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Title:
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Opslag van thermische energie in een flexibele waterzak
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Author(s):
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Published by:
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Publication date:
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ECN
Energy Efficiency in Industry
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1-3-1999
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ECN report number:
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Document type:
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ECN-C--99-024
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ECN publication
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Number of pages:
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Full text:
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127
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Download PDF
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Abstract:
A cheap and flexible way to store heat from several heating installationsis using a water bag. The prime advantage of a water bag over a conventional
water tank is the ease of handling; it can be placed in less accessible
spaces, e.g. cellars. A heat exchanger, however, is necessary for pressure
separation, because a water bag can not withstand the system pressure. A test
system has been built consisting of a 100 kW heat generator and a 7 m3
insulated water bag. In order to obtain experience with this type of storage,
test runs of a week with a simulated heat demand were performed for several
applications. (e.g. heat pump, cogeneration unit, solar collector). The
results show that it is possible to obtain some stratification in the water
bag and to improve the utilisation of the heating installations. The power
performance, however, is a function of the changing temperature during
(un)loading. In order to increase the energy density of the storage unit and
to improve the power performance with a constant temperature at (un)loading,
the application of phase change materials is recommended. 22 refs.
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