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Title:
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Energy performance of a drainwater heat recovery system; experimental results of drainwater heat recovery in ECN research dwellings
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Author(s):
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Published by:
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Publication date:
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ECN
Energy in the Built Environment
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1-11-2005
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ECN report number:
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Document type:
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ECN-RX--05-178
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Conference Paper
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Number of pages:
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Full text:
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7
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Download PDF
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Presented at: CISBAT, Lausanne, Switzerland, 28 september 2005.
Abstract:
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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