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ECN publication
Energy performance of a drainwater heat recovery system; experimental results of drainwater heat recovery in ECN research dwellings
Published by: Publication date:
ECN Energy in the Built Environment 1-11-2005
ECN report number: Document type:
ECN-RX--05-178 Conference Paper
Number of pages: Full text:
7 Download PDF  

Presented at: CISBAT, Lausanne, Switzerland, 28 september 2005.


The unit ?RenewableEnergy in the Built Environment? (DEGO) of the Energy research Centre of the Netherlands (ECN) has four research dwellings at its disposal to do integral energy research in buildings. Three of the research dwellings are equipped with a drainwater heat recovery (DHR) system in the drainwater pipe of the shower. The DHR system pre-heats the fresh (cold) supply water of the dwelling with the heat of the warm drainwater of the shower. Measurements show a heat exchange efficiency of 51% to 63%, depending on the installation and use of the pre-heated supply water. Furthermore is estimated that up to 3GJ primary energy can be saved annually using the DHR system. It should be mentioned that the annual saved energy strongly dependents on the installation of the DHR in relation to the domestic hot water system. This makes it difficult to predict the energy performance of the DHR.

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