한국해양대학교

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Numerical and Experimental Analysis on the Water Harvester using Peltier Effect

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dc.contributor.advisor 정형호 -
dc.contributor.author ANWUR H A F ALENEZI -
dc.date.accessioned 2020-07-20T11:44:17Z -
dc.date.available 2020-07-20T11:44:17Z -
dc.date.issued 2019 -
dc.identifier.uri http://repository.kmou.ac.kr/handle/2014.oak/12253 -
dc.identifier.uri http://kmou.dcollection.net/common/orgView/200000216847 -
dc.description.abstract Condensation of water vapor from humid air is a promising technique to produce water for drinking, cleaning, and other purposes. Several techniques can be used to cool hot and humid air and obtain water from it. For this purpose, Water Harvester is proposed in this study. The process of humid air condensation in this study depends on the performance of experimental and numerical analyses of the fluid flow and condensation performance. The experimental was performed in different operation conditions of working time, air temperature, and relative humidity. The condensation starts and sustains as the surface temperature maintains less than the dew-point temperature. As the relative humidity (RH) of air increased, the amount of condensed water also increased. There is a proportional relation between the condensation rates and the temperature difference. There is also a proportional relation between the cooling surface and air temperatures. It was found that the amount of heat rejected by the system increased as the condensation rate increased. As more heat was rejected, more water vapor was cooled and converted to water. Numerical predictions of the mass fraction of water and air on the cooling surface and condensation rate were performed. Before conducting these analyses, a 3D model of a condensation system to obtain water vapor from humid air through a thermoelectric cooler was built using SolidWorks software and then tested with ANSYS software. The obtained results of numerical analyses showed that the maximum value of the water fraction over the surface was measured as 98.7%, which indicates that 98.7% of the surface was wet. However, the maximum mass fraction of air was measured as only 1.4%. The Sherwood and Reynolds numbers are linearly related; as one increases, so does the other. Good agreement among the two analytical methods was observed during a comparison. Moreover, there was also good agreement between these results and those found in a literature review. -
dc.description.tableofcontents Table of Content I List of Figures IV List of Tables VII Abstract VIII NOMENCLATURE X ABBREVIATIONS XII Chapter 1 . Introduction 1 1.1 Background 1 1.2 Atmospheric air 2 1.3 Climate Analysis 3 1.4 Research Importance 4 1.5 Aims and objectives 6 1.6 Research outline 6 Chapter 2 . Literature Review 8 2.1 Techniques for water extraction from air 8 2.2 Water vapor condensation 9 2.3 Modelling of water vapor condensation 20 2.4 Critical analyses 29 Chapter 3 . Methodology 31 3.1 Overview 31 3.2 Theoretical calculations of fins 31 3.2.1 Nondimensional parameters 33 3.3 Governing equations of fluid motion 39 3.3.1 Conservation of mass 40 3.3.2 Momentum and energy conservation 43 3.3.3 Other equations 44 3.3.4 Summary of governing equations 46 3.3.5 Turbulence modelling (k-ε) 48 3.4 Experimental analysis 51 3.4.1 Experimental apparatus 51 3.5 Experimental conditions 53 3.5.1 Condition 1: Actual condition 53 3.5.2 Condition 2: Controlled condition 53 3.5.3 Data collection 53 Chapter 4 . Experimental analysis and results 56 4.1 Actual conditions results 56 4.2 Controlled condition 63 4.3 New concept 65 Chapter 5 . Numerical analysis and results 68 5.1 Overview 68 5.2 Model preparation 68 5.3 Basic assumptions for numerical model 69 5.3.1 Model analysis 70 5.3.2 Numerical modeling results 72 5.3.3 Results for testing conditions 73 5.4 Discussion 76 Chapter 6 . Conclusion 81 Acknowledgment 84 References 85 A.1 Theoretical Calculations for fins (dry conditions) 90 A.2 Theoretical calculations for fins (wet conditions) 92 A.3 Theoretical calculation for condensation 95 A.4: Results of theoretical model 102 A.5: Theoretical analysis for fins 103 A.6: Theoretical calculation for condensation 107 B.1: Materials selection 122 B.2: Selected material properties 131 Appendix C: Psychrometric chart 133 -
dc.language eng -
dc.publisher 한국해양대학교 대학원 -
dc.rights 한국해양대학교 논문은 저작권에 의해 보호받습니다. -
dc.title Numerical and Experimental Analysis on the Water Harvester using Peltier Effect -
dc.type Dissertation -
dc.date.awarded 2019-08 -
dc.contributor.department 대학원 기계공학과 -
dc.description.degree Doctor -
dc.identifier.bibliographicCitation ANWUR H A F ALENEZI. (2019). Numerical and Experimental Analysis on the Water Harvester using Peltier Effect. , (), -. -
dc.title.translated Numerical and Experimental Analysis on the Water Harvester using Peltier Effect -
dc.identifier.holdings 000000001979▲200000001277▲200000216847▲ -
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