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Energy, exergy and economic investigation of operating temperature impacts on district heating systems: Transition from high to low-temperature networks

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  • Topal, Halil İbrahim
  • Tol, Hakan İbrahim
  • Kopaç, Mehmet
  • Arabkoohsar, Ahmad

Abstract

District Heating (DH) systems, owing to their remarkable techno-economic benefits compared to decentral heat production methods, are getting more and more popular worldwide. Today, DH systems are much more efficient than in the past but investigations show that there is still much to explore for more benefits and higher efficiencies considering such systems, where lowering the operating temperature is one of the points with the highest potential advantages. This study evaluates the effects of using different levels of operation temperatures of DH systems. For making the assessments quantifiable, specific case study DH network with a CHP plant as the main tool of supply is considered for the analyses. Three different design scenarios for the system are considered for all of which the results of the energy, exergy, and economic analyses are presented for the subsystems and the whole heat grid. Through thermoeconomic analysis, the unit exergy costs of electricity and heat and unit exergy costs of Space Heating (SH) and Domestic Hot Water (DHW) are determined. The results showed that lowering the operating temperatures increased the overall energetic and exergetic efficiencies of the CHP-supplied DH system, while reduced the cost per exergy unit associated with the SH and DHW supply.

Suggested Citation

  • Topal, Halil İbrahim & Tol, Hakan İbrahim & Kopaç, Mehmet & Arabkoohsar, Ahmad, 2022. "Energy, exergy and economic investigation of operating temperature impacts on district heating systems: Transition from high to low-temperature networks," Energy, Elsevier, vol. 251(C).
    • Handle: RePEc:eee:energy:v:251:y:2022:i:c:s0360544222007484
    DOI: 10.1016/j.energy.2022.123845
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    Cited by:

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    2. Capone, Martina & Guelpa, Elisa & Verda, Vittorio, 2023. "Potential for supply temperature reduction of existing district heating substations," Energy, Elsevier, vol. 285(C).
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    4. Güngör, Osman & Tozlu, Alperen & Arslantürk, Cihat & Özahi, Emrah, 2024. "District heating based on exhaust gas produced from end-of-life tires in Erzincan: Thermoeconomic analysis and optimization," Energy, Elsevier, vol. 294(C).

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