Effects of boosting the supply temperature on pipe dimensions of low-energy district heating networks: A case study in Gladsaxe, Denmark

Tol, Hakan İbrahim; Svendsen, Svend

doi:10.1016/j.enbuild.2014.10.067

Cited by 19 publications

(4 citation statements)

References 22 publications

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“…Tol et al investigated an optimization method that improved the design of DH pipelines based on the simultaneity factor of the heat load for low-temperature networks in Denmark. They compared tree and loop networks, the use of boosting pumps, and the impact of boosting the supply temperature during peaks and concluded that they can both lead to reduced pipe dimensions [40][41][42].…”

Section: Improved Distribution Networkmentioning

confidence: 99%

Double Loop Network for Combined Heating and Cooling in Low Heat Density Areas

et al. 2020

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This study investigated a double loop network operated with ultra-low supply/return temperatures of 45/25 °C as a novel solution for low heat-density areas in Denmark and compared the proposed concept with a typical tree network and with individual heat pumps to each end-users rather than district networks. It is a pump-driven system, where the separate circulation of supply and return flow increased the flexibility of the system to integrate and displace heating and cooling energy along the network. Despite the increased use of central and local water pumps to operate and control the system, the simulated overall pump energy consumption was 0.9% of the total energy consumption. This was also an advantage at the design stage as the larger pressure gradient, up to 570 Pa/m, allowed minimal pipe diameters. In addition, the authors proposed the installation of electrically heated vacuum-insulated micro tanks of 10 L on the primary side of each building substation as a supplementary heating solution to meet the comfort and hygiene requirements for domestic hot water (DHW). This, combined with supply water circulation in the loop network, served as a technical solution to remove the need for bypass valves during summer periods with no load in the network. The proposed double loop system reduced distribution heat losses from 19% to 12% of the total energy consumption and decreased average return temperatures from 33 °C to 23 °C compared to the tree network. While excess heat recovery can be limited due to hydraulic issues in tree networks, the study investigated the double loop concept for scenarios with heat source temperatures of 30 °C and 45 °C. The double loop network was cost-competitive when considering the required capital and operating costs. Furthermore, district networks outperformed individual heat pump solutions for low-heat density areas when waste heat was available locally. Finally, although few in Denmark envisage residential cooling as a priority, this study investigated the potential of embedding heating and cooling in the same infrastructure. It found that the return line could deliver cold water to the end-users and that the maximum cooling power was 1.4 kW to each end-user, which corresponded to 47% of the total peak heat demand used to dimension the double loop network.

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Section: Improved Distribution Networkmentioning

confidence: 99%

Double Loop Network for Combined Heating and Cooling in Low Heat Density Areas

et al. 2020

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“…Municipalities play an important role in development and implementation of the general DH concept. Several 4GDH projects have been implemented in the EU in close cooperation with municipalities [24]. In Latvia, heat supply is provided by using different options: the municipality supplies heat to its residents by performing the functions of the DH utility; this is done by a private DH utility or both options are combined whereby the municipality, a state institution and a private utility form a joint stock company.…”

Section: Case Studymentioning

confidence: 99%

Challenges and Barriers by Transition Towards 4^th Generation District Heating System: A Strategy to Establish a Pricing Mechanism

Osis¹,

Talcis²,

Ziemele³

2019

Latvian Journal of Physics and Technical Sciences

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Transition of the district heating (DH) system to the 4th generation system involves several challenges, which refer not only to the introduction of state-of-art technologies, but also to the development of a sustainable pricing methodology. Introduction of the 4th generation systems will soon force the DH industry to solve issues regarding the possibility of organisation of the market in the same way as it happened in the power industry (Directive 2009/72/EC) by complete separation of producers from the transmission system service providers. The present article discusses various development scenarios of a DH utility within the framework of an organised market and their pricing methodologies, as well as evaluates their sustainability considering the transition to the 4th generation system.

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“…Alternative solutions to eliminate congestion are raising supply temperature and lowering return temperature. Tol et al [20] investigate optimal pipe dimension design by assuming raised supply temperature when there is high demand. Although varying supply temperature has its merits, frequent cycling between higher and lower temperature stresses the pipes and could contribute to pipe failure, as Vandermeulen at al.…”

Section: State-of-the-art Dhn Operation and Optimizationmentioning

confidence: 99%

Demand side management in urban district heating networks

et al. 2018

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Effects of boosting the supply temperature on pipe dimensions of low-energy district heating networks: A case study in Gladsaxe, Denmark

Cited by 19 publications

References 22 publications

Double Loop Network for Combined Heating and Cooling in Low Heat Density Areas

Double Loop Network for Combined Heating and Cooling in Low Heat Density Areas

Challenges and Barriers by Transition Towards 4^th Generation District Heating System: A Strategy to Establish a Pricing Mechanism

Demand side management in urban district heating networks

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Effects of boosting the supply temperature on pipe dimensions of low-energy district heating networks: A case study in Gladsaxe, Denmark

Cited by 19 publications

References 22 publications

Double Loop Network for Combined Heating and Cooling in Low Heat Density Areas

Double Loop Network for Combined Heating and Cooling in Low Heat Density Areas

Challenges and Barriers by Transition Towards 4th Generation District Heating System: A Strategy to Establish a Pricing Mechanism

Demand side management in urban district heating networks

Contact Info

Product

Resources

About

Challenges and Barriers by Transition Towards 4^th Generation District Heating System: A Strategy to Establish a Pricing Mechanism