Air Sourced Heat pump Hot Water Heaters (ASHPWH) are integrated in buildings as a multitask system to act as both a water heater and air cooler with a lower carbon footprint. The cost effectiveness of the ASHPWH systems relative to the conventional water-heaters is a challenging issue which is researched in this project. A refined heat pump was integrated into a water heater tank and tested using the Australian testing standard AS/NZS 5125. Experiments included measurement of flow rate, temperature and pressure of water, air and refrigerant (R410a) to determine Coefficient of Performance (COP) and cost-effectiveness of the ASHPWH relative to the current 310L-ASHPWH and a standard electric water heater of similar size. The leaving water location of the condenser was also studied to reduce scalding / to destroy Legionella bacteria, to improve mixing and the delivery of hot water to the storage-tank, to enhance heat transfer stratification, buoyancy, or pumping. The relative position of the water from the storage-tank was varied and coefficient of performance (COP) of the Heat-pump and effectiveness of the water heater were determined. Experiments included measuring water, air and refrigerants flow-rates and temperatures and power consumed in compressor. This research in progress will recommend on the conditions this method is reasonable. The operational cost of 310L was 38% cheaper than the standard electric. The design (claimed) heat pump would operate 52% cheaper than the electric water heater. Carbon tax was not included but it is estimated that carbon footprint of the tested heat pump and the Standard 310L - ASHPWH were lower due to lower consumption of 40% and 33% electricity respectively relative to the electric water heater.
- Heat Transfer Division
Experimental Investigation on Influence of Integrated Heat Pump in Performance of Domestic Water Heaters
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Ison, J, Madadnia, J, & Vakiloroaya, V. "Experimental Investigation on Influence of Integrated Heat Pump in Performance of Domestic Water Heaters." Proceedings of the ASME 2012 Heat Transfer Summer Conference collocated with the ASME 2012 Fluids Engineering Division Summer Meeting and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. Volume 1: Heat Transfer in Energy Systems; Theory and Fundamental Research; Aerospace Heat Transfer; Gas Turbine Heat Transfer; Transport Phenomena in Materials Processing and Manufacturing; Heat and Mass Transfer in Biotechnology; Environmental Heat Transfer; Visualization of Heat Transfer; Education and Future Directions in Heat Transfer. Rio Grande, Puerto Rico, USA. July 8–12, 2012. pp. 151-155. ASME. https://doi.org/10.1115/HT2012-58197
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