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Experimental research of thermohydraulic dispatcher operating regimes
https://doi.org/10.24223/1999-5555-2019-12-2-106-112
Abstract
Heat carrier transportation in district heating (DH) systems is an issue of a significant energy saving potential. This potential can be achieved by applying a thermohydraulic dispatcher (THD) into DH systems. THD is a vertical or horizontal shunt pipe of a large diameter with relatively low hydraulic resistance in comparison with that of connected circuits. Installation of THD along with distributed variable speed pumps in DH systems can lead to reducing or even eliminating electric energy losses caused by throttling of redundant hydraulic head. It also leads to decreasing pressure in heat supply network which improves reliability of the network. But the opportunity of further rational implementation of THD in DH systems is limited because of insufficient amount of theoretical and experimental research. This paper is concerned with the experimental research of THD operating regimes. Already known aspects of THD operation were checked and proved. New dependencies were obtained for bypassing regime and for mixing regime of THD. Besides, different types of the primary circuit connection to THD were considered: connection for non-condensing boilers and connection for condensing boilers. Simplified models describing bypassing and mixing regimes of THD were proposed. It is possible to estimate return temperature of primary circuit with the help of the bypassing regime model with an error less than 1%. At the same time the mixing regime model is suitable for finding supply temperatures of primary circuits with an error less than 2%.
The results of this paper can be used for further research and development of DH systems with THD. Such systems could be traditional as well as prospective ones (low temperature and pressure DH systems).
About the Authors
D. O. Romanov
Moscow Power Engineering Institute
Russian Federation
14 Krasnokazarmennaya str., 111250, Moscow
Russian Federation
14 Krasnokazarmennaya str., 111250, Moscow
Y. V. Yavorovsky
Moscow Power Engineering Institute
Russian Federation
14 Krasnokazarmennaya str., 111250, Moscow
Russian Federation
14 Krasnokazarmennaya str., 111250, Moscow
V. V. Smirnov
Moscow Power Engineering Institute
Russian Federation
14 Krasnokazarmennaya str., 111250, Moscow
Russian Federation
14 Krasnokazarmennaya str., 111250, Moscow
References
1. Volkov A. V., Parygin A. G., Ryzhenkov V. A. et al. Receiving of electric energy in district heating systems based on redundant main line pressure recuperation. Novosti teplosnabzheniya 2007; (10): 46– 50. (In Russ.)
2. Volkov A. V., Ryzhenkov V. A., Parygin A. G. et al. Increasing of reliability and efficiency of district heating systems based on effective utilisation of redundant main line pressure. Nadezhnost' i bezopasnost' energetiki 2010; (2): 45–47. (In Russ.)
3. Chernenkov V. P., Makarov D. A., Lihachev I. D. et al. Increasing the energy efficience of the heat supply system with the help of the device for recuperation of throttling head. FEFU: School of engineering bulletin 2018; (2): 86–91. (In Russ.)
4. Yan A., Zhao J., An Q. et al. Hydraulic performance of a new district heating systems with distributed variable speed pumps. Applied Energy 2013; (112): 876–885.
5. Sheng X., Duanmu L. Electricity consumption and economic analyses of district heating system with distributed variable speed pumps. Energy and Buildings 2016; (118): 291–300.
6. Wang H., Wang H., Zhu T. A new hydraulic regulation method on district heating system with distributed variable speed pumps. Energy Conversion and Management 2017; (147): 174–189.
7. Sennikov V. V., Genvarev А. А., Yavorovsky Y. V. et al. Application of Thermal Hydraulic Distributor in Substations of District Heating Systems. Vestnik IGEU 2012; (5): 1–7. (In Russ.) 8. Lund H., Werner S. et al. 4th Generation District Heating (4GDH). Integrating smart thermal grids into future sustainable energy systems. Energy 2014; (68): 1–11.
8. Lund H., Duic N. Smart energy systems and 4th generation district heating. Energy 2016; (110): 1–4.
9. Romanov D. O., Yavorovsky Y. V. et al. Experimental research and numerical simulation of thermohydraulic dispatcher operating regimes. В: Energy saving — theory and practice: Materials of 9th International school-seminar of young scientists and specialists. М.: Izdatelsky dom MEI 2018. (In Russ.)
Review
For citations:
Romanov D.O., Yavorovsky Y.V., Smirnov V.V. Experimental research of thermohydraulic dispatcher operating regimes. Safety and Reliability of Power Industry. 2019;12(2):106-112. (In Russ.) https://doi.org/10.24223/1999-5555-2019-12-2-106-112
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