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dc.contributorJau-Huai Luen_US
dc.contributor.authorDuong Ngoc Bichen_US
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dc.description.abstractOne of the excellent methods employed not only to recover waste heat from combustion furnaces is using regenerative heat exchanger that can help facilities significantly reduce fossil fuel consumption, as well as reduce associated operating costs, but also to control the Volatile Organic Compounds (VOCs) that consists of different kinds of chemical being adverse environment and health effects. The purpose of this study is to investigate the effects of operating and design parameters, two crucial variables in thermal performance of regenerative heat exchanger with two alternative working beds, on the efficiency of thermal exchange and the pressure drop through heating and cooling process. It is clearly that an extensive knowledge and thorough understanding of the heat transfer phenomena in the regenerator is essential. This study used numerical and analytical methods to simulate heat transfer process of regenerator brought out expected results for the temperatures of gases and solid material as function of time and space presented for the general asymmetric and unbalanced case. In particular, the thermal recovery efficiency is affected by the operating parameters as cycle duration (2% difference in each concerned semi-cycle duration), specific mass flow rate G (approximately 7% difference of the thermal effectiveness between G =1 and G =0.25 kg.m-2.s-1). On the other hand, it is investigated that design parameters also influenced on regenerator performance such as ball size (thermal recovery efficiency is higher 97% for balls with diameter of 6mm and lower 95% for that of 15mm), bed height (about 2% disparity of thermal effectiveness of 0.8m, 1m, 1.5m, and 2m height of regenerator), bed void-age (about 4% disparity of thermal efficiency between 44% and 64% in porosity). These listed parameters also impact considerably to the pressure drop, namely the increase the ball size reduces the pressure drop whereas the decrease the specific mass flow rate enlarges the pressure drop of whole furnace. Moreover, comparison the capacity of thermal recovery of a uniform particle and that of a non-uniform particle as well as the similarity of thermal storage performance between the modified radius of non-uniform particle and the uniform are also illustrated in this paper. Last but not least, the comparison of real regenerator as a waste heat recovery device of real model (regenerative furnaces in a glass factory) to the simulation model for fixed bed will bring us the deep and clear overview to thermal distribution of regenerator about the thermal recovery efficiency.en_US
dc.description.tableofcontentsAcknowledgement i Abstract ii Table of contents iv List of Figures vii Nomenclature x Chapter 1 Introduction 1 1.1. Scope and Significance 1 1.2.Survey of literatures 2 1.3. Objectives 12 Chapter 2 Mathermatical Model 14 2.1. Regenerator of random packing bed with ceramic balls inserted 14 2.1.1. Cooling process 17 2.1.2. Heating process 19 2.1.3. Numerical method for Regenerators with long length 20 2.2. Energy balance in cyclically heating and cooling of a sphere 21 2. 2.1. Regenerator model with uniform temperature of inserted balls 21 2. 2.2. Regenerator model with non-uniform temperature of inserted ball 25 2.3. Convective heat transfer coefficient 27 2.4. Determine initial parameters 27 2.4.1. Initial parameters for random packed bed 27 2.4.2. Initial parameters for fixed packed bed 29 Chapter 3 Heat transfer characteristics of random packed regenerator 30 3.1. Heat transfer performance of bed with small balls inserted 30 3.1.1. Heat transfer characteristic in cooling and heating process 31 3.1.2. Heat transfer characteristics at convergent condition 34 3.1.3. Effects of operating and design parameters in heat transfer performance of regenerator 30 Definition of thermal energy recovery 36 Effect of operating parameters 38 Effect of design parameters 40 3.1.4. Effect of operating and design parameters on pressure drop 45 3.2. Cyclically heating and cooling of a sphere for thermal recovery 48 3.2.1. Heat transfer characteristics inside a sphere 48 3.2.2. Heat transfer characteristics inside a sphere with modified radius 50 3.2.3. Thermal storage efficiency inside a sphere 52 Chapter 4 Heat transfer characteristics of fixed bed regenerator 55 4.1. Basic performance requirements of regenerative furnace 55 4.2. Physical properties of regenerator 57 4.3. Simulation of heat transfer characteristics of fixed bed 61 4.3.1. Unbalance flow in heating and cooling process 61 4.3.2. Simulation results 62 4.4. Temperature measurement of glass furnace regenerator 65 4.4.1. Temperature measurement in heating period 65 4.4.2. Temperature measurement in cooling period 66 4.5. Comparison the simulation results and the real experiment of fixed bed regenerator 67 4.5.1. Comparison in heat transfer characteristics 67 4.5.2 Comparison in thermal recovery efficiency 70 Chapter 5 Conclusions 71 References 73 References 73 Appendix 76 Appendix 1 Matlab code for heat transfer characteristics of random packed regenerator 76 Appendix 2 Matlab code for temperature variation inside a big ball in heating and cooling process 81 Appendix 3 Matlab code for heat transfer characteristics of fixed bed regenerator 85zh_TW
dc.subjectenergy recoveryen_US
dc.subjectheating processen_US
dc.subjectcooling processen_US
dc.subjectenergy efficiencyen_US
dc.titleNumerical investigations of heat transfer characteristics on regenerator for waste heat recovery systemen_US
dc.typeThesis and Dissertationen_US
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