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논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2004.10
- 수록면
- 823 - 830 (8page)
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Refrigerating systems in chemical processing industry have been used for (1) gas separation and liquefaction (2) solidification for separation of necessary matters from compounds (3) maintenance to prevent excessive pressure of refrigeration fluid and (4) drying or removal of reaction heat.
There is a wide variety of refrigerants that can be applied for refrigeration, but for HCFC refrigerants, restrictions are imposed on their production and use because they are classified as materials that are harmful to earth environment. As alternatives for HCFC refrigerants, HFC refrigerants have been marketed, but they have some problems such as low heat transfer rate and difficulty in selection of refrigerating oil and materials. In particular, they have high Global Warming Potential (GWP) and are not environmental, which causes such problem as selection of refrigerants.
However, natural gases such as ammonia as an organic compound, propane and propylene as hydrocarbon are easy and cheap to obtain as well as environmental. In particular, as ammonia can be effectively applied at wide range of temperatures, it has been widely used for chemical processing and it is guessed that it will be preferred in the future.
For ammonia refrigerating system, flooded evaporators are usually used and there are two types of the flooded evaporators that are commonly used as follows: a chiller method and a direct refrigeration; for the one, brine is refrigerated using evaporating latent heat generated when refrigerating fluid is charged in a heat exchanger; and for the other, refrigerating fluid is charged inside and outside the reactor. However, for the flooded evaporator, because external conditions while operating are changing, much wave of refrigerant fluid inside the evaporator is found. And because it is very difficult to judge status change in vapors of refrigerants incoming into a compressor, operation may be ineffective and abnormal, which causes serious loss of energy and increase in operation expenses.
Therefore, this study conducted a performance experiment on superheat temperature according to compressed pressures using a Shell & Tube Type compressor and a flooded evaporator to identify operation expenses and energy saving.
There is a wide variety of refrigerants that can be applied for refrigeration, but for HCFC refrigerants, restrictions are imposed on their production and use because they are classified as materials that are harmful to earth environment. As alternatives for HCFC refrigerants, HFC refrigerants have been marketed, but they have some problems such as low heat transfer rate and difficulty in selection of refrigerating oil and materials. In particular, they have high Global Warming Potential (GWP) and are not environmental, which causes such problem as selection of refrigerants.
However, natural gases such as ammonia as an organic compound, propane and propylene as hydrocarbon are easy and cheap to obtain as well as environmental. In particular, as ammonia can be effectively applied at wide range of temperatures, it has been widely used for chemical processing and it is guessed that it will be preferred in the future.
For ammonia refrigerating system, flooded evaporators are usually used and there are two types of the flooded evaporators that are commonly used as follows: a chiller method and a direct refrigeration; for the one, brine is refrigerated using evaporating latent heat generated when refrigerating fluid is charged in a heat exchanger; and for the other, refrigerating fluid is charged inside and outside the reactor. However, for the flooded evaporator, because external conditions while operating are changing, much wave of refrigerant fluid inside the evaporator is found. And because it is very difficult to judge status change in vapors of refrigerants incoming into a compressor, operation may be ineffective and abnormal, which causes serious loss of energy and increase in operation expenses.
Therefore, this study conducted a performance experiment on superheat temperature according to compressed pressures using a Shell & Tube Type compressor and a flooded evaporator to identify operation expenses and energy saving.
목차
Nomenclature
Abstract
1. Experimental Equipment and Procedure
2. Results and Discussions
3. Conclusion
References
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