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System analysis in a European perspective of new industrial cooling supply in a CHP system

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  • Svensson, Inger-Lise
  • Moshfegh, Bahram

Abstract

In the municipality of Södertälje two large industries use much of the electricity, district heating (DH) and chilled water in the area. The Södertälje energy system is not isolated, however, but is connected to the DH systems of southern and central Stockholm, and a change in the Södertälje energy system will also influence the connected energy systems in Stockholm. The cooling demand in Södertälje is currently covered by lake water cooling and compression chillers, but in order to reduce the use of electricity, conversion to absorption cooling or increased lake water cooling can be considered. The large combined heat and power (CHP) plant in Södertälje is not used to its full potential today, but investment in absorption cooling and/or a cold condenser unit integrated with the CHP plant could increase the plant’s operation hours. In this paper the system effects of introducing new industrial cooling supply in Södertälje has been investigated through optimizations of a model including both the industries and the district heating supply in Södertälje and Stockholm. The results show that, independently of whether condensing power production is feasible in the CHP plant or not, investments in both increased lake water cooling and absorption cooling are profitable. A sensitivity analysis of how energy market prices affect the results shows that even though the system cost will change depending on energy market prices, the optimum cooling technology mix will remain the same. However, a sensitivity analysis of the transfer DH capacity between the Södertälje and Stockholm energy systems shows that if the transfer DH capacity is increased, absorption cooling will be less profitable since more heat can be sold from Södertälje to Stockholm while at the same time reducing the use of fuel resources.

Suggested Citation

  • Svensson, Inger-Lise & Moshfegh, Bahram, 2011. "System analysis in a European perspective of new industrial cooling supply in a CHP system," Applied Energy, Elsevier, vol. 88(12), pages 5164-5172.
    • Handle: RePEc:eee:appene:v:88:y:2011:i:12:p:5164-5172
    DOI: 10.1016/j.apenergy.2011.07.026
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    References listed on IDEAS

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    3. Olsson, Linda & Wetterlund, Elisabeth & Söderström, Mats, 2015. "Assessing the climate impact of district heating systems with combined heat and power production and industrial excess heat," Resources, Conservation & Recycling, Elsevier, vol. 96(C), pages 31-39.

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