New methodology for modeling pressure drop and thermal hydraulic characteristics in long vertical boiler tubes at high pressure

Mali, Chaitanya R.; Vinod, V.; Patwardhan, Ashwin W.

doi:10.1016/j.pnucene.2019.01.026

Cited by 5 publications

(3 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Other mathematical models were developed to describe the pressure drop in superheater heat exchangers [14,15]. Moreover, different computational tools have been used to analyze the phase change process and the pressure drops in boilers [16]. A hybrid mathematical model was used for the dynamic operation of a boiler during transient processes such as hot and cold starts [17].…”

Section: Introductionmentioning

confidence: 99%

Multiobjective Optimization of the Energy Efficiency and the Steam Flow in a Bagasse Boiler

Molina,

Vidal Medina,

Sagastume Gutiérrez

et al. 2023

Sustainability

View full text Add to dashboard Cite

Renewable energy and energy efficiency are essential for a transition to cleaner and sustainable energy. Photovoltaic and wind turbine systems introduce operation, control, protection, and planning issues, particularly affecting frequency stability in the grid. In contrast to more widespread wind turbines and photovoltaic systems, biomass based electricity systems are more stable with no negative impacts on the grid stability. The efficiency of bagasse boilers is essential to guaranteeing adequate economic profit and environmental performance in sugar plants. To realize universal access to affordable, reliable, and modern energy services by 2030 (SDG 7), the use of renewable energy sources in energy mixing and energy efficiency must increase globally. Sugar plants include cogeneration systems to provide heat and electricity to the process and frequently sell an electricity surplus to the grid, which depends on their energy efficiency. Boilers are an essential component of cogeneration systems in sugar plants, and their efficiency is crucial to guarantee electricity surplus. Therefore, this study assessed a bagasse boiler to optimize its operational efficiency. To this end, the exergy assessment and multiobjective optimization based on a genetic algorithm are used. The results show that the exergy efficiency of the boiler improved by 0.8% with the optimization, reducing bagasse consumption by 23 t/d.

show abstract

Section: Introductionmentioning

confidence: 99%

Multiobjective Optimization of the Energy Efficiency and the Steam Flow in a Bagasse Boiler

Molina,

Vidal Medina,

Sagastume Gutiérrez

et al. 2023

Sustainability

View full text Add to dashboard Cite

show abstract

“…For reliable and safe operation, optimization of the operating conditions of the boiler is necessary. Therefore, regarding design and operational tasks, it is essential to have knowledge of the local behavior of thermal-hydraulic characteristics at different operating conditions in the evaporator [ 57 ]. Several previous studies have evaluated WF pressure drop in heat exchangers in different fields of engineering, such as Cioncolini and Santini [ 58 ], Prabakaran et al [ 59 ], Li et al [ 60 ], Zhang and Haglind [ 61 ], or Raju et al [ 62 ].…”

Section: Introductionmentioning

confidence: 99%

“…There are not many studies in the literature that study evaporation by means of CFD simulations in heat exchangers due to the difficulties and challenges previously described. Mali et al [ 57 ] studied pressure drop in vertical tubes for a boiler at high pressure, using the Eulerian–Eulerian model and dividing the length of the tube into different sections regarding vapor fraction. Wang et al [ 80 ] and Shi et al [ 81 , 82 ] used de RPI wall boiling model proposed by Kurul and Podowski [ 83 ] to simulate a particular region of an evaporator, taking advantage of the periodic distribution of the tubes inside the shell to predict the thermal-hydraulic characteristics of the tube.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and CFD Analysis of Pressure Drop in an ORC Boiler for a WHRS Implementation

Paz

Suárez

Cabarcos

et al. 2022

Sensors

View full text Add to dashboard Cite

Waste heat dissipated in the exhaust system of a combustion engine represents a major source of energy to be recovered and converted into useful work. The Waste Heat Recovery System (WHRS) based in an Organic Rankine Cycle (ORC) is an approach for recovering energy from heat sources, achieving a significant reduction in fuel consumption and, as a result, exhaust emissions. This paper studies pressure drop in an ORC shell-and-tubes boiler for a WHRS implementation experimentally and with computational simulations based on a 1-dimensional heat transfer model coupled with 3D calculations. An experimental database is developed, using ethanol in a pressure range of 10–15 absolute bar as working fluid, with mass fluxes inside the tubes in the range of 349.31 kg/s-m2 and 523.97 kg/s-m2, and inlet temperatures in the range of 60 °C and 80 °C. Thus, the friction factor of different regions of the boiler were estimated using both CFD simulations, experimental data, and bibliographic correlations. Simulations of operating points and the results of the experimental test bench showed good agreement in pressure drop results, with a mean absolute error of 15.47%, without a significant increment in the computational cost.

show abstract

A numerical investigation of subcooled flow boiling heat transfer in twisted elliptical tubes

Di,

Zhou,

Tao

et al. 2024

Annals of Nuclear Energy

View full text Add to dashboard Cite

New methodology for modeling pressure drop and thermal hydraulic characteristics in long vertical boiler tubes at high pressure

Cited by 5 publications

References 38 publications

Multiobjective Optimization of the Energy Efficiency and the Steam Flow in a Bagasse Boiler

Multiobjective Optimization of the Energy Efficiency and the Steam Flow in a Bagasse Boiler

Experimental Investigation and CFD Analysis of Pressure Drop in an ORC Boiler for a WHRS Implementation

A numerical investigation of subcooled flow boiling heat transfer in twisted elliptical tubes

Contact Info

Product

Resources

About