Experimental study of split air conditioner with and without trombone coil condenser as air conditioning water heater

This paper reports an experimental investigation of the performance split air conditioner (AC) with and without combined coil (trombone coil condenser) as heat pump water heater. The coil is a heat exchanger that is placed between the compressor and the condenser (main condenser) by utilizing the heat rejection. The coil is placed in an insulated water storage tank with a capacity of 50L. Data are captured every 5 minutes during the 120 minutes of testing, where the room temperature is maintained at temperatures of 20 degrees C, 23 degrees C and 27 degrees C with variation of the cooling load at 1000W, 2000W and 3000W respectively. The results indicated that the use of coil increases the performance of air conditioner as an cooling air in room and water heater in reclamation tank simultaneously. The use of coil causes a slight increase in compressor power 0.014 kW (2%), where the COP increases around 12% higher than the increase in compressor power percentage, which is used as a water heater. Condenser temperature and room temperature with coil slightly rise compared to without coil at the cooling load increase. The finding indicates that the addition of the coil generates free hot water with temperature range around 61.54 degrees C- 64.33 degrees C. The application of AC combined with water heater using coil does not affect the cooling performance but it can improve the energy performance considerably for cooling and energy saving for heating water.