Towards low energy, low tech and low cost DHW production for buidlings

The energy used for DHW is becoming an increasingly important part of a building’s energy balance as a result of thermal renovation and stringent regulations for new buildings. Solar thermal systems are still underdeveloped and sometimes complicated to install, particularly in existing buildings. Most production is carried out in France using electric storage tanks and, to a lesser extent, thermodynamic storage tanks. It is also possible to recover the waste heat contained in grey water from showers. This can drastically reduce DHW consumption. The aim of this study is to make an energy comparison between different DHW production strategies that include a grey water heat recovery strategy: electric tank + heat recovery unit, thermodynamic tank + heat recovery unit and thermodynamic production using grey water as the cold source. This study will also take into account the development of biofilm in these exchangers, as well as dynamic effects.

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