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    Experimental study of the performance of heat recovery by a fin and tube heat exchange tank attached to the dishwasher greywater line
    (Elsevier, 2019) Selimli, Selcuk; Karabas, Talha; Taskin, Yunus; Karatas, Mehmet Burak
    In this study, it was experimentally investigated to recover the wastewater (greywater) heat of a household dishwasher to the freshwater taken from the tap during the washing process. In this context, a heat exchange tank is connected between the drain line of the dishwasher and the tap water line. The washing process was observed for two different conditions. First, the dishwasher washing process experiments were carried out for eco, fast and intense programs without connection to the heat exchange tank. Then, the experiments were repeated by connecting the heat exchange tank. As a result, the amount of savings is estimated at about 57.1 kWh and its economic value is about $ 7.77 per year. The cost of the heat exchange tank and reinforcement is $ 52, and the payback period is estimated to be approximately 6.7 years. With the recovery of energy, 21.08 kg less CO2 emissions will be achieved annually.
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    Greywater heat recovery to the refill water of a dishwasher via paraffin wax and steel wool aided segmental baffle heat exchanger
    (Taylor & Francis Inc, 2024) Taskin, Yunus; Selimli, Selcuk
    In this study, the recovery of household dishwasher greywater thermal energy into dishwashing water using paraffin wax and steel wool supported segmental heat exchanger was experimentally investigated. The heat exchange performance was 40% in rapid, economy, and intensive modes and the heat recovery was 0.048, 0.031 and 0.082 kWh, respectively. Efficiency increased by 5.01%, 3.84%, and 6.5%. Time and energy were saved, and hygienic washing was accomplished by raising the washing temperature and reducing the cycle time nearly 97, 113, and 240 s. It is estimated that by using heat exchangers on 16,954,196 dishwashers in use in Turkey, small, medium, and large families can save an average of 127.366, 254.733 and 509.466 GWh per year, respectively, provided they use the three dishwasher modes equally. The annual economic size of the gain and its contribution to emission reduction in CO2 equivalents are $15.793 million, $31.586 million, $63.173 million and 112.974 kt, 225.948 kt, 451.897 kt, respectively. Energy efficiency index of dishwasher increased from 48.84 to 46.97.