Dynamic Modeling of Rankine Cycle using Arbitrary Lagrangian Eulerian Method

Dynamic Modeling of Rankine Cycle using Arbitrary Lagrangian Eulerian Method

Bibliographic Details
Main Author: Ranade, Vishakhdutt
Language:English
Published: University of Cincinnati / OhioLINK 2017
Subjects:
Mechanical Engineering
Rankine Cycle
Arbitrary Lagrangian Eulerian
ALE
Lagrangian
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=ucin1491562460235764
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-ucin14915624602357642021-08-03T07:01:32Z Dynamic Modeling of Rankine Cycle using Arbitrary Lagrangian Eulerian Method Ranade, Vishakhdutt Mechanical Engineering Rankine Cycle Arbitrary Lagrangian Eulerian ALE Lagrangian Thermoelectric power plants are often based on Rankine cycle where the steam is cooled using water from a lake or a river. This water is recirculated in a cooling tower where a portion of the cooling water is lost to evaporation. To reduce water consumption in thermoelectric power plants, there is an urgent need to develop efficient air-cooled condensers for Rankine cycles. To this end, understanding how the Rankine cycle performance changes with diurnal temperature variation is essential. In the present study, a computational model was developed to simulate the transient behavior of a Rankine cycle and its response to changing ambient air temperature. The computation model is based on the Arbitrary Lagrangian Eulerian method incorporating the merits of Lagrangian and Eulerian techniques aiming towards a higher computational efficiency while accurately tracking the H2O mass moving through the boiler, turbine, condenser, and the pump. The model was developed using MATLAB and validated using available data. The model was first applied to simulate transient dynamics of a vapor compression cycle for which data were readily available in the literature. The validated model was then used to simulate a Rankine cycle. Parameters of interest for the computation included the delivery conditions for boiler, turbine, condenser and the resulting power output. Simulations were run with varying ambient temperature throughout the day. The maximum ambient temperature was varied to represent four locations in different regions of the United States. These results were compared to cycle operation under air pre-cooling which maintains a fixed maximum air temperature reaching the condenser. When the ambient air temperature increases, the condenser temperature and consequently its pressure increases. This results in a decrease in the turbine power output. This reduction in power output can be mitigated by maintaining the temperature of the air going to the condenser at the design condition. The increase in cycle efficiency obtained with air pre-cooling is plotted for four different locations. The developed computational model based on the Arbitrary-Lagrangian-Eulerian method is able to accurately capture the transient variation in Rankine cycle performance with varying ambient conditions. 2017-06-16 English text University of Cincinnati / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ucin1491562460235764 http://rave.ohiolink.edu/etdc/view?acc_num=ucin1491562460235764 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Mechanical Engineering
Rankine Cycle
Arbitrary Lagrangian Eulerian
ALE
Lagrangian
spellingShingle Mechanical Engineering
Rankine Cycle
Arbitrary Lagrangian Eulerian
ALE
Lagrangian
Ranade, Vishakhdutt
Dynamic Modeling of Rankine Cycle using Arbitrary Lagrangian Eulerian Method
author Ranade, Vishakhdutt
author_facet Ranade, Vishakhdutt
author_sort Ranade, Vishakhdutt
title Dynamic Modeling of Rankine Cycle using Arbitrary Lagrangian Eulerian Method
title_short Dynamic Modeling of Rankine Cycle using Arbitrary Lagrangian Eulerian Method
title_full Dynamic Modeling of Rankine Cycle using Arbitrary Lagrangian Eulerian Method
title_fullStr Dynamic Modeling of Rankine Cycle using Arbitrary Lagrangian Eulerian Method
title_full_unstemmed Dynamic Modeling of Rankine Cycle using Arbitrary Lagrangian Eulerian Method
title_sort dynamic modeling of rankine cycle using arbitrary lagrangian eulerian method
publisher University of Cincinnati / OhioLINK
publishDate 2017
url http://rave.ohiolink.edu/etdc/view?acc_num=ucin1491562460235764
work_keys_str_mv AT ranadevishakhdutt dynamicmodelingofrankinecycleusingarbitrarylagrangianeulerianmethod
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