Experimental and numerical analysis of shower drain water heat recovery heat exchangers fouling

Heat recovery from grey water is an interesting strategy that can drastically reduce energy consumption for DHW. However, these exchangers contain warm water on the hot side that is contaminated (grease, organic matter) and in contact with oxygen, which encourages the development of biofilm. This biofilm has a potentially significant impact on the performance of these exchangers. The aim of this study is to analyse one year’s experimental data and to derive an analytical data driven model simulating biofilm development and contact resistance for use in calculation codes.

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