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 o C, 23 o C and 27 o 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 o C-64.33 o 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.

The Air Source Air Conditioning Water Heater (ASACWH) performance as an energy source to heat water in the tank using dummy condenser type of trombone coil with different diameter and pipe length without hot water circulation has been investigated. The diameter and length of the dummy condenser pipe are intensely affected by ACWH performance. In this study, cooling capacity, Coefficient of Performance (COP), compressor power and room temperature were evaluated in three types of trombone coil (6.4 mm coil diameter with a length of 7.9 m, 6.4 mm coil diameter with a length of 5.3 m, and 9.5 mm coil diameter with a length of 5.3 m) with different cooling load variation. This study used cooling load with a variation of 0 W, 1000 W, 2000 W, and 3000 W without hot water circulation in the simulation room. It was found that the ASACWH using a pipe with a coil diameter of 6.4 mm and length of 7.9 m performed the highest cooling capacity and COP, and produced more comfortable room temperature than the other two pipes. The results indicated that when the cooling load icreased from 0 W to 3000 W, the compressor power increased by 11.3%, 6.3%, and 9.3%, using the 6.4 mm coil diameter with 7.9 m length, 6.4mm diameter of the coil with 5.3m length and 9.5mm coil diameter with 5.3m length, respectively.

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