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Droplet behavior and condensation heat transfer performance on silica nanospring coated surfaces.

Number: 2188

Author(s) : DILLMAN A. R., VUTH A. Y., CORTI G., SOMMERS A. D.

Summary

A fully deterministic simulation model that requires only external boundary conditions as the input parameters is newly developed by experimentally investigating the off-design characteristics of an organic Rankine cycle. The experiment is conducted by varying the boundary conditions of the system to examine the self-adapting features of the internal parameters using R245fa as the working fluid. The formation process of the evaporation and condensation pressure is revealed in terms of controllability and the liquid receiver is designed as a passive method. Mass distribution of various components is elucidated by developing heat exchanger models via discretization method and void fraction model. In addition, the complex mechanism of under- and over-expansion process of the scroll expander is numerically analyzed with the aid of deterministic white-box model. The fully deterministic simulation model of organic Rankine cycle only requires the external boundary conditions as input parameters without using any assumptions. For this, the sub-models of each component are integrated into a three-stage solver reflecting the real-world phenomena of the system. The developed model is verified by inspecting the energy balance of the system which is less than 0.3%. Furthermore, the simulation results are compared to experimental results and the model is validated within 8% error range. Computational cost of the model is greatly reduced by implementing meta-models without compromising the simulation results. The current method is compared to previous modelling methods to observe the effects of assuming internal parameters as input conditions. The simulation model can detect operational failure scenarios and accurately predict the off-design performance of the system. The developed model is fully predictable without imposing internal assumptions and can be utilized for a variety of applications.

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Pages: 10 p.

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  • Original title: Droplet behavior and condensation heat transfer performance on silica nanospring coated surfaces.
  • Record ID : 30030600
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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