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Selecting the cooling water mass flow rate for a power plant under variable load with entropy generation rate minimization

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  • Laskowski, Rafał
  • Smyk, Adam
  • Lewandowski, Janusz
  • Rusowicz, Artur
  • Grzebielec, Andrzej

Abstract

The paper deals with selecting the mass flow rate of cooling water under variable load of a power unit such that optimum operating parameters of the unit can be achieved. The change in the cooling water mass flow rate influences the resistance to flow (on the cooling water side) and the pressure of the condensing steam. A higher cooling water mass flow rate increases the resistance to flow and power supplied to the cooling water pump, but it also results in a drop in the condensing steam pressure and an increase in the power generated in the LP (low-pressure) part of the turbine. Since the change in the mass flow rate affects the performance of the condenser, the LP part of the turbine, and the cooling water pump, a system comprising these components was analyzed. The cooling water mass flow rate was chosen via minimization of the total entropy generation rate in these components and a change in the unit's power output defined as a difference between the power outputs of the LP part of the turbine and the cooling water pump. The aim of this paper is to find the optimum value of the mass flow rate of cooling water under variable load of the power plant.

Suggested Citation

  • Laskowski, Rafał & Smyk, Adam & Lewandowski, Janusz & Rusowicz, Artur & Grzebielec, Andrzej, 2016. "Selecting the cooling water mass flow rate for a power plant under variable load with entropy generation rate minimization," Energy, Elsevier, vol. 107(C), pages 725-733.
    • Handle: RePEc:eee:energy:v:107:y:2016:i:c:p:725-733
    DOI: 10.1016/j.energy.2016.04.074
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    References listed on IDEAS

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    1. Guo, Jiangfeng & Xu, Mingtian & Cheng, Lin, 2009. "The application of field synergy number in shell-and-tube heat exchanger optimization design," Applied Energy, Elsevier, vol. 86(10), pages 2079-2087, October.
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    Cited by:

    1. Wu, Tao & Ge, Zhihua & Yang, Lijun & Du, Xiaoze, 2019. "Transient behavior of the cold end system in an indirect dry cooling thermal power plant under varying operating conditions," Energy, Elsevier, vol. 181(C), pages 1202-1212.
    2. Nithyanandam, K. & Shoaei, P. & Pitchumani, R., 2021. "Technoeconomic analysis of thermoelectric power plant condensers with nonwetting surfaces," Energy, Elsevier, vol. 227(C).
    3. El-Behery, Samy M. & Hussien, A.A. & Kotb, H. & El-Shafie, Mostafa, 2017. "Performance evaluation of industrial glass furnace regenerator," Energy, Elsevier, vol. 119(C), pages 1119-1130.
    4. Gu, Yandong & Pei, Ji & Yuan, Shouqi & Wang, Wenjie & Zhang, Fan & Wang, Peng & Appiah, Desmond & Liu, Yong, 2019. "Clocking effect of vaned diffuser on hydraulic performance of high-power pump by using the numerical flow loss visualization method," Energy, Elsevier, vol. 170(C), pages 986-997.
    5. Saghi, Hassan & Lakzian, Esmail, 2017. "Optimization of the rectangular storage tanks for the sloshing phenomena based on the entropy generation minimization," Energy, Elsevier, vol. 128(C), pages 564-574.
    6. Xin Wang & Gang Zhao & Xinhe Qu & Xiaoyong Yang & Jie Wang & Peng Wang, 2023. "Influence of Cooling Water Parameters on the Thermal Performance of the Secondary Circuit System of a Modular High-Temperature Gas-Cooled Reactor Nuclear Power Plant," Energies, MDPI, vol. 16(18), pages 1-17, September.
    7. Fang, Lide & Liu, Yueyuan & Zheng, Meng & Liu, Xu & Lan, Kang & Wang, Fan & Yan, Xiaoli, 2023. "A new type of velocity averaging tube vortex flow sensor and measurement model of mass flow rate," Energy, Elsevier, vol. 283(C).
    8. El-Shafie, Mostafa & Kambara, Shinji & Hayakawa, Yukio & Hussien, A.A., 2021. "Integration between energy and exergy analyses to assess the performance of furnace regenerative and ammonia decomposition systems," Renewable Energy, Elsevier, vol. 175(C), pages 232-243.
    9. Laskowski, Rafał & Smyk, Adam & Rusowicz, Artur & Grzebielec, Andrzej, 2020. "A useful formulas to describe the performance of a steam condenser in off-design conditions," Energy, Elsevier, vol. 204(C).
    10. Xiao, Liehui & Yang, Minlin & Zhao, Shuaifei & Yuan, Wu-Zhi & Huang, Si-Min, 2019. "Entropy generation analysis of heat and water recovery from flue gas by transport membrane condenser," Energy, Elsevier, vol. 174(C), pages 835-847.
    11. Jamil, Ahmad & Javed, Adeel & Wajid, Abdul & Zeb, Muhammad Omar & Ali, Majid & Khoja, Asif Hussain & Imran, Muhammad, 2021. "Multiparametric optimization for reduced condenser cooling water consumption in a degraded combined cycle gas turbine power plant from a water-energy nexus perspective," Applied Energy, Elsevier, vol. 304(C).

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