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학술대회자료
저자정보
저널정보
대한설비공학회 대한설비공학회 학술발표대회논문집 대한설비공학회 1995年度 동계학술발표 논문집
발행연도
1995.11
수록면
62 - 67 (6page)

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A movement to curtail chlorofluorocarbon (CFC) compounds began in 1987 with the signing of the Montreal Protocol, an international treaty that promised to reduce and ultimately ban the use of all CFCs. Studies have indicated that CFCs are the major suspect to the depletion of the upper atmosphere ozone layer which protects the earth from harmful radiation. Studies are being done to replace conventional refrigerants with alternatives that have no ozone depletion nor greenhouse warming potential, yet possess appropriate thermodynamic properties for a refrigeration cycle.
Ammonia has been used as refrigerant for more than 100 years in absorption as well as compression systems. Due to its poisonous and inflammable properties, however, its use has been mainly on heavy industrial plant in which regular maintenance is available. For these systems, condensers are generally water-cooled. This is suitable for large capacities over 20 RT but is not suitable for small capacities. In order to design a small capacity system, especially for household applications, it is important to design a condenser that is air-cooled.
In this study, an air-cooled condenser for an ammonia refrigeration system is studied. The condenser is designed as horizontal tubes with plate type fins attached at the outer surface to enhance the air-side heat transfer coefficient. Effects of fin shape and arrangement are studied. Since the local heat transfer coefficient is highest at the leading edge, the heat flux is highest at the edge and decreases as the distance increases. Conditions of inlet air are also varied in the study. Condenser length that is required for full condensation is calculated. The results show that it is important to enhance both the air-side and internal heat transfer coefficients.

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