Development of an Innovative Low Temperature Heat Supply Concept for a New Housing Area

Schmidt, Dietrich; Kallert, Anna; Orozaliev, Janybek; Best, Isabelle; Vajen, Klaus; Reul, Oliver; Bennewitz, Jochen; Gerhold, Petra

doi:10.1016/j.egypro.2017.05.053

Cited by 10 publications

(4 citation statements)

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“…Geo-solar local heat supply for residential area "Zum Feldlager" in Kassel [54,84]. Future DH solution for residential district were developed in Hyvinkää, Finland [85,86].…”

Section: Examples Of Implementation Of Ltdhmentioning

confidence: 99%

Future Trends in District Heating Development

Tereshchenko

Nord

2018

Curr Sustainable Renewable Energy Rep

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Purpose of review: This article describes challenges that should be overcome towards implementation of low temperature district heating (LTDH). The trends in development, operational issues and legislative framework were revised. Recent findings:The new substation design with solutions to avoid legionella bacteria issue, improved network topology and control strategies, opportunities of LTDH for buildings under various renovation stages and construction year were identified as the most crucial for the transition to 4 th generation district heating (DH). Importance of heat load aggregation to avoid peak load issue in the areas with low energy buildings (LEB) and solutions for transition from high temperature to low temperatures in the DH network have been shown. Summary:The findings indicate that there is a huge potential for achieving low carbon society and improvement in energy efficiency under transition to LTDH. The solutions for transition from high temperature DH to LTDH exist, however they need good policies and market availability to be implemented.

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“…Geo-solar local heat supply for residential area "Zum Feldlager" in Kassel [54,84]. Future DH solution for residential district were developed in Hyvinkää, Finland [85,86].…”

Section: Examples Of Implementation Of Ltdhmentioning

confidence: 99%

Future Trends in District Heating Development

Tereshchenko

Nord

2018

Curr Sustainable Renewable Energy Rep

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“…The efficiency of a large-scale solar collector field can be increased by lowering DHN temperature regimes. Schmidt et al [12] presented an analysis of a DH system with solar heating and heat pumps (HPs) using geothermal energy for a new residential area. Low potential geothermal heat was explored as a heat source for a LTDHN in [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…Ristimäki et al [22] compared various DH configurations for heat distribution in the Härmälänranta district located in Tampere, Finland, by combining life-cycle and life-cycle cost analyses. Schmidt et al [12] compared alternative scenarios for the LTDHN in the residential area Zum Feldlager located in Kassel, Germany. Primary energy consumption, CO2 emissions and space requirements for the installation of the supply components were chosen as technical indicators; annual heating costs, price stability, and amortisation period were used as economic indicators.…”

Section: Introductionmentioning

confidence: 99%

Small low-temperature district heating network development prospects

Volkova

Krupenski

Pieper³

et al. 2019

Energy

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“…Most of the plants built in Germany and Denmark are centralized plants. The solar district heating network plants are mostly operated at higher temperatures [45]. The storage and distribution network are usually centralized.…”

Section: Introductionmentioning

confidence: 99%

Performance comparison between optimized design of a centralized and semi-decentralized community size solar district heating system

2018

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Solar thermal energy is widely recognized as one of the most important renewable energy resources. However, in high latitudes, due to various climatic and mismatch challenges, such solar district heating networks are difficult to implement. The objective of the paper is to optimize and compare two different design layouts and control strategies for solar district heating systems in Finnish conditions. The two different designs proposed are a centralized and a semidecentralized solar district heating system. The centralized system consists of two centralized short-term tanks operating at different temperature levels charged by a solar collector and heat pumps. Borehole thermal energy storage is also charged via these two centralized tanks. In contrast, the semi-decentralized system consists of one centralized low temperature tank charged by a solar collector and a borehole thermal energy storage and decentralized high temperature tank charged by an individual heat pump in each house. In this case, borehole thermal energy storage is charged only by the centralized warm tank. These systems are designed using the dynamic simulation software TRNSYS for Finnish conditions. Later on, multi-objective optimization is carried out with a genetic algorithm using the MOBO (Multiobjective building optimizer) optimization tool, where two objectives, i.e. purchased electricity and life cycle costs, are minimized. Various design variables are considered, which included both component sizes and control parameters as inputs to the optimization. The optimization results show that in terms of life cycle cost and purchased electricity, the decentralized system clearly outperforms the centralized system. With a similar energy performance, the reduction in life cycle cost is up to 35% for the decentralized system. Both systems can achieve close to 90% renewable energy fraction. These systems are also sensitive to the prices. Furthermore, the results show that the solar thermal collector area and seasonal storage volume can be reduced in a decentralized system to reduce the cost compared to a centralized system. The losses in the centralized system are 40 -12% higher compared to the decentralized system. The results also show that in both systems, high performance is achieved when the borehole storage is wider with less depth, as it allows better direct utilization of seasonally stored heat. The system layout and controls varied the performance and life cycle cost; therefore it is essential to consider these when implementing such systems.

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Development of an Innovative Low Temperature Heat Supply Concept for a New Housing Area

Cited by 10 publications

References 0 publications

Future Trends in District Heating Development

Future Trends in District Heating Development

Small low-temperature district heating network development prospects

Performance comparison between optimized design of a centralized and semi-decentralized community size solar district heating system

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