Development of a model for thermal-hydraulic analysis of helically coiled tube once-through steam generator based on Modelica

Ding, Hao; Zhang, Yaoli; Yang, Kai; Hong, Gang

doi:10.1016/j.anucene.2019.107069

Cited by 13 publications

(2 citation statements)

References 18 publications

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“…The helically coiled tube is not only compact in structure, but also has a high heat transfer coefficient. 1–4 Moreover, the CHF in the helical tube is higher than that in the straight tube within the high-quality region. 5,6 However, the CHF mechanism and characteristics inside a helical tube may be more complicated due to centrifugal force and secondary flow.…”

Section: Introductionmentioning

confidence: 96%

Experimental study on critical heat flux during flow boiling of R134a in a vertical helically coiled tube

Niu

Yuan

Zhao

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper carried out an experimental study on the critical heat flux during flow boiling of R134a in a vertical helically coiled tube. The length, inner diameter, coil diameter, and pitch of the test tube were 1.85 m, 8 mm, 205 mm, and 25 mm, respectively. Experiments cover the mass flux range of 190–400 kg·m−2·s−1, heat flux of 15–55 kW·m−2, inlet pressure of 0.8–1.1 MPa, and inlet vapor quality of 0.01–0.35. The effects of critical heat flux identification method, mass flux, system pressure, and inlet vapor quality on critical heat flux were presented. The critical heat flux obtained by the wall temperature rise method was larger than that obtained by the wall temperature oscillation method. The deviation of the critical heat flux corresponding to two methods, including wall temperature rises sharply above 10 ℃ and wall temperature drastic oscillation, was about 20% under the present experimental conditions. The critical heat flux increased with mass flux while it decreased with the inlet vapor quality and pressure. The experiment data were compared with four existing empirical correlations. A new correlation is proposed for critical heat flux prediction in vertical helical tubes.

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Section: Introductionmentioning

confidence: 96%

Experimental study on critical heat flux during flow boiling of R134a in a vertical helically coiled tube

Niu

Yuan

Zhao

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Therefore, only changing the library, the proposed simulator may allow advanced users to change between different languages to define the simulation. Some examples of languages could be Network Simulator 3 (NS-3) [49], C++ [50], or Modelica [51][52][53], each one with its advantages and disadvantages. However, most of these languages have a complex learning curve and are not traditionally used by SCADA users.…”

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confidence: 99%

Operational Simulation Environment for SCADA Integration of Renewable Resources

et al. 2020

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The complexity of power systems is rising mainly due to the expansion of renewable energy generation. Due to the enormous variability and uncertainty associated with these types of resources, they require sophisticated planning tools so that they can be used appropriately. In this sense, several tools for the simulation of renewable energy assets have been proposed. However, they are traditionally focused on the simulation of the generation process, leaving the operation of these systems in the background. Conversely, more expert SCADA operators for the management of renewable power plants are required, but their training is not an easy task. SCADA operation is usually complex, due to the wide set of information available. In this sense, simulation or co-simulation tools can clearly help to reduce the learning curve and improve their skills. Therefore, this paper proposes a useful simulator based on a JavaScript engine that can be easily connected to any renewable SCADAs, making it possible to perform different simulated scenarios for novel operator training, as if it were a real facility. Using this tool, the administrators can easily program those scenarios allowing them to sort out the lack of support found in setting up facilities and training of novel operator tasks. Additionally, different renewable energy generation models that can be implemented in the proposed simulator are described. Later, as a use example of this tool, a study case is also performed. It proposes three different wind farm generation facility models, based on different turbine models: one with the essential generation turbine function obtained from the manufacturer curve, another with an empirical model using monotonic splines, and the last one adding the most important operational states, making it possible to demonstrate the usefulness of the proposed simulation tool.

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Study on the systematic thermal-hydraulic characteristics of helical coil once-through steam generator

Yao

Chen

et al. 2021

Annals of Nuclear Energy

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Development of a model for thermal-hydraulic analysis of helically coiled tube once-through steam generator based on Modelica

Cited by 13 publications

References 18 publications

Experimental study on critical heat flux during flow boiling of R134a in a vertical helically coiled tube

Experimental study on critical heat flux during flow boiling of R134a in a vertical helically coiled tube

Operational Simulation Environment for SCADA Integration of Renewable Resources

Study on the systematic thermal-hydraulic characteristics of helical coil once-through steam generator

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