Automatic indoor Temperature Controlled Electric Fan

Abstract

In this study, we report the development of an automatic indoor temperature-controlled electric fan, enabling the automation of the regulation of the ambient temperature. The manual physical control of the indoor electric ceiling fans can be challenging and inconvenient, especially in facilities for the infants, the disabled, or handicapped people. It is also crucial for the indoor fans deployed in farm houses for livestock to be automated, such that the fan speed can be automatically regulated by the ambient temperature. That way, the operation of the indoor electric fans dependent on manual control will be eliminated making the device more effective and efficient without relying on human cognitive ability.   The developed prototype device utilizes an LM35 temperature sensor, an LM339 comparator, and a relay switch to actuate and automatically control the speed of the rotation of the ceiling fan, generating a cooling breeze that enhances the transfer of heat via convection. In this setup, the indoor electric fan rotation speed changes automatically through a five-speed range in ascending order levels. Another unique improvement of this device is in the design of the shape of the fan blades, width, length, and total number of three in a star arrangement that enhanced the velocity of the air distribution within its circulation field. The trial tests using the developed prototype automatic indoor temperature-controlled electric fan showed improved room ventilation up to 20% and a more efficient fan aerodynamics rotating with reduced noise and with a uniform air distribution pattern in the room.