Heat losses through pipe connections in hot water stores

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Abstract

The heat loss from pipe connections at the top of hot water storage tanks with and without a heat trap is investigated theoretically and compared to similar experimental investigations. Computational Fluid Dynamics (CFD) is used for the theoretical analysis. The investigations show that the heat loss from an ideally insulated pipe connected to the top of a hot water tank is mainly due to a natural convection flow in the pipe, that the heat loss coefficient of pipes connected to the top of a hot water tank is high, and that a heat trap can reduce the heat loss coefficient significantly. Further, calculations show that the yearly thermal performance of solar domestic hot water systems is strongly reduced if the hot water tank has a thermal bridge located at the top of the tank.
Original languageEnglish
Title of host publicationProceedings of ISES 2007 : Solar Energy and Human Settlement
VolumeVolume IV
Place of PublicationBeijing, China
PublisherSpringer
Publication date2007
Pages1998-2002
ISBN (Print)978-7-302-16146-2
Publication statusPublished - 2007
EventISES Solar World Congress 2007 - Beijing, China
Duration: 18 Sep 200721 Sep 2007
https://www.ises.org/ISES.nsf/5c990687ba31ff01c12568b3004ef917/199bb81ccb4fa044c1257448002e2f2b?OpenDocument

Conference

ConferenceISES Solar World Congress 2007
CountryChina
CityBeijing
Period18/09/200721/09/2007
Internet address

Keywords

  • Hot water stores, pipe connection, thermal bridge, heat loss, heat trap, measurements, CFD-calculations

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