Operation stability analysis of district heating substation from the control perspective

Wang, Yaran; You, Shijun; Zhang, Huan; Zheng, Xuejing; Wei, Shen; Miao, Qing; Zheng, Wandong

doi:10.1016/j.enbuild.2017.08.034

Cited by 23 publications

(6 citation statements)

References 13 publications

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“…The discrepancy between the supply and return DH network temperatures has to ensure warming up to 60 °C due to Legionella issue. More information on the operation of plate heat exchangers is available in [34].…”

Section: Methodsmentioning

confidence: 99%

The Impact of the Future Fluctuating Energy Consumption on a District Heating System: Case Study of Omsk and Krasnoyarsk Cities

Чичерин

Zhuikov

Kolosov

et al. 2021

Environmental and Climate Technologies

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Temperature difference between supply and return distribution medium (water) is a vital factor when assessing the efficiency of a district heating (DH) substation. An accounting for fluctuations and differences of the heat consumption/generation is the key problem in planning DH system operation. The influence of the fluctuating energy consumption on a DH system was studied with actual data, using the DH systems of the Russian cities Krasnoyarsk and Omsk as a case study. Information is visualized in the form of graphs and charts, orderly and clearly comparing certain points. The data includes supply and return temperatures, and heat demand. Clearly visible state of high return temperatures induces more bottleneck problems as the flow increases. At the same time, in 2019, the total heat demand was 21 008 MW. This is more than 5 % than in 2020, assuming 100 % of consumers connected. The reasons for this trend are: decreasing total housing area, no incentive for the buildings in newly built-up areas to be connected to the DH system, poor service motivating business facilities to disconnect from the system. When the primary energy consumption related to the warmer climate and behaviour of business sector decreases, the DH system requires renovation. It is possible to reduce network return temperature during some months of the year. The reason is that, a high temperature difference is essential to maintain high efficiency and minimize fuel and pumping cost, it also enables more customers to be connected to a DH system without increasing pipe dimensions of a network.

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Section: Methodsmentioning

confidence: 99%

The Impact of the Future Fluctuating Energy Consumption on a District Heating System: Case Study of Omsk and Krasnoyarsk Cities

Чичерин

Zhuikov

Kolosov

et al. 2021

Environmental and Climate Technologies

View full text Add to dashboard Cite

show abstract

“…Even at low mass flow rate, the Reynolds number is quite high. Similar to [6], after rearranging Equation (9) to get temperature dependent and mass flow dependent parts separated, the expression becomes…”

Section: Modeling Of Overall Heat Transfer Coefficientmentioning

confidence: 99%

Modelling and Analysis of Plate Heat Exchangers for Flexible District Heating Systems

Chyhryn

2019

Energies

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Seamless integration of district heating (DH) and power systems implies their flexible operation, which extends their typical operational boundaries and, thus, affects performance of key components, such as plate heat exchangers (PHXs). Despite that the heat transfer in a PHX is regulated by mass flows, flexible operation and demand variations cause shifts in temperature levels, which affects the system operation and must be efficiently accounted for. In this paper, an overall heat transfer coefficient (OHTC) model with direct relation to temperature is proposed. The model is based on a linear approximation of thermophysical components of the forced convection coefficient (FCC). On one hand, it allows to account for temperature variations as compared to mass flow-based models, thus, improving accuracy. On the other hand, it does not involve iterative lookup of thermophysical properties and requires fewer inputs, hence, reducing computational effort. The proposed linear model is experimentally verified on a laboratory PHX against estimated correlations for FCC. A practical estimation procedure is proposed based on component data. Additionally, binding the correlation to one of varying parameters shows reduction in the heat transfer error. Finally, operational optimization test cases for a basic DH system demonstrate better performance of the proposed models as compared to those previously used.

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“…The controller tuned at a certain operating condition may be unstable when operating condition changes in large range. For example, the operation instability of DH substation may occur at the high primary supply temperature, if the controller is tuned at low primary supply temperature [74]. Incorrect energy meter data may happen if any of these components malfunction [75].…”

Section: Monitoring and Fault Detectionmentioning

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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Operation stability analysis of district heating substation from the control perspective

Cited by 23 publications

References 13 publications

The Impact of the Future Fluctuating Energy Consumption on a District Heating System: Case Study of Omsk and Krasnoyarsk Cities

The Impact of the Future Fluctuating Energy Consumption on a District Heating System: Case Study of Omsk and Krasnoyarsk Cities

Modelling and Analysis of Plate Heat Exchangers for Flexible District Heating Systems

Future Trends in District Heating Development

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