Bottlenecks in district heating systems and how to address them

Brange, Lisa; Englund, Jessica; Sernhed, Kerstin; Thern, Marcus; Lauenburg, Patrick

doi:10.1016/j.egypro.2017.05.072

Cited by 20 publications

(15 citation statements)

References 42 publications

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“…The heat supply problems are related to an excessively high flow of heat transfer media in the DH network relative to the pipe diameter. This results in problems with maintaining the sufficient differential pressure in the system [65,66]. Generally, this phenomenon occurs with too small diameter pipelines when more consumers are connected to the DH network.…”

Section: Heat Supply Problemsmentioning

confidence: 99%

Smart Asset Management for District Heating Systems in the Baltic Sea Region

et al. 2021

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The purpose of this review is to provide insight and a comparison of the current status of district heating (DH) systems for selected Baltic Sea countries (Denmark, Germany, Finland, Latvia, Lithuania, Poland, and Sweden), especially from viewpoints of application and solutions of novel smart asset management (SAM) approaches. Furthermore, this paper considers European projects ongoing from 2016, involving participants from the Baltic Sea Region, concerning various aspects of DH systems. The review presents the energy sources with particular attention to renewable energy sources (RES), district heating generations, and the exploitation problems of DH systems. The essential point is a comparison of traditional maintenance systems versus SAM solutions for optimal design, operating conditions, and controlling of the DH networks. The main conclusions regarding DH systems in Baltic Sea countries are commitment towards a transition to 4th generation DH, raising the quality and efficiency of heat supply systems, and simultaneously minimizing the costs. The overall trends show that applied technologies aim to increase the share of renewable energy sources and reduce greenhouse gas emissions. Furthermore, examples presented in this review underline the importance of the implementation of a smart asset management concept to modern DH systems.

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Section: Heat Supply Problemsmentioning

confidence: 99%

Smart Asset Management for District Heating Systems in the Baltic Sea Region

et al. 2021

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“…Decreasing the supply temperature of the DH network to 30 ~ 70 ℃ will lead to smaller supply and return temperature difference. Higher flow rates within the current pipelines will largely increase the pressure losses, which challenges the distribution capacity of the current network, since the current network is designed for large temperature difference [14].…”

Section: Dilemma On Integrating Low-grade Renewables Into Current Dh mentioning

confidence: 99%

Integration of geothermal water into secondary network by absorption-heat-pump-assisted district heating substations

Song

Wang

You

et al. 2019

Energy and Buildings

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Integrating renewable energy into District Heating (DH) systems can significantly save the consumption of fossil energy and receive environmental benefits. The 4th Generation District Heating (4GDH) is the most promising technique for future DH systems by decreased supply temperature and use of low-temperature renewable thermal sources. As current district heating networks are mostly designed with supply temperature around 100℃, high hydraulic resistance and large pressure loss may often occur if decreasing the supply temperature to 30-70℃. This paper has proposed a Composite District Heating Substation (CDHS) with integrated geothermal water into the secondary network by Absorption Heat Pump (AHP). This has been demonstrated to be a feasible and effective solution for using low-temperature geothermal water in DH systems, without decreasing supply temperature of the primary network. The AHP is driven by hot water from the primary network, and the heat of the geothermal water could be used more intense by reducing its return temperature by the AHP and the plate 1 These authors contributed equally to this work. 2 heat exchanger. In this study, both the AHP and the whole substation were simulated by MATLAB, and the results indicated that the heating capacity of AHP increased when increasing the temperature or the mass flow rate of geothermal water, the mass flow rate of the primary network, or when decreasing the return temperature of the secondary network. Additionally, it was found that using temperature regulation with flow changing in stages in the secondary network could receive a higher COP of the AHP and a higher ratio of geothermal energy used in the substation. A case study was carried out as well and its results showed that comparing to conventional DH substations, the CDHS could save 8.0% of the annual cost and reduce 25.6% of the pollutant emissions for a heating season.

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“…(5) and Eq. (7). In this case, the substation's control decisions were locally determined by the weather conditions, the building and tank characteristics, and by user behaviour.…”

Section: Benchmark Controlmentioning

confidence: 99%

“…A comprehensive survey of bottlenecks in Swedish DHNs carried out by Brange et al [7] indicates that network congestion is a concern of the majority of the DH companies. Their research shows that half of the bottlenecks originated from network expansion, followed by densification of load connections and the interconnection of multiple DHNs.…”

Section: Introductionmentioning

confidence: 99%

Demand side management in urban district heating networks

et al. 2018

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Bottlenecks in district heating systems and how to address them

Cited by 20 publications

References 42 publications

Smart Asset Management for District Heating Systems in the Baltic Sea Region

Smart Asset Management for District Heating Systems in the Baltic Sea Region

Integration of geothermal water into secondary network by absorption-heat-pump-assisted district heating substations

Demand side management in urban district heating networks

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