디젤 발전기 폐열 및 태양열원 복합형 해수담수기 열 해석에 관한 연구

다국어 초록 (Multilingual Abstract)

Increasing water consumption by rapid industrialization, population growth, and water pollution lead to the problem of water shortages. And the problem is becoming critical. The demands for limited fresh water are increasing rapidly by population growth, industrial development and improved quality of life. In these situations, distilling abundant amounts of seawater is the best way to expand the water supply.
Meanwhile, it is an important issue to secure clean drinking water in areas like islands, remote and underdeveloped countries due to the lack of waterworks and electricity facilities. However, because these areas do not have enough social infrastructure, constructing and operating large-scale desalination facilities are not easy due to lack of costs and human resource for the initial construction, operating and maintenance. Thus, it is needed to develop small desalination unit useful in these area. As distilling technologies for small desalination unit, vapor compression, reverse osmosis concentration and solar-assisted methods are being considered. But vapor compression method and osmosis membranes have some problems of securing energy sources and maintenance like replacing filter, so given the situation of islands and long-term perspective, they are not good method to apply. In case of solar-assisted desalination technology, while the technology has the advantage of infinite energy source and ease of maintenance, it has disadvantage of low distillate production per unit area caused by its low energy density and temporal discrepancies with the consume. But its disadvantage can be supplemented by waste heat from diesel generator which has purpose of generating emergency power at islands and remote local.
In this study, when waste heat from diesel generator applied to solar still proposed by H. Tanaka in previous study, its distillate production rate was predicted by numerical analysis. In addition, considering the physical properties of wick in multi-effect part, the numerical accuracy has been increased. For this, mathematical model was established and then, applied to the numerical analysis based on the energy and mass balance equations. To verify the reliability of numerical analysis, the results was compared with those of previous study. Finally, by using the numerical model obtained the reliability, it was predicted to its distillate production according to seasons, design variables and operating conditions of heat recovery pipe.

목차 (Table of Contents)

• 제 1 장 서 론 1
• 1.1 연구배경 1
• 1.2 연구동향 4
• 1.3 연구목적 및 내용 5
• 제 2 장 이론적 배경 7
• 2.1 해석대상 7
• 2.2 에너지 및 물질 보존 방정식 9
• 2.3 열전달 모델 16
• 2.4 수치해석 방법 23
• 제 3 장 해석모델 검증 25
• 3.1 해석조건 설정 25
• 3.2 수치해석 결과비교 28
• 제 4 장 수치해석 결과 35
• 4.1 해석조건 및 변수 설정 35
• 4.2 계절의 영향 37
• 4.3 담수부 효용단 수와 간격의 영향 46
• 4.4 유리 덮개 경사각의 영향 49
• 4.5 해수조 수면 높이의 영향 52
• 4.6 열 회수관 내의 체적유량의 영향 55
• 4.4 폐열 기체 유입온도의 영향 58
• 제 5 장 결 론 61
• Reference 63