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					E.ON Värme




             With warmth
                                         from the Aktern Heat Pump plant

             The Aktern Heat Pump plant forms the core of an energy
             system that provides the inhabitants of the Bo01 area in Västra
             Hamnen in Malmö with 100% locally renewable energy. Most of
             the area’s heating requirements are supplied by the Aktern Heat
             Pump facility, which utilizes natural underground reservoirs,
             or aquifers. The water in the aquifers is used to seasonally store
             the warmth of summer and the cold of winter. This minimizes
             the need for external energy supply to the area. The balance of
             the heat production is supplied via solar panels installed on a
             number of buildings in the area.
                 A nearby windpower plant and photovoltaics produce the
             electricity needed to power the heat pump and to meet the other
             electricity requirements of the area.
The Aktern Heat Pump plant

The main energy source for the production of              When the seawater is sufficiently cold, it acts as a
heat in Västra Hamnen in Malmö is a heat pump,            resource for the extraction of natural cooling.
combined with an aquifer.                                      The district cooling is mainly used by premises
     An aquifer is a natural reservoir in the bedrock,    outside the Bo01 area in Västra Hamnen and only
which can be used for the storage of energy, both         a few residential buildings inside the area are
heat and cold, rather like a thermos container.           connected to the system. Two chillers are installed to
In Västra Hamnen, there is one row of “cold” wells        meet these requirements.
and one of “warm” wells. Via a system of pumps                 The heat pump operates on electricity that is
and pipelines, the heat from the summer and the           produced via a local windpower plant and, to some
cold from the winter are stored in the aquifer on a       extent, photovoltaics. Surplus renewable energy
seasonal basis. The heat and cold are then used as        is lent by the system to the city’s existing network
needed and the temperature is adapted to meet             and in the event of a deficit, the city repays the
specific requirements with the help of a heat pump.       system with the energy it needs.
     The heat pump collects heat either from the               The aim is for all of the energy supplied in the
district cooling return pipe, or from the aquifer. The    area to be 100% locally renewable on an annual
cooling resulting from the heat extraction process        basis. However, several buildings consume signifi-
can either be delivered directly to the local district-   cantly more energy than the established targets,
cooling network or stored in the cold wells of the        which means that the locally produced energy is
aquifer. When the aquifer system is operated to           not always sufficient to supply the area. Despite
deliver district cooling, the returning heat is stored    this the environmental gains of the system are
in the hot wells in order to be upgraded to district      considerable.
heating by the heat pump in the winter season.
   The Aktern Heat Pump plant consists of:                              The system includes four water circuits:
   • The heat pump, which produces heat and cooling.                    • Surface water circuit, which takes in seawater
   • Chillers, which produces cooling.                                    through heat exchangers and subsequently
   • Heat exchangers.                                                     pumps it back out into the sea. Used to cool the
   • Seasonally based storage for heat and cooling in                     warm side of the refrigerating machines during
     underground aquifer at a depth of 40–70 meters.                      April – October and for natural cooling production
   • Ten drilled wells (90 meters deep), with related                     during November – March.
     pumps.                                                             • Ground water circuit relates to the water pumped
   • 1,400 square meters of solar panels installed on                     up and down through the wells in the aquifers.
     ten different buildings, connected directly to the                   Used throughout the year, when the cold and hot
     district heating network.                                            water stored in the respective wells is used as a
   • 120 square meters of semitransparent photo-                          source of energy.
     voltaics installed on a building and directly                      • District heating circuit, which distributes district
     connected to the electricity network.                                heating to connected properties in the area.
                                                                        • District cooling circuit, which distributes cooling
                                                                          to connected customers in the area.
Approx. 90 meters




                                       Approx. 200 meters




   Facts about Aktern Heat Pump plant

   Type of facility                         Primary plant                            Capacity – cooling
   Heat pump plant, utilizing an aquifer    Heat pump (1.1/0.7 MW), chillers         0.7 MW from heat pump, 1 MW from
   in combination with solar panels on      (2.4 + 3.0 MW), four heat exchangers.    aquifer, 0.8 MW from seawater, 5.4 MW
   ten buildings, photovoltaics and wind    Ten drilled wells, in an aquifer at a    from refrigerating machines.
   power. The facility is part of a “100%   depth of 40–70 meters. Four separate     Capacity – electricity
   locally renewable” energy system.        circuits for surface water, ground       2 MW windpower plant, generates
   Year of construction                     water and for distribution of district   about 6,300 MWh per year and
   2001.                                    heating and cooling.                     120 photovoltaics generate about
   Location                                 Other units                              6,000 kWh per year.
   Västra Hamnen, Malmö,                    Adjacent windpower plant (2 MW)          Annual production
   southern Sweden.                         for production of electricity needed     5,800 MWh of heat.
                                            within the area. Some 1,400 square       5,000 MWh of cooling.
   Customers
                                            meters of solar panels, of which         6,300 MWh of electricity.
   Private householders and companies
                                            200 square meters are of vacuum
   in Västra Hamnen.                                                                 Storage capacity
                                            solar panel type, and the balance
   Technology                                                                        2,500 MWh.
                                            comprises normal flat-panel
   Heat pump plant for production of        collectors. 120 square meters            Auxiliary energy
   district heating and cooling.            photovoltaics.                           Area connected to Malmö’s district
   Type of energy                                                                    heating network, which provides a
                                            Capacity – heat
   The principal energy source is                                                    buffer function.
                                            1.1 MW (heat pump).
   the stored energy in the aquifer,        1,400 square meters of solar panels      Environment
   supplemented by wind power.              generate about 300,000 kWh per year.     The system entails major environmental
                                                                                     gains and the area is essentially self-
                                                                                     sufficient in heat and electricity.
                             Did you know that…
                             … 1 kWh of electricity supplied from the windpower plant to the heat pump
                                compressor generates 3 kWh of heat and at the same time 2 kWh of cooling.
                             … the aquifer in Västra Hamnen contains fossil seawater.
                             … seasonally based storage of heat and cooling is a solution that could be of major
                                importance in the future. Natural resources can be utilized with only a minimal
                                effect on the environment. Seasonally based storage means that heat and
                                cooling can be stored until needed.
                             … during 2009, E.ON invested SEK 3 million in optimizing the heat pump and
                                SEK 1.5 million in renovating the solar panels.

                             District heating
                             In densely populated urban areas, district heating is essential for providing a
                             sustainable and competitive heating service that also has the least possible impact
                             on the environment. Before the introduction of district heating, property owners
                             used individual boilers to heat their premises. District heating has enabled several
                             hundred chimneys to be replaced by one or just a few. And, to a large extent, it
                             has also enabled coal and oil to be replaced by such energy sources as waste
                             heat, biofuels and gas. In two decades, district heating has led to a reduction in
                             CO2 emissions from heating of around 11 million tons, which is equal to 20% of the
                             current emissions from the whole of Swedish society.

                             Development of district heating in Malmö
                             Malmö is one of more than 570 communities in Sweden that have invested in the
                             expansion of district heating. Construction of Malmö’s district heating system
                             started in 1951 and approximately 90% of all properties in Malmö currently use
                             district heating. The network in Malmö is connected to the district-heating network
                             in the Municipality of Burlöv, where district heating also accounts for a consid-
                             erable share of heat services. In addition to proprietary facilities, E.ON has agree-
                             ments to capitalize on the surplus heat generated by the Sysav South Scania Waste
                             Company’s waste combustion.
                                  The district-heating network in Malmö/Burlöv comprises 560 kilometers of
                             dual piping, which combines to form a total distance of 1,120 kilometers. The same
                             distance as from Malmö to Paris!




For further information, please contact
E.ON Värme, +46 (0)40-25 50 00 or
                                                                                                                     2010.04




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posted:8/25/2011
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