Method for Redesign of District Heating Networks within Transition from the 2^nd to the 3^rd Generation

Abstract:

Important investmentsare made lately in the area of district heating, as a technology capable ofhelping countries to reach sustainability goals. In Romania, European fundswere spent for transition from the 2^nd to the 3^rdgeneration of district heating systems. The lack of appropriate monitoringsystems in old district heating systems makes optimisation nowadays very difficult,especially because nominal values used in the first design stage areoverestimated. Realistic nominal heat loads are necessary to make goodestimations of hydraulic parameters to be used for redesign. This studyproposes a method that uses the heat load duration curve theory to identify theappropriate nominal heat loads to be used for redesign. Comparison betweenresults obtained by applying the nominal heat loads of each consumer, as theywere established in the first design stage, and the ones identified by theproposed method are analyzed in a case study. The results show that errors arein the +/- 3% band, between the metered heat consumption rates and the proposedrates. The new method can be used for the sizing of pumps and district heatingnetworks after retrofit, in order to get better adjustments of the circulationpumps and increase of the energy efficiency.

• Periodical: Applied Mechanics and Materials (Volume 657)
• Pages: 689-693
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.657.689
• Online since: October 2014
• Authors: Răzvan Corneliu Lefter*, Daniela Popescu, Alexandrina Untăroiu
• Keywords: District Heating Networks, Heat Load, Hydraulic Analysis, Pumping Energy

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DOI: 10.1016/j.jclepro.2008.08.017