Optimizing Heat Recovery from Split AC Systems for Water Heating: Performance Analysis of Helical Coil Configurations and Power Capacities

This study explores the efficient utilization of waste heat energy from the outdoor unit of a split air conditioning system to heat water using a helical coil configuration. We investigated various configurations within a 60-liter tank, focusing on split air conditioners with capacities of 1/2 PK, 1 PK, and 2 PK, and tested helical coils with diameters of 15 cm, 25 cm, and 30 cm, and turns of 5, 10, and 15. AData on compressor, condenser, and water temperatures were systematically collected to assess heating efficiency and duration. Our findings reveal that both air conditioner capacity and coil design significantly influence heating performance. ANotably, the 2 PK air conditioner paired with a 30 cm coil and 15 turns achieved a maximum water temperature of 57.72 degrees C within 105 minutes, compared to 49.52 degrees C in 120 minutes for the 1 PK unit, and 44.72 degrees C in 135 minutes for the 1/2 PK unit. This research underscores the potential for optimizing helical coil configurations to enhance heat transfer efficiency, offering an effective and energy- efficient alternative to conventional water heating methods while reducing operational costs.