speed during forward and reverse rotation so as not to upset the balance between intake and exhaust, but we struggled to come up with a way to do this," said Mr. H.
Having reached a dead end in development, Mr. H decided to look for a solution to the problem.

Same air volume and static pressure in both forward and reverse directions! One fan can both intake and exhaust air

In order to solve the problem, Mr. H attended an industrial technology event, where he stopped by SANYO DENKI CO., LTD. 's booth and consulted with the person in charge.

After listening to Mr. H's concerns, the SANYO DENKI CO., LTD. representative proposed a "Reversible Flow Fan" with PWM control function. Mr. H was very attracted to this proposal.
"The proposed fan achieved almost the same air volume and static pressure in both forward and reverse rotation by optimizing the blade and frame shape. This makes it easier to control because there is no need to adjust the rotation speed separately for forward and reverse rotation." (Mr. H)

Successfully developed a new heat exchange ventilation system! Achieved size reduction and cost reduction

Mr. H immediately carried out in-house testing and confirmed that the balance of intake and exhaust volumes could be maintained. The results of the in-house evaluation were very positive, and Company C soon officially adopted the "Reversible Flow Fan" and successfully developed a new heat exchange ventilation system.
"By reducing the number of fans from two to one, we were able to successfully downsize the heat exchange ventilation system, which has pleased our customer. Also, during in-house testing, they suggested a PWM Controller box type, which we used in the prototype, which allowed us to smoothly complete the air volume evaluation. We were able to install the best fan this time. We hope to consult with SANYO DENKI CO., LTD. again in the future." (Mr. H)

release date: 2019-03-31 00:00