Purified waste water converted into district cooling
(Thomson Reuters ONE) -
Since the mid 1980s, Örebro-based E.ON (formerly Örebro Energi/Sydkraft) has
employed a policy of re-using purified waste water. Waste water is pumped from a
pumping station in Skebäck up to two heating pumps at the Åbyverket CHP plant,
where heat is recovered from the cleaned waste water. Once that process is
complete, the now cooled waste water is pumped back via Skebäck and released
into Svartån River, which flows into Lake Hjälmaren.
In 1998, E.ON also began supplying district cooling to Örebro University
Hospital, Örebro County Council and international paper and packaging company
Mondi. As by definition the waste water is not clean, it has to be purified.
This meant that E.ON had to invest significant time and resources on site to
clean customers' heat exchangers. This was viewed as an unnecessary cost by both
customers and the supplier.
When, in 2009, E.ON was awarded the contract to supply district cooling to
central Örebro, the decision was taken to build a dedicated heat exchange
station adjacent to the pumping station in Skebäck. Waste water is now exchanged
via a clean water system that is then distributed to the Åbyverket plant and
sent on to district cooling customers. Tranter has supplied two GXD-205 gasketed
plate heat exchangers to exchange between purified waste water and district
cooling water. Total output is 18 MW (9MW per heat exchanger). Tranter's plate
heat exchangers are ideal for applications with close temperature approach. For
this particular application, the heat exchangers were designed with 1 bar
pressure drop. The relative high pressure drop maintains channel velocity and
shear stress at high level, thus reducing maintenance requirements (important
for the waste water).
The energy and power company E.ON, which also provides district cooling in
Malmö, Norrköping and Kungsbacka, has supplied district cooling services to
Örebro University Hospital for the past 12 years, and market demand for this
service is generally increasing. District cooling is of particular interest when
erecting new buildings or renovating office and business premises.
District cooling affords a number of benefits. For example, district cooling
offers a more efficient use of electricity compared to conventional
refrigeration locally at multiple sites. In addition to the investment costs
associated with conventional refrigeration, district cooling provides, in
financial terms, a stable and long-term pricing structure. But perhaps the most
important aspect is the benefit to the environment. Unchecked emissions of
refrigerants from multiple small chillers contribute towards the degradation of
the ozone layer. In terms of the indoor environment in properties, district
cooling is quiet and takes up very little space.
[HUG#1465180]
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Source: Tranter International AB via Thomson Reuters ONE
Unternehmensinformation / Kurzprofil:
Datum: 25.11.2010 - 09:02 Uhr
Sprache: Deutsch
News-ID 49106
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contact information:
Town:
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Kategorie:
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"Purified waste water converted into district cooling"
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