Experimental study of the performance of heat recovery by a fin and tube heat exchange tank attached to the dishwasher greywater line

SELİMLİ S. , Karabas T., Taskin Y., Karatas M. B.

SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS, cilt.36, 2019 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 36
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1016/j.seta.2019.100552


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.