Modified finite volumes method for the simulation of dynamic district heating networks

Schwarz, Manuel Betancourt; Mabrouk, Mohamed Tahar; Silva, Carlos Santo; Haurant, Pierrick; Lacarrière, Bruno

doi:10.1016/j.energy.2019.06.038

Cited by 19 publications

(4 citation statements)

References 33 publications

(47 reference statements)

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“…The constraints for the CHP units, DHN, heat exchangers, radiators and buildings have been reported in our previous study. 20 (6) Constraints of the electric boiler Assuming that the power-heat conversion efficiency of the EBs was 100%, the constraints of the EBs are described by equations ( 14) and (15).…”

Section: Constraintsmentioning

confidence: 99%

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Operational cost and wind power integration capacities of the integrated heat and power dispatch (IHPD) system under different heating regulation modes and time steps

Zhang,

Zheng,

Zhu

et al. 2024

Indoor and Built Environment

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The utilization of the district heating system (DHS) thermal inertia is greatly influenced by heating regulation modes and time steps, however, which has been rarely analysed in almost all integrated heat and power dispatch system (IHPD) models, for the purpose of wind power integration. In this study, an IHPD model considering the thermal inertia of the DHS was established, in which a data interaction problem amongst the power sources, heat sources and district heating networks was solved. Thereafter, four most commonly used heating operation modes and different heating regulation time steps were applied to the IHPD model, respectively, to analyse and compare their effects on the IHPD system under different operation conditions, mainly considering the operation cost and the wind power integration. Results of the case studies showed that the variable flow and variable supply temperature mode produced the lowest operation cost of the IHPD system during a whole heating season. Consequently, this mode is recommended to be applied in the optimization operation of the IHPD system with the wind power integration. Meanwhile, a heating regulation time step within 3 h could make full use of the DHS thermal inertia, thus to improve the operational flexibility of the IHPD system.

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Section: Constraintsmentioning

confidence: 99%

“…The different temperatures and flow rates also led to different transmission delay time that was regarded as the thermal inertia of the DHS and heat loss. 15 As a result, the heating regulation modes can affect the operation cost and wind power integration of the IHPD system.…”

Section: Introductionmentioning

confidence: 99%

Operational cost and wind power integration capacities of the integrated heat and power dispatch (IHPD) system under different heating regulation modes and time steps

Zhang,

Zheng,

Zhu

et al. 2024

Indoor and Built Environment

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“…Heat is distributed from the secondary side of the heat exchange station to the end users in the distribution system. The transmission and distribution systems are indirectly connected through heat exchangers [27][28][29]. At present, most of the transmission DHS in northern part of China use the CF-VT control strategy.…”

Section: Model Of Dhs Considering a New Thermal Characteristic Indexmentioning

confidence: 99%

Optimal Scheduling of Thermoelectric Coupling Energy System Considering Thermal Characteristics of DHN

Tang²,

et al. 2022

Sustainability

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In a thermoelectric coupling energy system, renewable energy is often curtailed by the uncertainty of the power generation. Besides, the integration of renewable energy is restricted by the inflexible operation of combined heat and power units due to the strong coupling relationship between power generation and heating supply, especially in winter. Utilization of the district heating network, a heat storage feature, is a cost-effective measure to improve the overall system operational flexibility. In this paper, a new heat characteristic index is proposed in a district heating system, which is applied to measure the impact of the flexibility of combined heat and power units’ output. Furthermore, in order to increase the reliability of an electric power system, a probabilistic model of combined heat and power units’ spinning reserves capacity related to confidence level K is established. What is more, the two indexes K and thermal characteristic index have a coupled relationship. In addition, for model solving methodology, the discretized step transformation and constant mass flow and variables temperature method is adopted to transform the non-linear system model into linear programming form. Case studies are carried out to show the linkage between system costs, K and thermal characteristic index. The optimal result can achieve balance among the system reliability, flexibility and economy.

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“…The pipe model is an explicit transient first-order upwind finite volume model, as has been used before in the literature [51][52][53][54][55][56][57][58]. The energy balance of one finite volume is described in Equation (A1).…”

Section: Acknowledgmentsmentioning

confidence: 99%

Analysis of Building Parameter Uncertainty in District Heating for Optimal Control of Network Flexibility

et al. 2020

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Network flexibility is the use of the thermal capacity of water that is contained in the district heating network pipes to store energy and shift the heat load in time. Through optimal control, this network flexibility can aid in applications such as peak shaving and operational heat pump optimisation. Yet, optimal control requires perfect predictions and complete knowledge of the system characteristics. In reality, this is not the case and uncertainties exist. To obtain insight into the importance of these uncertainties, this paper studies the influence of imperfect knowledge of building parameters on the optimal network flexibility activation and its performance. It is found that for the optimisation of heat pump operation, building parameter uncertainties do not present large risks. For peak shaving, a more robust result can be achieved by activating more network flexibility than may be required.

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Modified finite volumes method for the simulation of dynamic district heating networks

Cited by 19 publications

References 33 publications

Operational cost and wind power integration capacities of the integrated heat and power dispatch (IHPD) system under different heating regulation modes and time steps

Operational cost and wind power integration capacities of the integrated heat and power dispatch (IHPD) system under different heating regulation modes and time steps

Optimal Scheduling of Thermoelectric Coupling Energy System Considering Thermal Characteristics of DHN

Analysis of Building Parameter Uncertainty in District Heating for Optimal Control of Network Flexibility

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