Development of Auto Thermal Control Device For Space Air - Conditioning
Akinde Olusola Kunle *
Department of Electrical and Electronic Engineering, First Technical University, Ibadan, Nigeria.
Maduako Kingsley Obinna
Department of Electrical and Electronic Engineering, Federal University of Technology, Owerri, Nigeria.
Akande, Kunle Akinyinka
Department of Electrical and Electronic Engineering, Federal University of Technology, Owerri, Nigeria.
Adeaga Oyetunde Adeoye
Department of Mechanical and Agricultural Engineering, First Technical University, Ibadan, Nigeria.
*Author to whom correspondence should be addressed.
Abstract
Auto Thermal Control device is an electronic based device which employs the application of temperature sensors to controlling household appliances without human interference directly. In this work, thermal source is used to regulate electrical fan and room heater depending on ambient temperature. The room heater, which is adjusted to a set temperature, switches ‘ON’ when the temperature of a room is low (cold). While the same is switches ‘OFF’ with increase in the room temperature. This triggers ‘ON’ an electric fan at different speeds, and thus cools the room. A temperature sensor, tthermistor, monitors change in room temperature. Two types of thermistor exists: Positive Temperature Coefficient, PTC. An increasee in the resistance of PTC results in increasee in temperature). In the Negative Temperature Coefficient, NTC; a decreasee in resistance yields to temperature increase. This article explored a NTC thermistor. The design could be a ready product in the market of the developing nation where environmental automation is yet fully deployed.
Keywords: NTC thermistor, wheatstone bridge, voltage comparator, switching circuit