MIT-World Peace University (MIT-WPU) is a top educational institute located in Pune, India. It is recognized within&nbsp;UGC under Government of Maharashtra Act No. XXXV 2017.&nbsp;

It is part of the MIT group of institutions (established in 1983) which covers 10+ campuses across India and has more than 50,000+ students enrolled across various disciplines at a given point of time. The institute houses 15 schools ranging from Engineering &amp; Technology, Design, Pharmacy, Commerce, Governance among others. It offers undergraduate, postgraduate and PhD programs among different disciplines.&nbsp;

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MIT World Peace University

Mathematical modeling of a helical coil thermal oil heater is difficult due to the complex heat transfer interaction between thermal oil and flue gas. The present publication reports the development of a transient model for the study of transient and steady-state behavior of fired helical coil thermal oil heaters. The mathematical model aims to predict the distribution of the flue gas temperature, thermal oil temperature, and tube wall temperature. A model is used for the accurate prediction of flame temperature and tube wall temperature. Prediction and control of the tube wall temperature are critical for the design and operation of a fired thermal oil heater. © 2022, Begell House Inc. All rights reserved.

World University root node

School of Mechanical Engineering

Engineering and Technology

Computational Thermal Sciences

TRANSIENT MODELING OF A FIRED HELICAL COIL THERMAL OIL HEATER

The paper presents a generalized approach for the flow distribution analysis of a natural circulation boiler. The model uses the combination of node and loop equations and the Newton Raphson technique for the solution of the set of equations. Loop equations have been developed for each evaporator tube with the unique driving force and pressure drop of the concerned loop. Node equations are mainly developed for common risers and downcomers. A unique connectivity matrix has been used to correlate each branch flow with loop and node equations. The model is validated by a unique indirect method by comparing the actual water level and calculated water level. The model shows good agreement with experimental data with a maximum of 4% absolute error. The model can be used for the design, analysis, and optimization of the natural circulation network.

Computational Thermal Sciences: An International Journal

Steady-State Flow Distribution Analysis of Natural Circulation in Water Tube Boiler

The basic objective of the paper is to identify the desired circulation ratio for the natural circulation of water tube boilers in different operating conditions. This requires the basic study of heat flux and the mode of the boiling heat transfer, and the phenomenon like departure from nucleate boiling and tube overheating. The parameters, which need to be studied are heat flux, pressure, dryness fraction, void fraction, liquid velocity and their impact on the required circulation ratio. For a natural circulation boiler, the circulation ratio is one of the most important design parameters as the other design parameter like critical heat flux and skin temperature are mainly derived from the circulation ratio. The required circulation ratio can vary with the boiler pressure, liquid velocity and maximum heat flux. This study is intended to provide input for the safe and optimum design of a natural circulation boiler.

Fulltext

Journal of Physics: Conference Series

Study of circulation ratio for natural circulation in water-tube boiler at different operating conditions.

The basic objective of the paper is to identify thedesired circulation ratio for the natural circulation of water tubeboilers in different operating conditions. This requires the basicstudy of heat flux and the mode of the boiling heat transfer, andthe phenomenon like a departure from nucleate boiling and tubeoverheating. The parameters, which need to be studied are heatflux, pressure, dryness fraction, void fraction, liquid velocity andtheir impact on the required circulation ratio. The present work isto develop a circulation analysis model for the natural circulationof the water tube boiler and to check the boiler design for differentfailure modes. For a natural circulation boiler, the circulationratio is one of the most important design parameters as the otherdesign parameter like critical heat flux and skin temperature aremainly derived from the circulation ratio. The requiredcirculation ratio can vary with the boiler pressure, liquid velocityand maximum heat flux. This study is intended to provide inputfor the safe and optimum design of a natural circulation boiler.

International Journal of Recent Technology and Engineering (IJRTE)

Desired Circulation Ratio for Natural Circulation in Water-Tube Boiler

In this present works, a generalized approach for the two-phase flow analysis of a natural circulation in hybrid boiler. The model uses the combination of node and loop equations and the Newton Raphson technique for the solution of the set of equations. Loop equations have been developed for each evaporator tube with the unique driving force and pressure drop of the concerned loop. Node equations are mainly developed for common risers and downcomers. A unique connectivity matrix has been used to correlate each branch flow with loop and node equations. The model is validated by a unique indirect method by comparing the actual water level and calculated water level. Experiments have been performed with uniform diameter of tubes in 53 channels circulating loop to find the volume of steam. The model shows good agreement with experimental investigations with a maximum of 3.57% absolute error. The model can be used for the design, analysis, and optimization of the natural circulation network. © 2020 International Information and Engineering Technology Association. All rights reserved.