It is thus unclear what efficiency gain can be expected from such systems. Baek et al. [21], for instance, report a coefficient of performance (COP) of 4.5 – 5.0 and 100 % hot water load coverage in a hotel, using a water-water heat pump and greywater as heat source. However, ...
However, a huge potential still exists to lower the hot water energy demand, especially by harnessing heat from waste water exiting these buildings. Reusing this heat makes buildings more energy-efficient and this source is considered as a third-generation renewable energy technology, both factors ...