A review of low-temperature sub-networks in existing district heating networks: examples, conditions, replicability

Puschnigg, Stefan; Jauschnik, Gabriela; Moser, Simon; Volkova, Anna; Linhart, Matthias

doi:10.1016/j.egyr.2021.09.044

Cited by 13 publications

(4 citation statements)

References 9 publications

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“…The model is explained in detail in [48]. Equation (7) shows the general approach, where COP is the calculated COP of the booster heat pump, while COP Lor is the theoretical Lorenz COP of the heat pump. To obtain the realistic value, Lorenz efficiency η Lor is used.…”

Section: Booster Heat Pumpmentioning

confidence: 99%

“…The temperatures are decreasing with each upcoming generation of district heating, reaching around 55 • C for the so-called 4th generation district heating [6]. Low-temperature networks are even commonly integrated into existing high-temperature systems as a sub-network [7]. However, during the last several years, the new generation has been defined, usually called 5th generation [8,9], which enables the higher utilization of low-temperature waste heat sources and unlocks the possibility of bidirectionality in thermal networks [10].…”

Section: Introductionmentioning

confidence: 99%

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Technical and Economic Assessment of Supermarket and Power Substation Waste Heat Integration into Existing District Heating Systems

et al. 2022

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District heating systems are almost always located in densely populated urban areas where various heat sources are available, such as cooling and refrigeration systems in supermarkets, shopping malls, and power transformers. These urban sources often have a large share of waste heat, which is usually emitted into the environment. This waste heat could be used to partially cover the thermal load in district heating systems. The biggest challenge for their integration is the spatial distribution of urban heat sources in relation to the existing heat network and the temporal distribution of the availability of waste heat energy throughout the year. In this paper, we have developed an economic assessment model for the integration of urban heat sources into existing district heating systems. By the hourly merit order of waste heat utilization technologies based on pinch analysis, we have defined the most suitable integration of urban heat sources into existing district heating systems. Different temperature regimes of the urban source and the existing heat network have been considered. Finally, the method was tested on the case study of a supermarket and power substation located in Zagreb, while the sensitivity analysis was carried out with a focus on various technical and economic boundary conditions.

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Section: Booster Heat Pumpmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Technical and Economic Assessment of Supermarket and Power Substation Waste Heat Integration into Existing District Heating Systems

et al. 2022

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“…Examples include Hamburg-Wilhelmsburg, implemented in 2019 [25], and H€ oje Tåstrup-S€ onderby, implemented in 2012 [26]. This configuration is further explored in the CASCADE project presented within Annex XIII of the IEA-DHC programme [27] and in Refs. [28,29].…”

Section: Ultra-lowmentioning

confidence: 99%

Network configurations for implemented low-temperature district heating

Werner

2022

Energy

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“…District heating networks (DHN) are a well-known solution to lower the carbon footprint for heating in winter and recover otherwise unused waste heat (Puschnigg et al, 2021). However, DHN suffers from two important drawbacks, which limits their energy efficiency and operability: 1) Low efficiency caused by high operating temperatures, especially high return temperatures.…”

Section: Introductionmentioning

confidence: 99%

Optimized Adsorption Heat Pump for Efficiency Increase of District Heating Networks

Piccoli,

Civioc,

Galmarini

et al. 2022

Proceedings of EuroSun 2022 - ISES and IEA SHC International Conference on Solar Energy for Buildings and Industry

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Adsorption heat pumps can provide cooling based on renewable district heat or waste heat, thus expanding the scope of district heating networks (DHN) and making better use of existing renewable heat sources. On the other hand, they can also provide heat while significantly reducing the return flow of the district heating network, thus increasing the efficiency of district heating supply. However, commercially available sorption machines are not designed for DHN. Therefore, new and sustainable adsorbent materials ideally suited for the temperatures and applications of district heating networks are developed and incorporated in a heat & mass exchanger designed for reversible adsorption heat pumps. The new sorption heat and mass exchanger is subjected to performance measurements. The results are used to carry out simulations to demonstrate the advantages of adsorption heat pumps for the supply of cooling and heating in district heating networks.

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A review of low-temperature sub-networks in existing district heating networks: examples, conditions, replicability

Cited by 13 publications

References 9 publications

Technical and Economic Assessment of Supermarket and Power Substation Waste Heat Integration into Existing District Heating Systems

Technical and Economic Assessment of Supermarket and Power Substation Waste Heat Integration into Existing District Heating Systems

Network configurations for implemented low-temperature district heating

Optimized Adsorption Heat Pump for Efficiency Increase of District Heating Networks

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