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Internet of things (IoT) makes every object have a representation in the virtual world that allows us to monitor and control them in the cyberspace. Monitoring of environmental conditions, rooms, and air conditioner controls can be used to find out and develop indoor room control strategies to be more efficient and comfortable for occupants. However, environmental conditions affect the dynamics of the system and its controller functions. This paper proposed a new approach to control room temperature through the control of the AC compressor duty cycle using IoT. Hybrid Fuzzy-PID (Proportional-Integral-Derivative) as a control algorithm that is embedded on the IoT platform. The algorithm determines optimal PID control parameters and adjusts them according to environmental conditions. Intelligent control proposed is applied to save energy and regulate the comfort of the room for residents. Finally, the Hybrid Fuzzy-PID and IoT approach allow us to achieve 50% energy savings in comfort that can be tolerated by occupants of the room.

This papers propose a physical model that includes the outdoor temperature to determine thermal characteristics of the room by using IoT technology. The physical model is used in the computation in the cloud. The thermal characteristics obtained is used to minimize the energy consumption in room cooling system. The temperature in the room can be also controlled by processing the thermal characteristics in real-time. This papers only show the compatibility of the model with the real experiments data. The physical model is obtained by using thermodynamics and transport phenomena concepts, which are heat capacity and thermal resistance. This model is tested by using 4 real room temperature data set and the thermal characteristics values obtained is analysed with plotting them to outdoor-indoor temperature difference. The physical model is compatible with the real temperature data. The thermal characteristics doesn’t vary much with the outdoor-indoor temperature difference. The thermal characteristics value when the compressor is on is higher.

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