As the form of the aforementioned systems using for small
single family was relatively simple, and the temperature of SDW
leaving the shower bath was still high, it could not make full use
of the energy in SDW. To improve utilization efficiency of the waste
heat in SDW, a novel heat pump water heater for shower (HPSWH)
assisted with SDW was proposed in this paper. The novel heat
pump water heater could recover part of waste heat from SDW
with the water pre-heated loops before recovering most of the
waste heat by heat pump cycle. In addition, a large portion of electricity
could be saved compared to traditional electrical heater.
And compared with large systems (city waste water), it has the
advantages that the system is easier for installation and heat loss
for delivering the water in large systems could be avoided.