Polygeneration in Vxj Beneficial for all Customer, Environment and Energy Company

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Polygeneration in VäxjöBeneficial for all
Customer, Environment and Energy Company

• Presentation at Local Renewables
• In Freiburg June 14th 2007

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Where is Växjö?

• Växjö is centrally located in the southern part
  of Sweden

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Why VEAB starts RES cooling?

• Increased demand of cooling in new buildings
• Increased competition from heat pumps
• Possibility to start electricity production in
  summer
• High price on electricity gives low margin cost
  on heat
• Distribution network already existing

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Cooling Växjö EU-project Concerto

• Step 1 - Absorbtion cooling at VEAB
• Step 2 Absorbtion cooling to the University and
  the Central Hospital in Växjö
• Step 3 - Absorbtion cooling without grants

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First step at VEAB

• Absorbtion machine at CHP
• Cooling capacity 300 kW
• Cooling duct to office
• Free cooling in winter 75 kW
• Absorbtion cooling in summer

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Vidéum (Växjö University)

• Existing network for cooling
• Cooling capacity 2 000 kW.
• Cooling by cooling towers
• Start of operation May 2009
• Grants from Concerto
• and Swedish Government

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Cooling at Växjö Central Hospital optional

• Absorbtion cooling 3000 kW
• Cooling from Lake Växjösjön
• Environmental permits required (2 years)
• Start of operation hopefully in May 2009

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Temperature increase in Lake Växjösjön summer
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Temperature increase winter
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Future market
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Cooling production Existing system

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Cost for cooling in existing system
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One mounth shutdown period
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How electric certificates influence on the cost
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Influence from new CHP
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Absorption share in cooling

• Present situation 40
• Shutdown period reduced 75
• With another CHP 90

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Lay-out main market
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Energy profile main market
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Energy production in Växjö
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Energy production at Sandviksverket in Växjö
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Växjö Energi AB
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07-01-16
Fuel mix at the Sandvik plant
GWh
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CO2 emissions from oil combustion
060322
Emissions in tonnes
CO2 (carbon dioxide)
201 000
199 000
196 000
183 000
6 300
13 000
8 000
3 700
Actual emissions from oil combustion
Theoretical emissions from the combustion of oil
alone and equivalent energy production
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