LAUSR

Abstract In this paper, the performance improvement of a split air conditioning system has been experimentally investigated to be efficiently utilized in the hot and dry weathers. To examine these improvements, a hybrid proportional integral differential controller was designed and implemented. This controller depends upon dual Proportional Integral Deferential successive algorithms, starting with air conditioning fan variable speed algorithm and followed by water mist variable flow rate algorithm according to the ambient temperature. These algorithms were integrated with a PIC16F877A microcontroller. Both of the air and water flow rates were controlled via a pulse width modulation technique. The proposed controller provides an additional operating stability for the air conditioning system during the instantaneous variation of weather conditions. The results show that the integration of the proposed control system with the modified air conditioning system leads to increase the energy saving and improve the coefficient of performance over a wide range of ambient temperatures (35–57) °C. It was found that the coefficient of performance for the improved system was increased by around 17.14% and 109.1% at ambient temperature 40 °C and 57 °C, respectively, and the energy saving was increased by about 20.67% and 46.63% at ambient temperatures 45 °C and 57 °C, respectively, compared to the conventional air conditioning system.